Pub Date : 2022-12-27DOI: 10.5593/sgem2022v/4.2/s18.17
B. Dousova, M. Lhotka, Eva Bedrnová
Arsenic (As) and antimony (Sb) are elements with similar chemistry and geochemistry, but their environmental risk differ depending on the origin and degree of the pollution. As and Sb are both very toxic, particularly their inorganic substances in the oxidation states of III and V, which also represent the most common As/Sb forms in the environment. In environmental systems, As mostly occurs as the tetrahedrally coordinated, pentavalent arsenate AsO43- (in oxidising environment), and the trivalent arsenite AsO33- (under weakly reducing to reducing conditions), while Sb is entirely found as the octahedrally coordinated, pentavalent antimonate Sb(OH)6-, over a wide redox potential range. Several low-grade materials (zeolite, biochar) and building waste (concrete slurry waste) in original and surface modified forms were tested as selective adsorbents of As and Sb oxyanions from contaminated waters. The adsorption stability of oxyanions was verified by the Langmuir adsorption model. In natural systems As oxyanions demonstrated the preferential affinity for iron (Fe) oxides/hydroxides, while Sb oxyanions were more selectively binded to organic matter (OM). The adsorption of tested oxyanions on Fe/Mn modified sorbents ran with a higher efficiency (?95%) compare to original materials, with a decreasing trend: As(V) ? Sb(V).
{"title":"USE OF LOW-GRADE AND RECYCLED MATEWRIALS AS SELECTIVE ARSENATE AND ANTIMONATE SORBENTS","authors":"B. Dousova, M. Lhotka, Eva Bedrnová","doi":"10.5593/sgem2022v/4.2/s18.17","DOIUrl":"https://doi.org/10.5593/sgem2022v/4.2/s18.17","url":null,"abstract":"Arsenic (As) and antimony (Sb) are elements with similar chemistry and geochemistry, but their environmental risk differ depending on the origin and degree of the pollution. As and Sb are both very toxic, particularly their inorganic substances in the oxidation states of III and V, which also represent the most common As/Sb forms in the environment. In environmental systems, As mostly occurs as the tetrahedrally coordinated, pentavalent arsenate AsO43- (in oxidising environment), and the trivalent arsenite AsO33- (under weakly reducing to reducing conditions), while Sb is entirely found as the octahedrally coordinated, pentavalent antimonate Sb(OH)6-, over a wide redox potential range. Several low-grade materials (zeolite, biochar) and building waste (concrete slurry waste) in original and surface modified forms were tested as selective adsorbents of As and Sb oxyanions from contaminated waters. The adsorption stability of oxyanions was verified by the Langmuir adsorption model. In natural systems As oxyanions demonstrated the preferential affinity for iron (Fe) oxides/hydroxides, while Sb oxyanions were more selectively binded to organic matter (OM). The adsorption of tested oxyanions on Fe/Mn modified sorbents ran with a higher efficiency (?95%) compare to original materials, with a decreasing trend: As(V) ? Sb(V).","PeriodicalId":234250,"journal":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies, VOL 22, ISSUE 4.2","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129813096","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 : 2022-12-27DOI: 10.5593/sgem2022v/4.2/s18.16
Ioana Andreea Petrean, V. Micle
Nutrient-poor, sandy, sterile material from the post-mining sterile dumps such as those in the Maramures region (Romania) presents a challenge for plants. Sterile dumps are considered extreme environments for plants due to their unfavorable physicochemical properties. Phytoremediation has great potential to remove heavy metals from sterile dumps, and Indian mustard (Brassica juncea) seems to be a possible candidate species for this purpose. The potential of Brassica juncea seeds to germinate in a medium contaminated with high concentrations of Cu, Pb and Cd was assessed using germination tests on Indian mustard seeds in the presence of various liquid mixtures made from fertilizer and sterile material collected from three different mining sterile dumps in Maramures county, Romania. The experiment results showed that adding fertilizers did not enhance the germination process of Brassica juncea seeds and that the optimal pH for Brassica juncea to sprout extremely well is 5.5. The results suggest that Brassica juncea could be used in efficient phytoremediation of the sterile dumps. This paper's objective consists of observing the germination of Indian mustard (Brassica juncea L.) in the presence of high concentrations of heavy metals from sterile mining dumps with the purpose of the phytoremediation of the studied polluted areas from Maramures county (Romania).
