Pub Date : 2022-12-31DOI: 10.54279/mijeec.v4i3.248277
Chuyên Thuận Nguyễn, Chanthana Susawaengsup, Thomas Singer, Krittiya Tongkoom, Ralf Oberg, Rapeephun Dangtungee, P. Bhuyar
Agarwood (Aquilaria malaccensis) oil is one of the essential bioactive materials in the scent/ perfume industry for the middle east and gulf countries. The built-in functionality and availability of bioactive components of oil make agarwood more precious. In this study, the physically induced infected agarwood tree chops were extracted by microwave assisted Soxhlet extraction. Moreover, the extracted oil samples were analyzed against control not infected trees using Gas chromatography-mass spectroscopy (GC-MS) by GCMS (Agilent GC 6890zN MS 5973). The microwave assisted Soxhlet extraction revealed a higher amount of oil extraction. In the physically induced samples, 24 signal peaks were recorded employing GC-MS. The most prominent peak area recorded was -5-hydroxy-3-methyl-1-indanone detected at minute 41.89 with a peak area of 17.64%, followed by -methyl 4,4,7-trimethyl 4.7-dihydro indan -6- carboxylate at 23.17 min, occupying an area of 15.54%; followed by 3-carene recorded at 46.61 minutes with an area. According to this research, the microwave-assisted Soxhlet extraction method outperformed and can be utilized in the agarwood industry for enhanced oil production.
沉香油是中东和海湾国家香水工业中必不可少的生物活性物质之一。内置的功能和可用的生物活性成分的油使沉香更加珍贵。本研究采用微波辅助索氏提取法提取物理诱导的沉香木屑。采用气相色谱-质谱联用(GCMS) (Agilent GC 6890zN MS 5973)对提取的油样与未感染的对照进行分析。微波辅助索氏提取法可获得较高的油提取率。在物理诱导的样品中，用GC-MS记录了24个信号峰。记录到的峰面积最突出的是-5-羟基-3-甲基-1-吲哚酮，在41.89 min检测到，峰面积为17.64%，其次是-甲基4,4,7-三甲基4.7-二氢吲哚-6-羧酸酯，在23.17 min检测到，峰面积为15.54%;紧随其后的是3-carene，用时46.61分钟。研究结果表明，微波辅助索氏提取法在沉香工业中具有较好的优势，可用于提高沉香油的产量。
{"title":"Gas chromatography analysis of the microwave-aided extracted agarwood oil from physically induced Aquilaria malaccensis trees in Northern Thailand","authors":"Chuyên Thuận Nguyễn, Chanthana Susawaengsup, Thomas Singer, Krittiya Tongkoom, Ralf Oberg, Rapeephun Dangtungee, P. Bhuyar","doi":"10.54279/mijeec.v4i3.248277","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.248277","url":null,"abstract":"Agarwood (Aquilaria malaccensis) oil is one of the essential bioactive materials in the scent/ perfume industry for the middle east and gulf countries. The built-in functionality and availability of bioactive components of oil make agarwood more precious. In this study, the physically induced infected agarwood tree chops were extracted by microwave assisted Soxhlet extraction. Moreover, the extracted oil samples were analyzed against control not infected trees using Gas chromatography-mass spectroscopy (GC-MS) by GCMS (Agilent GC 6890zN MS 5973). The microwave assisted Soxhlet extraction revealed a higher amount of oil extraction. In the physically induced samples, 24 signal peaks were recorded employing GC-MS. The most prominent peak area recorded was -5-hydroxy-3-methyl-1-indanone detected at minute 41.89 with a peak area of 17.64%, followed by -methyl 4,4,7-trimethyl 4.7-dihydro indan -6- carboxylate at 23.17 min, occupying an area of 15.54%; followed by 3-carene recorded at 46.61 minutes with an area. According to this research, the microwave-assisted Soxhlet extraction method outperformed and can be utilized in the agarwood industry for enhanced oil production.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88862639","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 : 2022-12-17DOI: 10.54279/mijeec.v4i3.247529
Truc-Ly Le-Huynh, T. Itayama, Kaito Mitsunaga, Misigo W. S. Angalika, Seiji Suzuki
The blooming of toxic cyanobacteria Microcystis in eutrophicated reservoirs causes serious difficulties for water supply worldwide. For the appropriate management of such reservoirs, a prediction model of toxic cyanobacteria Microcystis can be a useful tool. Therefore, this study aims to develop a Bayesian hurdle Poisson model for statistical prediction of toxic Microcystis from only two predictors, air temperature and trophic state index (TSI) calculated from chlorophyll-a. The gene copy number of the mcyB gene was used as a surrogate of toxic Microcystis cell density. The data on mcyB gene and chlorophyll-a were collected from 20 reservoirs in Nagasaki Prefecture (Japan). The daily average air temperature was downloaded from the local meteorological stations and a mean for 30 days before sampling date was calculated. The results showed that higher temperature and larger TSI accelerate the growth of toxic Microcystis. Furthermore, this model successfully predicted mcyB gene copy number as a surrogate of toxic Microcystis cell density for different conditions of air temperature and TSI with sufficient accuracy. Therefore, the proposed model has the potential to be a useful prediction tool for toxic cyanobacteria Microcystis in the integrated management of reservoirs.
