Pub Date : 2023-03-31DOI: 10.4491/ksee.2023.45.3.161
The world is gripped with a sense of crisis over the disasters caused by rapid climate change. Various policy and technical attempts are being made to reduce carbon emissions around the world. Since the issue of RE100 was raised in the last presidential debate, interest in RE100 has been increasing. RE100 is a voluntary campaign to cover corporate power with 100% renewable electricity, and is attracting more attention in line with the company's sustainable management policy. In this review, the reality of RE100 and related policies were investigated. Based on this, the institutional direction for the realization of RE100 was presented.
{"title":"RE100 for 100% Renewable Electricity: Status and Prospects","authors":"","doi":"10.4491/ksee.2023.45.3.161","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.3.161","url":null,"abstract":"The world is gripped with a sense of crisis over the disasters caused by rapid climate change. Various policy and technical attempts are being made to reduce carbon emissions around the world. Since the issue of RE100 was raised in the last presidential debate, interest in RE100 has been increasing. RE100 is a voluntary campaign to cover corporate power with 100% renewable electricity, and is attracting more attention in line with the company's sustainable management policy. In this review, the reality of RE100 and related policies were investigated. Based on this, the institutional direction for the realization of RE100 was presented.","PeriodicalId":52756,"journal":{"name":"daehanhwangyeonggonghaghoeji","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43190271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-28DOI: 10.4491/ksee.2023.45.2.90
S. Jeong
Objectives : The greenhouse gas (GHG) emissions of coal, natural gas, wind, solar, hydropower, and nuclear electricity generation mentioned in the United Nations Economic Commission for Europe (UNECE) LCA report were discussed. Korean GHG emissions were calculated from the electricity database (DB) of the Korean national life cycle inventory (LCI), compared with the international average, and then discussed. The aim of this study was to discuss the necessity of updating and internationalizing the national LCI DB.Methods : The GHG emissions from the generation of coal power, natural gas power, wind power, onshore wind power, solar power, and hydropower in the UNECE LCA study were analyzed, and climate change, that is, GHG emissions, among the environmental impact assessment categories was discussed. The GHG emissions per 1 kWh functional unit were calculated from the electricity DB of the Korean national LCI by applying the global warming potential to GHGs.Results and Discussion : The GHG emissions from natural gas (452 g CO2-eq./kWh), nuclear (6.3 g CO2-eq./kWh), and solar power generation (53 g CO2-eq./kWh) presented in the national LCI DB were within the range of results presented in the UNECE LCA report. However, GHG emissions of Korean coal power generation exceeded the UNECE average and highest ranges. The GHG emissions of Korean hard coal and bituminous power generation were 1,351 g CO2-eq./kWh and 1,160 g CO2-eq./kWh, respectively, which were higher than the highest UNECE value, 1,095 g CO2 eq./kWh (China). Analysis of the Korean electricity LCI DB for coal power plants showed that bituminous coal-fired power plants that use more brown coal, which is known to be relatively low-quality coal, produce less CO2 than anthracite coal power plants. In Korean coal-fired power plants, it is necessary to check whether CO2 generated from processes other than the combustion process is significant.Conclusion : Electricity accounts for the largest portion when calculating national greenhouse gas emissions, therefore, accurate data is necessary. Korea, which is highly dependent on coal-fired power generation for electricity production, should update its electricity LCI DB as soon as possible to increase national competitiveness and use it as a basis for realizing carbon neutrality by 2050.