{"title":"STUDY REGARDING GERMINATION OF INDIAN MUSTARD (BRASSICA JUNCEA L.) FOR APPLICATION IN PHYTOREMEDIATION OF STERILE DUMPS POLLUTED WITH HEAVY METALS","authors":"Ioana Andreea Petrean, V. Micle","doi":"10.5593/sgem2022v/4.2/s18.16","DOIUrl":"https://doi.org/10.5593/sgem2022v/4.2/s18.16","url":null,"abstract":"Nutrient-poor, sandy, sterile material from the post-mining sterile dumps such as those in the Maramures region (Romania) presents a challenge for plants. Sterile dumps are considered extreme environments for plants due to their unfavorable physicochemical properties. Phytoremediation has great potential to remove heavy metals from sterile dumps, and Indian mustard (Brassica juncea) seems to be a possible candidate species for this purpose. The potential of Brassica juncea seeds to germinate in a medium contaminated with high concentrations of Cu, Pb and Cd was assessed using germination tests on Indian mustard seeds in the presence of various liquid mixtures made from fertilizer and sterile material collected from three different mining sterile dumps in Maramures county, Romania. The experiment results showed that adding fertilizers did not enhance the germination process of Brassica juncea seeds and that the optimal pH for Brassica juncea to sprout extremely well is 5.5. The results suggest that Brassica juncea could be used in efficient phytoremediation of the sterile dumps. This paper's objective consists of observing the germination of Indian mustard (Brassica juncea L.) in the presence of high concentrations of heavy metals from sterile mining dumps with the purpose of the phytoremediation of the studied polluted areas from Maramures county (Romania).","PeriodicalId":234250,"journal":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies, VOL 22, ISSUE 4.2","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127935793","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 : 2022-12-27DOI: 10.5593/sgem2022v/4.2/s18.05
Y. Chernysh, I. Ablieieva, V. Chubur, P. Skvortsova, H. Roubík
This article is focused on performing a SWOT analysis of agricultural waste management methods. This approach can be applied in the biogas technology strategic planning process in Ukraine, which can solve the issue of implementation of environmental guidelines for the development of biofuels and biofertilizers. The main factors that determine how digestate is used are its quality, local conditions, regulations, and documents. Fertilizing fields with digestate provides many advantages, for example: reduced demand for plant protection products, reduction of unpleasant odor, and destruction of possible pathogens. The strengths and weaknesses of the implementation of biogas plants in Ukraine have been identified, and opportunities and threats have been considered. In general, the introduction of biogas technology is a very promising solution for the agricultural sector. Taking into account that a biogas plant is considered a potentially hazardous object for workers, it is necessary to constantly monitor the parameters of reactor operation in order to ensure the technological and environmental safety of the engineering facilities. For Ukraine, there is a shortage of specialists to set up an effective operation of biogas equipment and bring it to the industrial scale. It is necessary to consult with medium and small farms interested in the feasibility study and implementation of biogas technologies.