{"title":"Application of hurdle Poisson model to predict the abundance of toxic cyanobacteria Microcystis in reservoirs","authors":"Truc-Ly Le-Huynh, T. Itayama, Kaito Mitsunaga, Misigo W. S. Angalika, Seiji Suzuki","doi":"10.54279/mijeec.v4i3.247529","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.247529","url":null,"abstract":"The blooming of toxic cyanobacteria Microcystis in eutrophicated reservoirs causes serious difficulties for water supply worldwide. For the appropriate management of such reservoirs, a prediction model of toxic cyanobacteria Microcystis can be a useful tool. Therefore, this study aims to develop a Bayesian hurdle Poisson model for statistical prediction of toxic Microcystis from only two predictors, air temperature and trophic state index (TSI) calculated from chlorophyll-a. The gene copy number of the mcyB gene was used as a surrogate of toxic Microcystis cell density. The data on mcyB gene and chlorophyll-a were collected from 20 reservoirs in Nagasaki Prefecture (Japan). The daily average air temperature was downloaded from the local meteorological stations and a mean for 30 days before sampling date was calculated. The results showed that higher temperature and larger TSI accelerate the growth of toxic Microcystis. Furthermore, this model successfully predicted mcyB gene copy number as a surrogate of toxic Microcystis cell density for different conditions of air temperature and TSI with sufficient accuracy. Therefore, the proposed model has the potential to be a useful prediction tool for toxic cyanobacteria Microcystis in the integrated management of reservoirs.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85533312","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 : 2022-12-01DOI: 10.54279/mijeec.v4i3.248270
N. Dussadee, Kamoldara Reansuwan, Rameshprabu Ramaraj, Yuwalee Unpaprom
Anaerobic co-digestion of concentrated swine manure with elephant grass silage was used, and this study carried out in full-scale three continuously stirred tank reactors was operated at mesophilic temperature. The Biogas impurity removal procedure was enhanced by using a molecular sieve and activated carbon. Two molecular sieve tanks are used to absorb water from the biogas. An activated carbon tank (2 meters) was used to eliminate H2S to < 1 ppm before entering the gas tank. In the form of compressed bio-methane gas (CBG), production was 14,400 m3/day (CH4 60-70%), and the amount of CBG was 9,600 m3/day 6.8 tons/day. The raw biogas containing CH4, CO2, and O2 are 68.8%, 29.7% and 0% with H2S 768 ppm. After the enhancement process, CBG having CH4, CO2, O2 are 89.35%, 10.05 0% and 0.02% with < 0.01 ppm H2S. Therefore, after the purification process amount of CO2, H2S gas was considerably reduced and CH4 was improved by up to 90% by volume, and then the CBG was compressed to 250 bar tanks to the fuel for cars. Therefore, these results clearly demonstrate that the activated carbon method is feasible to process for the removal of CO2 and H2S from biogas in a large-scale plant.