目标：讨论了联合国欧洲经济委员会（UNECE）LCA报告中提到的煤炭、天然气、风能、太阳能、水电和核能发电的温室气体排放。根据韩国国家生命周期清单（LCI）的电力数据库（DB）计算韩国GHG排放量，并与国际平均值进行比较，然后进行讨论。本研究的目的是讨论更新和国际化国家LCI DB的必要性。方法：分析UNECE LCA研究中燃煤发电、天然气发电、风力发电、陆上风电、太阳能发电和水电发电的GHG排放，并讨论环境影响评估类别中的气候变化，即GHG排放。通过将全球变暖潜力应用于温室气体，从韩国国家LCI的电力DB中计算出每1 kWh功能单元的GHG排放量。结果和讨论：天然气（452 g CO2当量/kWh）、核能（6.3 g CO2当量/kWh）、，以及国家LCI DB中提出的太阳能发电量（53 g CO2当量/kWh）在UNECE LCA报告中提出的结果范围内。然而，韩国燃煤发电的GHG排放量超过了UNECE的平均值和最高范围。韩国硬煤和沥青发电的温室气体排放量为1351克二氧化碳当量/kWh和1160克二氧化碳当量/kWh，高于UNECE最高值1095 g二氧化碳当量/kWh（中国）。对韩国电力LCI燃煤发电厂DB的分析表明，使用更多褐煤（众所周知，褐煤质量相对较低）的烟煤发电厂比无烟煤发电厂产生的二氧化碳更少。在韩国燃煤发电厂，有必要检查燃烧过程以外的过程产生的二氧化碳是否显著。结论：在计算全国温室气体排放量时，电力占了最大的比例，因此，准确的数据是必要的。电力生产高度依赖燃煤发电的韩国应尽快更新其电力LCI DB，以提高国家竞争力，并将其作为到2050年实现碳中和的基础。
{"title":"Discussion on the Life Cycle of Greenhouse Gas Emissions from the 2021 UNECE LCA Report and Korean LCI DB for Electricity Generation","authors":"S. Jeong","doi":"10.4491/ksee.2023.45.2.90","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.2.90","url":null,"abstract":"Objectives : The greenhouse gas (GHG) emissions of coal, natural gas, wind, solar, hydropower, and nuclear electricity generation mentioned in the United Nations Economic Commission for Europe (UNECE) LCA report were discussed. Korean GHG emissions were calculated from the electricity database (DB) of the Korean national life cycle inventory (LCI), compared with the international average, and then discussed. The aim of this study was to discuss the necessity of updating and internationalizing the national LCI DB.Methods : The GHG emissions from the generation of coal power, natural gas power, wind power, onshore wind power, solar power, and hydropower in the UNECE LCA study were analyzed, and climate change, that is, GHG emissions, among the environmental impact assessment categories was discussed. The GHG emissions per 1 kWh functional unit were calculated from the electricity DB of the Korean national LCI by applying the global warming potential to GHGs.Results and Discussion : The GHG emissions from natural gas (452 g CO2-eq./kWh), nuclear (6.3 g CO2-eq./kWh), and solar power generation (53 g CO2-eq./kWh) presented in the national LCI DB were within the range of results presented in the UNECE LCA report. However, GHG emissions of Korean coal power generation exceeded the UNECE average and highest ranges. The GHG emissions of Korean hard coal and bituminous power generation were 1,351 g CO2-eq./kWh and 1,160 g CO2-eq./kWh, respectively, which were higher than the highest UNECE value, 1,095 g CO2 eq./kWh (China). Analysis of the Korean electricity LCI DB for coal power plants showed that bituminous coal-fired power plants that use more brown coal, which is known to be relatively low-quality coal, produce less CO2 than anthracite coal power plants. In Korean coal-fired power plants, it is necessary to check whether CO2 generated from processes other than the combustion process is significant.Conclusion : Electricity accounts for the largest portion when calculating national greenhouse gas emissions, therefore, accurate data is necessary. Korea, which is highly dependent on coal-fired power generation for electricity production, should update its electricity LCI DB as soon as possible to increase national competitiveness and use it as a basis for realizing carbon neutrality by 2050.","PeriodicalId":52756,"journal":{"name":"daehanhwangyeonggonghaghoeji","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47130635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-28DOI: 10.4491/ksee.2023.45.2.107
Hajeong Kim, Gayeon Yang, Chaerim Nam, Se-Hun Jeong, Sokhee P. Jung
Globally, interest in renewable energy and related industries are rapidly increasing in recent years. In solar power generation, almost unlimited energy resources can be supplied as long as the sun does not disappear, and carbon dioxide is not generated when looking at the power generation process itself. However, photovoltaic power generation faces several fundamental problems such as low economic feasibility, disposal of waste panels, environmental destruction due to installation, and generation of harmful substances in the production process. In this review, the current status of photovoltaic power generation is reviewed and, based on this, the direction for Korea's photovoltaic policy is suggested. 1) In order to overcome low economic feasibility, large-scale power generation projects should be promoted to achieve economies of scale. 2) Existing buildings or spaces must be utilized to prevent forest damage from photovoltaic power generation. 3) Active support and investment from the state and companies are needed to develop eco-friendly technologies for reducing hazardous substances and recycling waste panels. 4) An institutional system for information disclosure and management of harmful substances for solar energy projects should be established.