{"title":"BIOPOTENTIAL OF AGRICULTURAL WASTE: PRODUCTION OF BIOFERTILIZERS AND BIOFUELS","authors":"Y. Chernysh, I. Ablieieva, V. Chubur, P. Skvortsova, H. Roubík","doi":"10.5593/sgem2022v/4.2/s18.05","DOIUrl":"https://doi.org/10.5593/sgem2022v/4.2/s18.05","url":null,"abstract":"This article is focused on performing a SWOT analysis of agricultural waste management methods. This approach can be applied in the biogas technology strategic planning process in Ukraine, which can solve the issue of implementation of environmental guidelines for the development of biofuels and biofertilizers. The main factors that determine how digestate is used are its quality, local conditions, regulations, and documents. Fertilizing fields with digestate provides many advantages, for example: reduced demand for plant protection products, reduction of unpleasant odor, and destruction of possible pathogens. The strengths and weaknesses of the implementation of biogas plants in Ukraine have been identified, and opportunities and threats have been considered. In general, the introduction of biogas technology is a very promising solution for the agricultural sector. Taking into account that a biogas plant is considered a potentially hazardous object for workers, it is necessary to constantly monitor the parameters of reactor operation in order to ensure the technological and environmental safety of the engineering facilities. For Ukraine, there is a shortage of specialists to set up an effective operation of biogas equipment and bring it to the industrial scale. It is necessary to consult with medium and small farms interested in the feasibility study and implementation of biogas technologies.","PeriodicalId":234250,"journal":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies, VOL 22, ISSUE 4.2","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126690791","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 : 2022-12-27DOI: 10.5593/sgem2022v/4.2/s19.31
Aivars Rubenis, A. Laizāns, A. Zvirbule
Because of the electric propulsion, electric scooters could be a potential way how to decrease greenhouse gas (GHG) emissions in urban transportation sector; however, recent research has cast doubt on that. This article focuses on the effect the electric scooter use has on CO2 emissions by examining the electric scooter trip data obtained during 2021 scooter season in Riga city. As shared scooters routinely replace already existing modes of transportation, the article analyses the effect which this replacement has on net CO2 emissions in the city. We argue that not all replacement modes will bring actual decrease of CO2 emissions. The results indicate that most of the shared e-scooter trips in Riga fall into the 1-2 km distance category, where it replaces not just cars, but also public transportation, walking and cycling, and actually increases CO2 emissions. The article examines the factors contributing to the CO2 emissions and relative impact of each. The results demonstrate that the largest impact comes from the scooter and battery manufacturing, thus scooter lifetime has decisive impact on the overall net CO2 emissions. In addition, this research found fundamental differences between expected scooter lifetime data claimed by shared scooter operators (5 years) and the average reallife data (156 days). It results in shared e-scooters creating additional 239.9 tonnes CO2 in Riga, and minimum scooter lifetime should be at least 5 years, for shared scooters to become CO2 neutral. This study aims to contribute to transportation literature by demonstrating net CO2 emission calculation methodology as well as empirical evidence on e-scooter trips in North-Eastern Europe region and to help local authorities to make decisions on reaching environmental targets in transportation sector.
{"title":"EFFECT OF SHARED ELECTRIC SCOOTERS ON URBAN GREEN HOUSE GAS EMISSIONS: CASE OF RIGA","authors":"Aivars Rubenis, A. Laizāns, A. Zvirbule","doi":"10.5593/sgem2022v/4.2/s19.31","DOIUrl":"https://doi.org/10.5593/sgem2022v/4.2/s19.31","url":null,"abstract":"Because of the electric propulsion, electric scooters could be a potential way how to decrease greenhouse gas (GHG) emissions in urban transportation sector; however, recent research has cast doubt on that. This article focuses on the effect the electric scooter use has on CO2 emissions by examining the electric scooter trip data obtained during 2021 scooter season in Riga city. As shared scooters routinely replace already existing modes of transportation, the article analyses the effect which this replacement has on net CO2 emissions in the city. We argue that not all replacement modes will bring actual decrease of CO2 emissions. The results indicate that most of the shared e-scooter trips in Riga fall into the 1-2 km distance category, where it replaces not just cars, but also public transportation, walking and cycling, and actually increases CO2 emissions. The article examines the factors contributing to the CO2 emissions and relative impact of each. The results demonstrate that the largest impact comes from the scooter and battery manufacturing, thus scooter lifetime has decisive impact on the overall net CO2 emissions. In addition, this research found fundamental differences between expected scooter lifetime data claimed by shared scooter operators (5 years) and the average reallife data (156 days). It results in shared e-scooters creating additional 239.9 tonnes CO2 in Riga, and minimum scooter lifetime should be at least 5 years, for shared scooters to become CO2 neutral. This study aims to contribute to transportation literature by demonstrating net CO2 emission calculation methodology as well as empirical evidence on e-scooter trips in North-Eastern Europe region and to help local authorities to make decisions on reaching environmental targets in transportation sector.","PeriodicalId":234250,"journal":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies, VOL 22, ISSUE 4.2","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114296550","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 : 2022-12-27DOI: 10.5593/sgem2022v/4.2/s19.45