{"title":"Removal of CO2 and H2S from biogas and enhanced compressed bio-methane gas production from swine manure and elephant grass","authors":"N. Dussadee, Kamoldara Reansuwan, Rameshprabu Ramaraj, Yuwalee Unpaprom","doi":"10.54279/mijeec.v4i3.248270","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.248270","url":null,"abstract":"Anaerobic co-digestion of concentrated swine manure with elephant grass silage was used, and this study carried out in full-scale three continuously stirred tank reactors was operated at mesophilic temperature. The Biogas impurity removal procedure was enhanced by using a molecular sieve and activated carbon. Two molecular sieve tanks are used to absorb water from the biogas. An activated carbon tank (2 meters) was used to eliminate H2S to < 1 ppm before entering the gas tank. In the form of compressed bio-methane gas (CBG), production was 14,400 m3/day (CH4 60-70%), and the amount of CBG was 9,600 m3/day 6.8 tons/day. The raw biogas containing CH4, CO2, and O2 are 68.8%, 29.7% and 0% with H2S 768 ppm. After the enhancement process, CBG having CH4, CO2, O2 are 89.35%, 10.05 0% and 0.02% with < 0.01 ppm H2S. Therefore, after the purification process amount of CO2, H2S gas was considerably reduced and CH4 was improved by up to 90% by volume, and then the CBG was compressed to 250 bar tanks to the fuel for cars. Therefore, these results clearly demonstrate that the activated carbon method is feasible to process for the removal of CO2 and H2S from biogas in a large-scale plant.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74232626","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 : 2022-11-15DOI: 10.54279/mijeec.v4i3.247635
Truc-Ly Le-Huynh, N. Iwami, N. Whangchai, Redel Gutierrez, K. Shimizu, T. Itayama
Understanding the phytoplankton in aquaculture ponds is critical for proper pond management. Despite the importance, the relationships between phytoplankton composition, cultured fish type, season, and nutrients were not well understood. This study statistically investigated these relationships in aquaculture ponds. Data collected at 21 tilapia and 13 catfish ponds in September 2009 (wet season), December 2009 (cold season), and March 2010 (hot season) in northern Thailand were used for the analysis. The statistical analysis showed that PO4-P and NH4-N concentrations in catfish ponds were significantly higher than in tilapia ponds (p < 0.05, Wilcoxon test). The cyanobacterial abundance in catfish ponds was significantly greater than in tilapia ponds (p < 0.05, Wilcoxon test). In the hot season (March), green algae were abundant (p < 0.05), while cyanobacteria were depleted (p < 0.05). Multiple linear regression model was applied to determine important factors for statistically explaining cyanobacterial abundance. The result indicated that the best model selected by AICc included season and pond type as factors influencing cyanobacterial abundance but not nutrients. However, since the effect of nutrients was included in the difference in nutrient concentration due to the difference in fish species in the ponds, it was speculated that nutrients were insignificant as explanatory variables. Furthermore, it was hypothesized that cyanobacterial abundance was reduced in March (hot season) because the predation of cyanobacteria by tilapia may be encouraged at high temperature.