{"title":"Solar Photovoltaic Industry in Korea: Current Status and Perspectives","authors":"Hajeong Kim, Gayeon Yang, Chaerim Nam, Se-Hun Jeong, Sokhee P. Jung","doi":"10.4491/ksee.2023.45.2.107","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.2.107","url":null,"abstract":"Globally, interest in renewable energy and related industries are rapidly increasing in recent years. In solar power generation, almost unlimited energy resources can be supplied as long as the sun does not disappear, and carbon dioxide is not generated when looking at the power generation process itself. However, photovoltaic power generation faces several fundamental problems such as low economic feasibility, disposal of waste panels, environmental destruction due to installation, and generation of harmful substances in the production process. In this review, the current status of photovoltaic power generation is reviewed and, based on this, the direction for Korea's photovoltaic policy is suggested. 1) In order to overcome low economic feasibility, large-scale power generation projects should be promoted to achieve economies of scale. 2) Existing buildings or spaces must be utilized to prevent forest damage from photovoltaic power generation. 3) Active support and investment from the state and companies are needed to develop eco-friendly technologies for reducing hazardous substances and recycling waste panels. 4) An institutional system for information disclosure and management of harmful substances for solar energy projects should be established.","PeriodicalId":52756,"journal":{"name":"daehanhwangyeonggonghaghoeji","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46807748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-28DOI: 10.4491/ksee.2023.45.2.81
Do-jung Lim, Mi-Jin Choi, Jongkwan Park
Objectives : It provides a detailed procedure for analyzing dissolved organic matter (DOM) by the PARAFAC technique and aims to identify compare different fluorescent components of DOM with various water sources.Methods : PARAFAC modeling was performed based on the PARAFAC tutorial by Stedmon et al. [11] using a total of 160 samples originated from wetlands, river, wastewater treatment plant influent and effluent. The procedure includes data preprocessing, initial model creation, outlier analysis, split-half analysis, core consistency, and sum of squared error analysis (SSE). After finishing the model validation step, the samples were analyzed through the verified PARAFAC model.Results and Discussion : An initial model with 2 to 4 components was created, and as a result of outlier analysis, the four WWTP Influent samples were removed as outliers. As a result of SSE analysis, the model with two components has a relatively higher SSE value than the model with three or four components. In the case of core consistency, the model with 2, 3, and 4 components scored 99.6%, 94.9%, and 65.7%, respectively. As a result of the split-half analysis, the spectra of the model having the three components of the split data were the same, so it was finally determined that the number of three components was appropriate in the model. The DOM samples were analyzed by the developed PARAFAC model. It was confirmed that the ratio of humic components was higher in the order of WWTP effluent ≈ wetland > river > WWTP influent, and the ratio of protein components affected by microbial activity was in the order of WWTP influent > river > wetland ≈ WWTP effluent.Conclusion : In this paper, the procedure of PARAFAC modeling was described and the DOM fluorescence properties were compared. This research provides a practical method for increasing the utilization of the PARAFAC model in the water treatment research field. In addition, the result of the PARAFAC model is useful data to control DOM efficiently in water treatment facilities.
{"title":"Application of PARAFAC Technique to Compare Fluorescence Property of Different Dissolved Organic Matters","authors":"Do-jung Lim, Mi-Jin Choi, Jongkwan Park","doi":"10.4491/ksee.2023.45.2.81","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.2.81","url":null,"abstract":"Objectives : It provides a detailed procedure for analyzing dissolved organic matter (DOM) by the PARAFAC technique and aims to identify compare different fluorescent components of DOM with various water sources.Methods : PARAFAC modeling was performed based on the PARAFAC tutorial by Stedmon et al. [11] using a total of 160 samples originated from wetlands, river, wastewater treatment plant influent and effluent. The procedure includes data preprocessing, initial model creation, outlier analysis, split-half analysis, core consistency, and sum of squared error analysis (SSE). After finishing the model validation step, the samples were analyzed through the verified PARAFAC model.Results and Discussion : An initial model with 2 to 4 components was created, and as a result of outlier analysis, the four WWTP Influent samples were removed as outliers. As a result of SSE analysis, the model with two components has a relatively higher SSE value than the model with three or four components. In the case of core consistency, the model with 2, 3, and 4 components scored 99.6%, 94.9%, and 65.7%, respectively. As a result of the split-half analysis, the spectra of the model having the three components of the split data were the same, so it was finally determined that the number of three components was appropriate in the model. The DOM samples were analyzed by the developed PARAFAC model. It was confirmed that the ratio of humic components was higher in the order of WWTP effluent ≈ wetland > river > WWTP influent, and the ratio of protein components affected by microbial activity was in the order of WWTP influent > river > wetland ≈ WWTP effluent.Conclusion : In this paper, the procedure of PARAFAC modeling was described and the DOM fluorescence properties were compared. This research provides a practical method for increasing the utilization of the PARAFAC model in the water treatment research field. In addition, the result of the PARAFAC model is useful data to control DOM efficiently in water treatment facilities.","PeriodicalId":52756,"journal":{"name":"daehanhwangyeonggonghaghoeji","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70473928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-28DOI: 10.4491/ksee.2023.45.2.96
Dahye Son, kang-seog seo, Yun-Whan Kim, Junhyeoung Lee, Sokhee P. Jung
Korea consumes a large amount of energy. Korea is vulnerable to energy security due to its high dependence on energy imports. The amount of waste generated in South Korea is increasing every year. Recycling accounted for the highest proportion of waste disposal methods at 86.6%, but this was calculated based on the amount brought into recycling facilities. In fact, large amounts of waste are landfilled or incinerated. Landfilling and incineration of waste causes various environmental pollution problems. We need innovative and practical technologies that convert waste into energy and have less impact on the environment. Waste gasification technology is currently attracting attention because it emits less pollutants and can produce energy using waste as a raw material. In this review, we briefly summarized the principles and characteristics of the gasification process, and discussed the current status and limitations of waste gasification process equipment in Japan and overseas, and the direction that should be taken from the technical and institutional aspects.