Sorin Simion, G. Gaman, Angelica-Nicoleta Găman, Daniel Pupazan, A. Simion
Noise is a "by-product of technological metabolism", omnipresent in most workplaces, representing one of the discomfort factors for personnel working in the presence of this noxae. Knowledge of risks generated by exposure to noise specific to each activity carried out, allow quantification of the effects on workers such as: masking, auditory fatigue, sound trauma, acute hypoacusis, professional deafness. Accidental exposure to noise leads to auditory fatigue, which is a transient and reversible phenomenon, but prolonged exposure to high-intensity noise in work environments generates occupational diseases, eventually leading to permanent and irreversible loss of hearing (occupational deafness). The issue of noise is also of undeniable importance from an economic point of view, because of the low yield generated by discomfort associated to noise and errors in performing various operations, mostly caused by attention distraction. Because of mechanization and increased work speed, the number of people exposed to noise is constantly increasing. The current paper analyses the way in which noise generated by technological processes in the automotive industry influences the activity of workers, because the automotive industry represents one of the most developed and dynamic economic sectors, cars being manufactured in a sustained manner because the supply-demand ratio is extremely high. Preventive activity regarding noise exposure must be based on noise level determinations. In this sense, the purpose of the paper is the analysis of noise determinations carried out at an economic operator in the automotive sector, namely the production of metal subassemblies for car bodies and comparison of values obtained with the limit values set by in force legislation, in order to assess the degree of exposure to occupational risk factors present during normal working time.
{"title":"NOISE - DISRUPTIVE FACTOR IN WORK","authors":"Sorin Simion, G. Gaman, Angelica-Nicoleta Găman, Daniel Pupazan, A. Simion","doi":"10.5593/sgem2022v/4.2/s19.45","DOIUrl":"https://doi.org/10.5593/sgem2022v/4.2/s19.45","url":null,"abstract":"Noise is a \"by-product of technological metabolism\", omnipresent in most workplaces, representing one of the discomfort factors for personnel working in the presence of this noxae. \u0000Knowledge of risks generated by exposure to noise specific to each activity carried out, allow quantification of the effects on workers such as: masking, auditory fatigue, sound trauma, acute hypoacusis, professional deafness. \u0000Accidental exposure to noise leads to auditory fatigue, which is a transient and reversible phenomenon, but prolonged exposure to high-intensity noise in work environments generates occupational diseases, eventually leading to permanent and irreversible loss of hearing (occupational deafness). The issue of noise is also of undeniable importance from an economic point of view, because of the low yield generated by discomfort associated to noise and errors in performing various operations, mostly caused by attention distraction. \u0000Because of mechanization and increased work speed, the number of people exposed to noise is constantly increasing. \u0000The current paper analyses the way in which noise generated by technological processes in the automotive industry influences the activity of workers, because the automotive industry represents one of the most developed and dynamic economic sectors, cars being manufactured in a sustained manner because the supply-demand ratio is extremely high. Preventive activity regarding noise exposure must be based on noise level determinations. In this sense, the purpose of the paper is the analysis of noise determinations carried out at an economic operator in the automotive sector, namely the production of metal subassemblies for car bodies and comparison of values obtained with the limit values set by in force legislation, in order to assess the degree of exposure to occupational risk factors present during normal working time.","PeriodicalId":234250,"journal":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies, VOL 22, ISSUE 4.2","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132793621","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 : 2022-12-27DOI: 10.5593/sgem2022v/4.2/s16.59
A. Kaglyan, D. Gudkov, S. Kireev, L. Yurchuk, M.A. Menkovska
The levels of specific activity of 90Sr and 137Cs in fish of one of the most polluted reservoirs of the Chornobyl Exclusion Zone (ChEZ) - Vershyna Lake. During the research period from 2011 to 2021 for all studied fish of the lake. The peak ranges of the specific activity of radionuclides are noted at the level of 32960-213300 (average value 67832-22936) Bq/kg for 90Sr and 838-25907 (4811-569) Bq/kg for 137Cs. It is shown that at the current stage, the specific activity of 90Sr in the ichthyofauna of the lake exceeds the permissible levels, which are accepted in Ukraine for fish products in more than 942-6094, and 137Cs - in 6-173 times. The 90Sr/137Cs ratio in lake fish is in the range of 3-108. The distribution of radionuclides in the organs and tissues of silver crucian carp is given. Estimated dose rate of fish irradiation of the Vershyna Lake. As shown by the results of studies of the ichthyofauna of Vershyna Lake , the maximum average dose rate irradiation was noted in representatives of bentophagous Prussian carp (149,5-12,1 ?Gy/h), the minimum - in the pelagic Sunbleak (56,2-5,1 ?Gy/h). It was noted, that 90Sr is the dominant radionuclide in the formation of the total radiation dose of fish from Vershyna Lake (in contrast to all other investigated reservoirs of the ChEZ).