{"title":"Statistical analysis of the effects of environmental factors and fish species on class-sorted phytoplankton composition in aquaculture ponds in northern Thailand","authors":"Truc-Ly Le-Huynh, N. Iwami, N. Whangchai, Redel Gutierrez, K. Shimizu, T. Itayama","doi":"10.54279/mijeec.v4i3.247635","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.247635","url":null,"abstract":"Understanding the phytoplankton in aquaculture ponds is critical for proper pond management. Despite the importance, the relationships between phytoplankton composition, cultured fish type, season, and nutrients were not well understood. This study statistically investigated these relationships in aquaculture ponds. Data collected at 21 tilapia and 13 catfish ponds in September 2009 (wet season), December 2009 (cold season), and March 2010 (hot season) in northern Thailand were used for the analysis. The statistical analysis showed that PO4-P and NH4-N concentrations in catfish ponds were significantly higher than in tilapia ponds (p < 0.05, Wilcoxon test). The cyanobacterial abundance in catfish ponds was significantly greater than in tilapia ponds (p < 0.05, Wilcoxon test). In the hot season (March), green algae were abundant (p < 0.05), while cyanobacteria were depleted (p < 0.05). Multiple linear regression model was applied to determine important factors for statistically explaining cyanobacterial abundance. The result indicated that the best model selected by AICc included season and pond type as factors influencing cyanobacterial abundance but not nutrients. However, since the effect of nutrients was included in the difference in nutrient concentration due to the difference in fish species in the ponds, it was speculated that nutrients were insignificant as explanatory variables. Furthermore, it was hypothesized that cyanobacterial abundance was reduced in March (hot season) because the predation of cyanobacteria by tilapia may be encouraged at high temperature.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"182 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84074349","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 : 2022-11-05DOI: 10.54279/mijeec.v4i3.248262
Warichsa Kongchan, Yuwalee Unpaprom, Natthawud Dussadee, R. Ramaraj
Combining alkaline and thermal pretreatments for the conversion of low-grade konjac powder to fermentable sugars was studied. After pretreatment, an enzyme hydrolysis procedure was applied with cellulase. The pretreatment and hydrolyzed liquids were used with Saccharomyces cerevisiae for the fermentation process in the batch system. Analysis with a spectrometer revealed that the fundamental matter of low-quality konjac powder was severely degraded in order to enhance the fermentable sugars. Our investigation found that the alkaline combination thermal pretreatment produced the most reducing sugars. The impacts of several operational factors were examined. The highest alcohol content (3.551g/L), heating value (3570.27Cal/g) and energy values (17.15 MJ/kg) were achieved, this might be a very promising method of low-grade konjac powder use. Pretreatment of low-grade konjac powder for bioethanol production is highly advised due to its extremely low cost and high yield of reducing sugars and bioethanol.
{"title":"Bioethanol production from low-grade konjac powder via combination of alkaline and thermal pretreatments","authors":"Warichsa Kongchan, Yuwalee Unpaprom, Natthawud Dussadee, R. Ramaraj","doi":"10.54279/mijeec.v4i3.248262","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.248262","url":null,"abstract":"Combining alkaline and thermal pretreatments for the conversion of low-grade konjac powder to fermentable sugars was studied. After pretreatment, an enzyme hydrolysis procedure was applied with cellulase. The pretreatment and hydrolyzed liquids were used with Saccharomyces cerevisiae for the fermentation process in the batch system. Analysis with a spectrometer revealed that the fundamental matter of low-quality konjac powder was severely degraded in order to enhance the fermentable sugars. Our investigation found that the alkaline combination thermal pretreatment produced the most reducing sugars. The impacts of several operational factors were examined. The highest alcohol content (3.551g/L), heating value (3570.27Cal/g) and energy values (17.15 MJ/kg) were achieved, this might be a very promising method of low-grade konjac powder use. Pretreatment of low-grade konjac powder for bioethanol production is highly advised due to its extremely low cost and high yield of reducing sugars and bioethanol.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83271839","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 : 2022-10-27DOI: 10.54279/mijeec.v4i3.248256
K. M. Palanisamy, O. Bhat, M. O. Oteikwu, N. Govindan, G. P. Maniam, Rameshprabhu Ramaraj, Y. Unpaprom
There is an urgent demand for an evolution of renewable energy resources due to the rising global energy demand, resource depletion, growing emphasis on reducing climate change, and resource scarcity. Among many resources, Microalgae are thought to be the cleanest alternative feedstock for biofuels and biorefineries because of their advantages of quick growth, effective carbon dioxide fixation, lack of competition for agricultural production and potable water, and the potential to accumulate massive volumes of lipids and carbohydrates. Therefore, this review has discussed the different wastewater which can support and enhance the growth of microalgae, biosynthesis of lipids, production of biofuels from microalgae, and biochemical properties of biofuel. In order to minimize the accumulation of wastewater to protect the environment from pollution, apply wastewater to grow microalgae to achieve the goal of bio circular economy. This review provides clear details and a summary of the production of biofuel from microalgae grown in wastewater.