{"title":"Organic Waste Resource Gasification: Current Status and Perspectives","authors":"Dahye Son, kang-seog seo, Yun-Whan Kim, Junhyeoung Lee, Sokhee P. Jung","doi":"10.4491/ksee.2023.45.2.96","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.2.96","url":null,"abstract":"Korea consumes a large amount of energy. Korea is vulnerable to energy security due to its high dependence on energy imports. The amount of waste generated in South Korea is increasing every year. Recycling accounted for the highest proportion of waste disposal methods at 86.6%, but this was calculated based on the amount brought into recycling facilities. In fact, large amounts of waste are landfilled or incinerated. Landfilling and incineration of waste causes various environmental pollution problems. We need innovative and practical technologies that convert waste into energy and have less impact on the environment. Waste gasification technology is currently attracting attention because it emits less pollutants and can produce energy using waste as a raw material. In this review, we briefly summarized the principles and characteristics of the gasification process, and discussed the current status and limitations of waste gasification process equipment in Japan and overseas, and the direction that should be taken from the technical and institutional aspects.","PeriodicalId":52756,"journal":{"name":"daehanhwangyeonggonghaghoeji","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48271757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-28DOI: 10.4491/ksee.2023.45.2.119
H. Shin, Jin Ho Kim
Objectives : Acid gases such as carbon dioxide (CO2) and hydrogen sulfide (H2S) that cause global warming are mainly generated in chemical processes. As a technology for reducing acid gas, the post-combustion capture process is representative. Aqueous alkanolamine solution, which is mainly used in the carbon dioxide absorption process, is used as the most representative chemical absorbent. Thermodynamic data of vapor-liquid equilibrium are important for the economics of process design and operation. In this study, vapor-liquid equilibrium data of water + DEA are measured so that DEA, a secondary amine, can be used in the carbon dioxide absorption process, so that it can be used for designing a new carbon dioxide absorption process.Methods : Vapor-liquid equilibrium data of a mixture of water + DEA (diethanolamine) were measured under isothermal conditions of 393.15 K using HSGC (Headspace Gas Chromatography).Results and Discussion : The measured vapor-liquid equilibrium data were correlated using NRTL, an activity coefficient model. In addition, as additional thermodynamic data of the absorbent mixture, the density of the DEA aqueous mixture was measured at a temperature of 303.15 K to 333.15 K using a density meter (Anton Paar DMA4500). The measured density data of the mixture was converted into excess volume, and the excess volume data was correlated using the Redilchi-Kister-Muggianu equation. Using the measured water+DEA vapor-liquid equilibrium data, it is expected to reducing the design cost and operating cost of the carbon dioxide absorption processes.