{"title":"LEVELS OF RADIONUCLIDE CONTAMINATION OF FISH OF VERSHYNA LAKE IN THE CHORNOBYL EXCLUSION ZONE","authors":"A. Kaglyan, D. Gudkov, S. Kireev, L. Yurchuk, M.A. Menkovska","doi":"10.5593/sgem2022v/4.2/s16.59","DOIUrl":"https://doi.org/10.5593/sgem2022v/4.2/s16.59","url":null,"abstract":"The levels of specific activity of 90Sr and 137Cs in fish of one of the most polluted reservoirs of the Chornobyl Exclusion Zone (ChEZ) - Vershyna Lake. During the research period from 2011 to 2021 for all studied fish of the lake. The peak ranges of the specific activity of radionuclides are noted at the level of 32960-213300 (average value 67832-22936) Bq/kg for 90Sr and 838-25907 (4811-569) Bq/kg for 137Cs. It is shown that at the current stage, the specific activity of 90Sr in the ichthyofauna of the lake exceeds the permissible levels, which are accepted in Ukraine for fish products in more than 942-6094, and 137Cs - in 6-173 times. The 90Sr/137Cs ratio in lake fish is in the range of 3-108. The distribution of radionuclides in the organs and tissues of silver crucian carp is given. Estimated dose rate of fish irradiation of the Vershyna Lake. As shown by the results of studies of the ichthyofauna of Vershyna Lake , the maximum average dose rate irradiation was noted in representatives of bentophagous Prussian carp (149,5-12,1 ?Gy/h), the minimum - in the pelagic Sunbleak (56,2-5,1 ?Gy/h). It was noted, that 90Sr is the dominant radionuclide in the formation of the total radiation dose of fish from Vershyna Lake (in contrast to all other investigated reservoirs of the ChEZ).","PeriodicalId":234250,"journal":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies, VOL 22, ISSUE 4.2","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117350931","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 : 2022-12-27DOI: 10.5593/sgem2022v/4.2/s17.77
Z. Abelniece, Helle-Mai Piirsoo, H. Mandar, A. Tamm
The alternative way to solve the greenhouse gas emission problems is carbon dioxide (CO2) capture and utilization. CO2 hydrogenation is one of the routes to obtain valuable chemicals and fuels such as methanol. The effect of indium (In) promoter on catalytic system Cu/Zn/SBA-15 has been studied. 1%In/Cu/ZnO/SBA15 and 6%In/Cu/ZnO/SBA15 catalysts have been synthesized by impregnation method and compared with Cu/Zn/SBA-15 catalyst (the content of Cu 30 wt.% and the content of Zn 1.4 wt.%). All catalysts have been characterized using XRD analysis, N2 adsorptiondesorption analysis, SEM-EDX and STEM analysis. CO2 hydrogenation was proceeded in a fixed-bed tubular micro-activity reactor at 20 bar 250 -C with H2 to CO2 molar ratio 4 to 1. The addition of In showed positive effect on the structural and textural properties of catalyst, but the activity in hydrogenation reaction showed opposite - the largest space-time yield of methanol was obtained with Cu/Zn/SBA-15 catalyst.