{"title":"Production of biofuel from microalgae grown in wastewater- A review","authors":"K. M. Palanisamy, O. Bhat, M. O. Oteikwu, N. Govindan, G. P. Maniam, Rameshprabhu Ramaraj, Y. Unpaprom","doi":"10.54279/mijeec.v4i3.248256","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.248256","url":null,"abstract":"There is an urgent demand for an evolution of renewable energy resources due to the rising global energy demand, resource depletion, growing emphasis on reducing climate change, and resource scarcity. Among many resources, Microalgae are thought to be the cleanest alternative feedstock for biofuels and biorefineries because of their advantages of quick growth, effective carbon dioxide fixation, lack of competition for agricultural production and potable water, and the potential to accumulate massive volumes of lipids and carbohydrates. Therefore, this review has discussed the different wastewater which can support and enhance the growth of microalgae, biosynthesis of lipids, production of biofuels from microalgae, and biochemical properties of biofuel. In order to minimize the accumulation of wastewater to protect the environment from pollution, apply wastewater to grow microalgae to achieve the goal of bio circular economy. This review provides clear details and a summary of the production of biofuel from microalgae grown in wastewater.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81008769","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 : 2022-10-09DOI: 10.54279/mijeec.v4i3.248241
Anodar Ratchawet, P. Chaiworn
This study aimed to produce a nanocatalysts from inexpensive barley straw using nickel (Ni) and cobalt (Co) to support waste cooking oil-based biodiesel production. At 400 °C without oxygen and 1-5 bars of pressure, the gasification procedure of barley straw biomass (100g dry basis) was utilized in a muffle furnace with Ni and Co nano-catalysts. The biomass:Ni:Co catalyst mixing ratio is 1:1:1. The catalyst content and reaction time were applied for 2 hours. Then, at molar ratios of methanol:oil (6:1, 9:1, and 12:1) with the amount of catalyst (1, 2, and 3% weight percent basis), at 2 hours reaction time. Accordingly, the factors impacting the transesterification of biodiesel synthesis were evaluated. The process employing methanol:oil molar ratio of 6:1 and a catalyst quantity of 2% wt was the best for producing biodiesel. Based on the results of this study, nanocatalysts formed from biomass, which can be obtained from agricultural waste, hold commercial promise as a catalyst source for biodiesel.
{"title":"Biomass-derived nano-catalyst for biodiesel production from waste cooking oil","authors":"Anodar Ratchawet, P. Chaiworn","doi":"10.54279/mijeec.v4i3.248241","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.248241","url":null,"abstract":"This study aimed to produce a nanocatalysts from inexpensive barley straw using nickel (Ni) and cobalt (Co) to support waste cooking oil-based biodiesel production. At 400 °C without oxygen and 1-5 bars of pressure, the gasification procedure of barley straw biomass (100g dry basis) was utilized in a muffle furnace with Ni and Co nano-catalysts. The biomass:Ni:Co catalyst mixing ratio is 1:1:1. The catalyst content and reaction time were applied for 2 hours. Then, at molar ratios of methanol:oil (6:1, 9:1, and 12:1) with the amount of catalyst (1, 2, and 3% weight percent basis), at 2 hours reaction time. Accordingly, the factors impacting the transesterification of biodiesel synthesis were evaluated. The process employing methanol:oil molar ratio of 6:1 and a catalyst quantity of 2% wt was the best for producing biodiesel. Based on the results of this study, nanocatalysts formed from biomass, which can be obtained from agricultural waste, hold commercial promise as a catalyst source for biodiesel.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87201218","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 : 2022-09-28DOI: 10.54279/mijeec.v4i3.247534
Misigo W. S. Angalika, Seiji Suzuki, Truc-Ly Le-Huynh, T. Itayama, Wataru Tanaka
This study is a preliminary spatial-temporal assessment method of the ungauged catchment to determine the variation in water quality (WQ) and the land use influence on river basins’ health. The intermittent WQ data, the principal component analysis, and the redundancy analysis were used to evaluate the (dis)similarity among the 10 ungauged streams and their significance in the entire catchment. These revealed some similarities/differences in nutrient pollution and latent land-use influence on the streams’ health. There were similarities between R6-R7, R9-R10, among R1 to R4 basins, while R5 and R8 had distinct variances in their WQ dynamics. The intensive vegetable and rice production in R5, R7, R8, R9, and R10 basins were the major sources of high nutrient concentrations. The unique variations, especially in R5 and R8 basins could be attributed to other different pollution sources. Hence, it’s of great significance to carry out comprehensive research in the above 5 river basins. That is the efficiency of management practices, identification of pollution sources, and the extent to which the elevated nutrients in the streams interact with biota within the river regime. This research offers a method to evaluate WQ dynamics in relation to human interferences in river basins of a catchment with limited data under similar climatic conditions.