目的:导致全球变暖的酸性气体，如二氧化碳(CO2)和硫化氢(H2S)，主要是在化学过程中产生的。燃烧后捕集作为一种还原酸性气体的技术，具有代表性。醇胺水溶液是最具代表性的化学吸收剂，主要用于二氧化碳吸收过程。汽液平衡的热力学数据对工艺设计和运行的经济性具有重要意义。本研究通过测量水+ DEA的汽液平衡数据，将DEA这一仲胺应用于二氧化碳吸收过程，从而设计新的二氧化碳吸收工艺。方法:采用HSGC(顶空气相色谱法)在393.15 K等温条件下测定水+二乙醇胺混合物的气液平衡数据。结果与讨论:利用活度系数模型NRTL对测定的汽液平衡数据进行了相关性分析。此外，作为吸收剂混合物的附加热力学数据，在303.15 K至333.15 K的温度下，使用密度计(Anton Paar DMA4500)测量了DEA水溶液混合物的密度。将测得的混合物密度数据转化为过量体积数据，并利用Redilchi-Kister-Muggianu方程对过量体积数据进行关联。利用实测的水+DEA汽液平衡数据，有望降低二氧化碳吸收工艺的设计成本和运行成本。
{"title":"Vapor Liquid Equilibrium of Aqueous Diethanolamine Solution for Carbon Dioxide Capture Processes","authors":"H. Shin, Jin Ho Kim","doi":"10.4491/ksee.2023.45.2.119","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.2.119","url":null,"abstract":"Objectives : Acid gases such as carbon dioxide (CO2) and hydrogen sulfide (H2S) that cause global warming are mainly generated in chemical processes. As a technology for reducing acid gas, the post-combustion capture process is representative. Aqueous alkanolamine solution, which is mainly used in the carbon dioxide absorption process, is used as the most representative chemical absorbent. Thermodynamic data of vapor-liquid equilibrium are important for the economics of process design and operation. In this study, vapor-liquid equilibrium data of water + DEA are measured so that DEA, a secondary amine, can be used in the carbon dioxide absorption process, so that it can be used for designing a new carbon dioxide absorption process.Methods : Vapor-liquid equilibrium data of a mixture of water + DEA (diethanolamine) were measured under isothermal conditions of 393.15 K using HSGC (Headspace Gas Chromatography).Results and Discussion : The measured vapor-liquid equilibrium data were correlated using NRTL, an activity coefficient model. In addition, as additional thermodynamic data of the absorbent mixture, the density of the DEA aqueous mixture was measured at a temperature of 303.15 K to 333.15 K using a density meter (Anton Paar DMA4500). The measured density data of the mixture was converted into excess volume, and the excess volume data was correlated using the Redilchi-Kister-Muggianu equation. Using the measured water+DEA vapor-liquid equilibrium data, it is expected to reducing the design cost and operating cost of the carbon dioxide absorption processes.","PeriodicalId":52756,"journal":{"name":"daehanhwangyeonggonghaghoeji","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44068971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-28DOI: 10.4491/ksee.2023.45.2.65
Yong-Ho Choi, Yong-Hoon Jeong, H. T. Nguyen, S. Yoon, In-Gyong Yi, D. Kwak
Objectives : To identify and estimate the non-point source (NPS) pollution loads in the Yongdam watershed, and to take an appropriate NPS management plan suitable for the environmental conditions of the sub-basin of Yongdam watershed.Methods : The NPS pollutant loads of the Yongdam watershed was investigated to establish the hydrological simulation program-fortran (HSPF) model for the study area so that the characteristics of non-point runoff were simulated. Furthermore, the detailed catchment area subject to non-point pollution management was selected and the effect of reducing non-point pollution was examined based on the various simulation results.Results and Discussion : The three sub-basins, including specific component of catchments, of Yongdam watershed was selected according to the load intensity and distribution of NPS pollution. The result of analyzing the load flowing into the downstream by rainfall intensity revealed that the pollutant load accounted for 11.8~19.9% in the dry season, and for Jinan-cheon sub-basin the load was high in the range of 10~30 mm while Janggye-cheon sub-basin and downstream of Janggye-cheon junction sub-basin showed a high load in the range 30~60 mm. In addition, the load duration curve (LDC) showed the excess frequency of BOD load was high when the flow rate increased at the end of stream for each sub-basin, whereas the load excess frequency was high in T-P in the entire flow range. LDC analysis led to us that the water quality of stream was affected by point and non-point pollutants in a complex way. When the ground cover in a farm were installed by selecting 10 detailed catchments with high need for NPS pollution management, the reduction of T-P load was estimated to be reduced by 325.256~995.912 g/d in Jinan-cheon sub-basin, 1279.813~3327.513 g/d in Janggye-cheon sub-basin, and 1316.831~3555.443 g/d in downstream of Janggye-cheon junction sub-basin.Conclusion : Through various simulation experiments using the HSPF model, it was feasible to select an catchment subject to NPS pollution control in detail and evaluate the effect of reducing NPS pollution.