解决温室气体排放问题的另一种方法是二氧化碳的捕获和利用。二氧化碳加氢是获得有价值的化学品和甲醇等燃料的途径之一。研究了铟(In)助剂对Cu/Zn/SBA-15催化体系的影响。采用浸渍法制备了1%In/Cu/ZnO/SBA15和6%In/Cu/ZnO/SBA15催化剂，并与Cu/Zn/SBA-15催化剂(Cu含量为30 wt.%， Zn含量为1.4 wt.%)进行了比较。采用XRD分析、N2吸附-脱附分析、SEM-EDX和STEM分析对催化剂进行了表征。在固定床管式微活性反应器中进行CO2加氢，反应温度为20 bar 250 c, H2与CO2的摩尔比为4:1。In的加入对催化剂的结构和织构性能有积极的影响，但对加氢反应的活性则相反，Cu/Zn/SBA-15催化剂的甲醇时空产率最大。
{"title":"THE EFFECT OF In PROMOTER ON Cu/ZnO/SBA-15 CATALYST STRUCTURAL PROPERTIES AND ACTIVITY FOR CO2 HYDROGENATION","authors":"Z. Abelniece, Helle-Mai Piirsoo, H. Mandar, A. Tamm","doi":"10.5593/sgem2022v/4.2/s17.77","DOIUrl":"https://doi.org/10.5593/sgem2022v/4.2/s17.77","url":null,"abstract":"The alternative way to solve the greenhouse gas emission problems is carbon dioxide (CO2) capture and utilization. CO2 hydrogenation is one of the routes to obtain valuable chemicals and fuels such as methanol. The effect of indium (In) promoter on catalytic system Cu/Zn/SBA-15 has been studied. 1%In/Cu/ZnO/SBA15 and 6%In/Cu/ZnO/SBA15 catalysts have been synthesized by impregnation method and compared with Cu/Zn/SBA-15 catalyst (the content of Cu 30 wt.% and the content of Zn 1.4 wt.%). All catalysts have been characterized using XRD analysis, N2 adsorptiondesorption analysis, SEM-EDX and STEM analysis. CO2 hydrogenation was proceeded in a fixed-bed tubular micro-activity reactor at 20 bar 250 -C with H2 to CO2 molar ratio 4 to 1. The addition of In showed positive effect on the structural and textural properties of catalyst, but the activity in hydrogenation reaction showed opposite - the largest space-time yield of methanol was obtained with Cu/Zn/SBA-15 catalyst.","PeriodicalId":234250,"journal":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies, VOL 22, ISSUE 4.2","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126126002","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 : 2022-12-27DOI: 10.5593/sgem2022v/4.2/s18.03
M. Sydykanov, Yerkin Bektay, Gaukhar Turysbekova, A. Baibatsha, Gurhan Yalcin
The lack of new deposits with a rich copper content and the depletion of old deposits, as well as the need to comply with environmental requirements, raises the issue of the need to process the tailings of metallurgical industries. In Kazakhstan was accumulated significant stocks of tailings "Borgezsay" and "Staroye". The tailings reserves are estimated at up to 1 billion tons. Sample evaluation showed that the average copper content in the tailings is 0.15-0.2%. More than 1 million tons of copper are stored in this tailings. The complexity of the structure of minerals passes through the process of leaching of these wastes. Several types of leaching in sulfuric acid were considered for processing. Methods using chalcopyrite as a catalyst or dissolution with chlorides were not economically efficient. Studies have been carried out on the use of copper bioleaching. Bioorganisms destroy various minerals of metals, ensures the transition of metals into the leaching solution. Thionic bacteria Acidithiobacillus ferrooxidans were used. The strains of these iron-oxidizing bacteria occupy an exceptional position among thionic bacteria, since in addition to the ability to autotrophic growth due to the oxidation of sulfur compounds, they can use the energy of oxidation of ferrous iron. Studies have shown that the use of these bacteria can reduce the copper content in samples from 0.2% till 0.05%, in some cases down to 0.005%. Bioleaching carried out on various tailings samples showed the effectiveness of this method.