{"title":"Assessing nutrient budget of ungauged catchment using intermittent water quality markers","authors":"Misigo W. S. Angalika, Seiji Suzuki, Truc-Ly Le-Huynh, T. Itayama, Wataru Tanaka","doi":"10.54279/mijeec.v4i3.247534","DOIUrl":"https://doi.org/10.54279/mijeec.v4i3.247534","url":null,"abstract":"This study is a preliminary spatial-temporal assessment method of the ungauged catchment to determine the variation in water quality (WQ) and the land use influence on river basins’ health. The intermittent WQ data, the principal component analysis, and the redundancy analysis were used to evaluate the (dis)similarity among the 10 ungauged streams and their significance in the entire catchment. These revealed some similarities/differences in nutrient pollution and latent land-use influence on the streams’ health. There were similarities between R6-R7, R9-R10, among R1 to R4 basins, while R5 and R8 had distinct variances in their WQ dynamics. The intensive vegetable and rice production in R5, R7, R8, R9, and R10 basins were the major sources of high nutrient concentrations. The unique variations, especially in R5 and R8 basins could be attributed to other different pollution sources. Hence, it’s of great significance to carry out comprehensive research in the above 5 river basins. That is the efficiency of management practices, identification of pollution sources, and the extent to which the elevated nutrients in the streams interact with biota within the river regime. This research offers a method to evaluate WQ dynamics in relation to human interferences in river basins of a catchment with limited data under similar climatic conditions.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78878072","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}
This research aims to estimate whether the WTP for fish conservation zones in terms of fish species protection areas. The authors used cross-sectional data that was collected from 369 respondents in 3 target villages in the Khong district of Champasak province Laos in 2021 and utilised WTP and maximum likelihood regression, marginal effect result for analysis. The estimate of the empirical model used for econometric analysis is based on the previously described model. This study finds that the average WTP households in target villages for fish conservation zones is 12.12 US $/household/year. The bid price, the recognition of the necessity of the fish conservation zones' knowledge, and average monthly income all positively impact WTP for fish conservation zones with a statistically significant impact. The authors conclude that the fish conservation zones might increase fish species in the study area. This valuation can be calculated as the cost to improve the quality of establishing fish conservation zones by multiplying the number of people in three villages of 768 households, which is the value expectation of the economy at 9,310 US $/year. However, improving public goods conservation now is the duty of everybody, so if we would like to strengthen fish conservation zones more efficiently than ever, we may find more suitable and sustainable alternatives.