{"title":"Evaluation of Non-Point Source Pollution Load Characteristics and Identifying Management Sub-Basin Area and Best Management Practices Using HSPF Model in Yongdam Dam Watershed","authors":"Yong-Ho Choi, Yong-Hoon Jeong, H. T. Nguyen, S. Yoon, In-Gyong Yi, D. Kwak","doi":"10.4491/ksee.2023.45.2.65","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.2.65","url":null,"abstract":"Objectives : To identify and estimate the non-point source (NPS) pollution loads in the Yongdam watershed, and to take an appropriate NPS management plan suitable for the environmental conditions of the sub-basin of Yongdam watershed.Methods : The NPS pollutant loads of the Yongdam watershed was investigated to establish the hydrological simulation program-fortran (HSPF) model for the study area so that the characteristics of non-point runoff were simulated. Furthermore, the detailed catchment area subject to non-point pollution management was selected and the effect of reducing non-point pollution was examined based on the various simulation results.Results and Discussion : The three sub-basins, including specific component of catchments, of Yongdam watershed was selected according to the load intensity and distribution of NPS pollution. The result of analyzing the load flowing into the downstream by rainfall intensity revealed that the pollutant load accounted for 11.8~19.9% in the dry season, and for Jinan-cheon sub-basin the load was high in the range of 10~30 mm while Janggye-cheon sub-basin and downstream of Janggye-cheon junction sub-basin showed a high load in the range 30~60 mm. In addition, the load duration curve (LDC) showed the excess frequency of BOD load was high when the flow rate increased at the end of stream for each sub-basin, whereas the load excess frequency was high in T-P in the entire flow range. LDC analysis led to us that the water quality of stream was affected by point and non-point pollutants in a complex way. When the ground cover in a farm were installed by selecting 10 detailed catchments with high need for NPS pollution management, the reduction of T-P load was estimated to be reduced by 325.256~995.912 g/d in Jinan-cheon sub-basin, 1279.813~3327.513 g/d in Janggye-cheon sub-basin, and 1316.831~3555.443 g/d in downstream of Janggye-cheon junction sub-basin.Conclusion : Through various simulation experiments using the HSPF model, it was feasible to select an catchment subject to NPS pollution control in detail and evaluate the effect of reducing NPS pollution.","PeriodicalId":52756,"journal":{"name":"daehanhwangyeonggonghaghoeji","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42277246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-31DOI: 10.4491/ksee.2023.45.1.43
H. Oh, H. Rhee, S. Cho, Sang-Woo Lee, H. Hwang
Objectives:Since the enactment of the 「Han-River Watershed Act」, comprehensive analysis about direct and indirect contributions and effects of various environmental policies and water quality improvement projects for the preservation of water quality in the Han-River watershed is insufficient. Especially, effect of pollutant source location regulation should be inferred and estimated through model prediction because it does not exist unregulated conditions. As development pressure in non-urban areas near the metropolitan area is increasing, it is necessary to analyze the effects of pollutant source location regulation.Methods:In this study, average pollutant density of Gangwon-do, Gyeonggi-do, and Chungcheongbuk-do, where the regulation areas located, and average pollutant density of water source management areas were compared and analyzed. After that changes in pollutant sources in regulation areas were estimated by assuming load of pollutant sources in unregulated areas that load of pollutant sources in regulation areas. Since many reservoirs are located in Han-river watershed, it is difficult to simulate the water quality of Paldang reservoir using only watershed model, BASINS/WinHSPF and EFDC-WASP were linked. Through this, change in water quality of Paldang Lake was tried to predict when the pollutant location regulation was not implemented, and to analyze the effect of the pollutant location regulation.Results and Discussion:Water quality improvement of Paldang reservoir was evaluated by applying the discharge load when the pollution source location regulation was not implemented to the calibrated model. As a result of the pollution source location regulation, discharge load in the location regulation area was analyzed to reduce by 53.90% and T-P by 48.58%, and the BOD and T-P improvement effect of Paldang Dam was analyzed 6.77% and T-P 6.62%. Since the water quality improvement effect of Paldang Lake is accumulated to the entire upstream, it is evaluated relatively less than pollutant load reducing effect.Conclusion:It was analyzed that pollutiont source location regulation has water quality improvement effect, despite the small area which only located in near Paldang reservoir compared to the total area of the Han-River watershed.