{"title":"Factors affecting household’s willingness to pay for the fish conservation zones a case study from Khong District, Champasak Province, Laos","authors":"Salongxay Fongsamouth, Sakhone Keosoubinh, Philavanh Homsombath, Vilaphone Sounakeovongsa, Vannasinh Souvannasouk, Nitphone Senganatham, Vanphakonekham Koulavongsa","doi":"10.54279/mijeec.v4i1.247331","DOIUrl":"https://doi.org/10.54279/mijeec.v4i1.247331","url":null,"abstract":"This research aims to estimate whether the WTP for fish conservation zones in terms of fish species protection areas. The authors used cross-sectional data that was collected from 369 respondents in 3 target villages in the Khong district of Champasak province Laos in 2021 and utilised WTP and maximum likelihood regression, marginal effect result for analysis. The estimate of the empirical model used for econometric analysis is based on the previously described model. This study finds that the average WTP households in target villages for fish conservation zones is 12.12 US $/household/year. The bid price, the recognition of the necessity of the fish conservation zones' knowledge, and average monthly income all positively impact WTP for fish conservation zones with a statistically significant impact. The authors conclude that the fish conservation zones might increase fish species in the study area. This valuation can be calculated as the cost to improve the quality of establishing fish conservation zones by multiplying the number of people in three villages of 768 households, which is the value expectation of the economy at 9,310 US $/year. However, improving public goods conservation now is the duty of everybody, so if we would like to strengthen fish conservation zones more efficiently than ever, we may find more suitable and sustainable alternatives.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73970382","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 : 2022-08-28DOI: 10.54279/mijeec.v4i2.248042
P. Bhuyar, Sarocha Jaichanta, Winitra Leelapattana, Suthira Sitthikun, N. Dussadee, R. Ramaraj, Y. Unpaprom
Much research on the shallot phytochemical is currently employed in various disciplines, such as medical reasons. Shallot (Allium ascalonicum) is a plant species belonging to the family Amaryllidaceae. It is a native plant grown in the North and Northeast region of Thailand. The present study aimed to determine the extracts' yield and antioxidant properties of black shallots made from fresh shallots. The black shallots were extracted with digestion by water, 47.5% and 95% ethanol at 50 ℃ for 1, 3 and 5 hours. The result discovered that black shallot extraction with digestion by water for 5 hours showed the highest weight of extracts (3.620 g). The determination of antioxidant activity by DPPH was observed, and extraction by water for 5 hours gave the highest percentage of inhibition. It was equal to 84.61%, which is not different from the digestion of 95% ethanol for 1 hour, with 83.48%. Similarly, the most outstanding value of IC50 was obtained from extraction with 95% ethanol for 1 and 5 hours with 21.30 mg/ml and 20.52 mg/ml. In terms of monitoring, the digestion method evaluated the productivity of pectin extracts from citrus peel. Hydrochloric acid (0.100, 0.050 and 0.025 M) was used as a solvent at 95 ℃ for 30, 60 and 90 minutes. The pectin extract by 0.1 M hydrochloric acid for 90 minutes gave the highest extract (5.237 g). The preliminary testing of cosmetic production was done by mixing black shallot extracts and pectin from citrus peels, and the two substances can be combined. Still, without adding preservatives, they could cause contamination in cosmetic samples.
{"title":"Beneficiation of organic black onion and lemon peel by-products through extraction and investigation of bioactive compounds","authors":"P. Bhuyar, Sarocha Jaichanta, Winitra Leelapattana, Suthira Sitthikun, N. Dussadee, R. Ramaraj, Y. Unpaprom","doi":"10.54279/mijeec.v4i2.248042","DOIUrl":"https://doi.org/10.54279/mijeec.v4i2.248042","url":null,"abstract":"Much research on the shallot phytochemical is currently employed in various disciplines, such as medical reasons. Shallot (Allium ascalonicum) is a plant species belonging to the family Amaryllidaceae. It is a native plant grown in the North and Northeast region of Thailand. The present study aimed to determine the extracts' yield and antioxidant properties of black shallots made from fresh shallots. The black shallots were extracted with digestion by water, 47.5% and 95% ethanol at 50 ℃ for 1, 3 and 5 hours. The result discovered that black shallot extraction with digestion by water for 5 hours showed the highest weight of extracts (3.620 g). The determination of antioxidant activity by DPPH was observed, and extraction by water for 5 hours gave the highest percentage of inhibition. It was equal to 84.61%, which is not different from the digestion of 95% ethanol for 1 hour, with 83.48%. Similarly, the most outstanding value of IC50 was obtained from extraction with 95% ethanol for 1 and 5 hours with 21.30 mg/ml and 20.52 mg/ml. In terms of monitoring, the digestion method evaluated the productivity of pectin extracts from citrus peel. Hydrochloric acid (0.100, 0.050 and 0.025 M) was used as a solvent at 95 ℃ for 30, 60 and 90 minutes. The pectin extract by 0.1 M hydrochloric acid for 90 minutes gave the highest extract (5.237 g). The preliminary testing of cosmetic production was done by mixing black shallot extracts and pectin from citrus peels, and the two substances can be combined. Still, without adding preservatives, they could cause contamination in cosmetic samples.","PeriodicalId":18176,"journal":{"name":"Maejo International Journal of Energy and Environmental Communication","volume":"126 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76703127","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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