{"title":"A Study on Paldang Reservoir Water Quality Improvement Effect by Pollutant Source Location Regulation Using Watershed-Reservoir Integrated Prediction","authors":"H. Oh, H. Rhee, S. Cho, Sang-Woo Lee, H. Hwang","doi":"10.4491/ksee.2023.45.1.43","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.1.43","url":null,"abstract":"Objectives:Since the enactment of the 「Han-River Watershed Act」, comprehensive analysis about direct and indirect contributions and effects of various environmental policies and water quality improvement projects for the preservation of water quality in the Han-River watershed is insufficient. Especially, effect of pollutant source location regulation should be inferred and estimated through model prediction because it does not exist unregulated conditions. As development pressure in non-urban areas near the metropolitan area is increasing, it is necessary to analyze the effects of pollutant source location regulation.Methods:In this study, average pollutant density of Gangwon-do, Gyeonggi-do, and Chungcheongbuk-do, where the regulation areas located, and average pollutant density of water source management areas were compared and analyzed. After that changes in pollutant sources in regulation areas were estimated by assuming load of pollutant sources in unregulated areas that load of pollutant sources in regulation areas. Since many reservoirs are located in Han-river watershed, it is difficult to simulate the water quality of Paldang reservoir using only watershed model, BASINS/WinHSPF and EFDC-WASP were linked. Through this, change in water quality of Paldang Lake was tried to predict when the pollutant location regulation was not implemented, and to analyze the effect of the pollutant location regulation.Results and Discussion:Water quality improvement of Paldang reservoir was evaluated by applying the discharge load when the pollution source location regulation was not implemented to the calibrated model. As a result of the pollution source location regulation, discharge load in the location regulation area was analyzed to reduce by 53.90% and T-P by 48.58%, and the BOD and T-P improvement effect of Paldang Dam was analyzed 6.77% and T-P 6.62%. Since the water quality improvement effect of Paldang Lake is accumulated to the entire upstream, it is evaluated relatively less than pollutant load reducing effect.Conclusion:It was analyzed that pollutiont source location regulation has water quality improvement effect, despite the small area which only located in near Paldang reservoir compared to the total area of the Han-River watershed.","PeriodicalId":52756,"journal":{"name":"daehanhwangyeonggonghaghoeji","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49658703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-31DOI: 10.4491/ksee.2023.45.1.34
Wuseong Jeong, JungJin Kim, Hanseok Jeong
Objectives:In this study, we seek to provide a thorough insight into how people perceive microplastics and uncover issues and hidden trends about the significant microplastic pollution problems by analyzing unstructured data on microplastics.Methods:Environmental news articles related to microplastics were collected. Text mining techniques including data pre-processing, word cloud, TF-IDF weight-based trend analysis, and LDA topic modeling were used to analyze the amount of textual data.Results and Discussion:The public's interest in microplastics is consistently growing, according to an analysis of all environmental news and the keyword ‘microplastic’ from 2014 to 2021 conducted via BIGKinds. The keyword 'trash' was the overwhelmingly enormous weight among words. The top 5 keywords connected to microplastics did not fade away and continued appearing even though the socially noticeable keywords during the study period varied yearly. This indicates that the primary issue with microplastics related to keywords has not yet been solved. Our study has a limitation of subject diversity because we only focused on microplastic news. The results, however, presented all processes from plastic pollution emergence to treatment, such as microplastic pollution sources, microplastic detection, and prevention methods against microplastics.Conclusion:Text mining analysis was performed on microplastics in environmental news and provided issues and trends on microplastic pollution. This study presents a new methodology for environmental and social problem analysis, suggesting that it could enable a multidimensional understanding of environmental problems and help establish environmental policies.
{"title":"Information Extraction from Unstructured Data on Microplastics through Text Mining","authors":"Wuseong Jeong, JungJin Kim, Hanseok Jeong","doi":"10.4491/ksee.2023.45.1.34","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.1.34","url":null,"abstract":"Objectives:In this study, we seek to provide a thorough insight into how people perceive microplastics and uncover issues and hidden trends about the significant microplastic pollution problems by analyzing unstructured data on microplastics.Methods:Environmental news articles related to microplastics were collected. Text mining techniques including data pre-processing, word cloud, TF-IDF weight-based trend analysis, and LDA topic modeling were used to analyze the amount of textual data.Results and Discussion:The public's interest in microplastics is consistently growing, according to an analysis of all environmental news and the keyword ‘microplastic’ from 2014 to 2021 conducted via BIGKinds. The keyword 'trash' was the overwhelmingly enormous weight among words. The top 5 keywords connected to microplastics did not fade away and continued appearing even though the socially noticeable keywords during the study period varied yearly. This indicates that the primary issue with microplastics related to keywords has not yet been solved. Our study has a limitation of subject diversity because we only focused on microplastic news. The results, however, presented all processes from plastic pollution emergence to treatment, such as microplastic pollution sources, microplastic detection, and prevention methods against microplastics.Conclusion:Text mining analysis was performed on microplastics in environmental news and provided issues and trends on microplastic pollution. This study presents a new methodology for environmental and social problem analysis, suggesting that it could enable a multidimensional understanding of environmental problems and help establish environmental policies.","PeriodicalId":52756,"journal":{"name":"daehanhwangyeonggonghaghoeji","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44845127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-31DOI: 10.4491/ksee.2023.45.1.51
Kyeongjin Kim, Jeong-Pyo Jeon, I. Yeom
Objectives:As the organic pollutant indicator is changed from CODMn to TOC and the demand for TOC treatment of industrial wastewater increasing, the current situation of TOC treatment of wastewater discharge facilities of each industrial category is analyzed, and it is intended to consider the possibility of residual TOC treatment by ozone and advanced oxidation process.Methods:To review the TOC treatment situations of wastewater discharge facilities of each industrial category, the field survey data (46 sites) by Environment Ministry and Korea Environment Corporation were analyzed according to inflow TOC concentrations, direct/indirect discharge type, and main treatment process of wastewater treatment facilities. To review the characteristics of TOC treatment by ozone and advanced oxidation processes, previous studies and the results of field pilot tests conducted by ozone companies were comprehensively analyzed.Results and Discussion:The TOC treatment level varies depending on the inflow TOC concentrations to each industrial wastewater treatment facility, direct/indirect discharge type depending on the location of the wastewater treatment facilities, and the main treatment process of the wastewater treatment facility. In particular, the TOC removal rate differed by more than 20% depending on the presence or absence of biological treatment. The wastewater treatment facilities that require additional treatment of residual TOC were divided as follows (1) when the facility has biological treatment as main process, increasing unexpected inflow TOC load in treatment facilities or the condition of the biological treatment become worsen. (2) when the facility has phy-chemical treatment as main process, increasing unexpected inflow TOC load. (3) extending the replacement cycle of activated carbon to save maintenance cost. The advance oxidation process decomposes easily by OH radicals through the radical substitution of unsaturated hydrocarbons and aromatic compounds, so the removal rate of TOC by the O3+H2O2 advanced oxidation pilot test was 14.7~93.5%, higher than that of ozone oxidation. The specific ozone consumption per TOC removal amount (O3/ΔTOC) by O3+H2O2 advanced oxidation is 8.5~22.5mgO3/mgTOC, which is 1/5 of that of ozone oxidation only. In addition, comparing ozone demand by CODMn and TOC removal, ozone demand of O3+H2O2 advanced oxidation to remove TOC is 2.7 to 4.3 times compared to that by O3 oxidation to remove CODMn.Conclusion:In order to reduce residual TOC from industrial wastewater effluent, it is necessary to secure stability of the existing main treatment process in preparation for load fluctuations, and the technologies research on complex advanced oxidation processes, hybrid advanced oxidation processes, and pretreatment technology to reduce ozone demand is needed for economical field application.
{"title":"Characteristics of TOC Treatment for Industrial Wastewater Treatment -Characteristics of Industrial Wastewater TOC Treatment Status and TOC Treatment by Ozone and Advanced Oxidation Process-","authors":"Kyeongjin Kim, Jeong-Pyo Jeon, I. Yeom","doi":"10.4491/ksee.2023.45.1.51","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.1.51","url":null,"abstract":"Objectives:As the organic pollutant indicator is changed from CODMn to TOC and the demand for TOC treatment of industrial wastewater increasing, the current situation of TOC treatment of wastewater discharge facilities of each industrial category is analyzed, and it is intended to consider the possibility of residual TOC treatment by ozone and advanced oxidation process.Methods:To review the TOC treatment situations of wastewater discharge facilities of each industrial category, the field survey data (46 sites) by Environment Ministry and Korea Environment Corporation were analyzed according to inflow TOC concentrations, direct/indirect discharge type, and main treatment process of wastewater treatment facilities. To review the characteristics of TOC treatment by ozone and advanced oxidation processes, previous studies and the results of field pilot tests conducted by ozone companies were comprehensively analyzed.Results and Discussion:The TOC treatment level varies depending on the inflow TOC concentrations to each industrial wastewater treatment facility, direct/indirect discharge type depending on the location of the wastewater treatment facilities, and the main treatment process of the wastewater treatment facility. In particular, the TOC removal rate differed by more than 20% depending on the presence or absence of biological treatment. The wastewater treatment facilities that require additional treatment of residual TOC were divided as follows (1) when the facility has biological treatment as main process, increasing unexpected inflow TOC load in treatment facilities or the condition of the biological treatment become worsen. (2) when the facility has phy-chemical treatment as main process, increasing unexpected inflow TOC load. (3) extending the replacement cycle of activated carbon to save maintenance cost. The advance oxidation process decomposes easily by OH radicals through the radical substitution of unsaturated hydrocarbons and aromatic compounds, so the removal rate of TOC by the O3+H2O2 advanced oxidation pilot test was 14.7~93.5%, higher than that of ozone oxidation. The specific ozone consumption per TOC removal amount (O3/ΔTOC) by O3+H2O2 advanced oxidation is 8.5~22.5mgO3/mgTOC, which is 1/5 of that of ozone oxidation only. In addition, comparing ozone demand by CODMn and TOC removal, ozone demand of O3+H2O2 advanced oxidation to remove TOC is 2.7 to 4.3 times compared to that by O3 oxidation to remove CODMn.Conclusion:In order to reduce residual TOC from industrial wastewater effluent, it is necessary to secure stability of the existing main treatment process in preparation for load fluctuations, and the technologies research on complex advanced oxidation processes, hybrid advanced oxidation processes, and pretreatment technology to reduce ozone demand is needed for economical field application.","PeriodicalId":52756,"journal":{"name":"daehanhwangyeonggonghaghoeji","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44363528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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