{"title":"APPLICATION OF BIOLEACHING OF COPPER FLOTATION TAILINGS","authors":"M. Sydykanov, Yerkin Bektay, Gaukhar Turysbekova, A. Baibatsha, Gurhan Yalcin","doi":"10.5593/sgem2022v/4.2/s18.03","DOIUrl":"https://doi.org/10.5593/sgem2022v/4.2/s18.03","url":null,"abstract":"The lack of new deposits with a rich copper content and the depletion of old deposits, as well as the need to comply with environmental requirements, raises the issue of the need to process the tailings of metallurgical industries. In Kazakhstan was accumulated significant stocks of tailings \"Borgezsay\" and \"Staroye\". The tailings reserves are estimated at up to 1 billion tons. Sample evaluation showed that the average copper content in the tailings is 0.15-0.2%. More than 1 million tons of copper are stored in this tailings. The complexity of the structure of minerals passes through the process of leaching of these wastes. Several types of leaching in sulfuric acid were considered for processing. Methods using chalcopyrite as a catalyst or dissolution with chlorides were not economically efficient. Studies have been carried out on the use of copper bioleaching. Bioorganisms destroy various minerals of metals, ensures the transition of metals into the leaching solution. Thionic bacteria Acidithiobacillus ferrooxidans were used. The strains of these iron-oxidizing bacteria occupy an exceptional position among thionic bacteria, since in addition to the ability to autotrophic growth due to the oxidation of sulfur compounds, they can use the energy of oxidation of ferrous iron. Studies have shown that the use of these bacteria can reduce the copper content in samples from 0.2% till 0.05%, in some cases down to 0.005%. Bioleaching carried out on various tailings samples showed the effectiveness of this method.","PeriodicalId":234250,"journal":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies, VOL 22, ISSUE 4.2","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131359335","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 : 2022-12-27DOI: 10.5593/sgem2022v/4.2/s18.01
Merve Ergun
Taxation can be used as a tool to promote sustainable waste management and recycling of industrial plastic, paper and glass; therefore, this article aims to assess the effectiveness of existing waste taxes by considering their effects on waste generation and disposal in Europe. In this context, a comparative study has been carried out to understand taxpayers- behaviours towards waste taxation, tax rates and methods preferred to calculate the amount of tax to be paid. Sustainable waste management is of particular importance for countries and requires effective investment and financing mechanisms. It can be argued that today-s tax systems are asked to contribute to sustainable development by eradicating poverty, reducing inequalities and using tax incentives to limit the amount of waste produced. This also means that tax systems, from time to time, may require to take more proactive Pigouvian roles. Collection of waste tax is mostly under the responsibility of local authorities, and these authorities may opt different methods, such as: Unit-Based Pricing (UBP) and pay-asyou-throw (PAYT) schemes, while calculating the amount of tax to be collected. Pigouvian taxes intend to discourage consumption of products that affect society and/or environment hazardously; therefore, it is argued that the waste taxes that are not inconformity with the Pigouvian approach should be updated because waste taxes should not only finance the service taken by the users(taxpayers), but also promote recycling and protect the environment and human health.
{"title":"A COMPARATIVE STUDY ON THE TAXATION OF WASTE DISPOSAL IN EUROPE","authors":"Merve Ergun","doi":"10.5593/sgem2022v/4.2/s18.01","DOIUrl":"https://doi.org/10.5593/sgem2022v/4.2/s18.01","url":null,"abstract":"Taxation can be used as a tool to promote sustainable waste management and recycling of industrial plastic, paper and glass; therefore, this article aims to assess the effectiveness of existing waste taxes by considering their effects on waste generation and disposal in Europe. In this context, a comparative study has been carried out to understand taxpayers- behaviours towards waste taxation, tax rates and methods preferred to calculate the amount of tax to be paid. \u0000Sustainable waste management is of particular importance for countries and requires effective investment and financing mechanisms. It can be argued that today-s tax systems are asked to contribute to sustainable development by eradicating poverty, reducing inequalities and using tax incentives to limit the amount of waste produced. This also means that tax systems, from time to time, may require to take more proactive Pigouvian roles. \u0000Collection of waste tax is mostly under the responsibility of local authorities, and these authorities may opt different methods, such as: Unit-Based Pricing (UBP) and pay-asyou-throw (PAYT) schemes, while calculating the amount of tax to be collected. Pigouvian taxes intend to discourage consumption of products that affect society and/or environment hazardously; therefore, it is argued that the waste taxes that are not inconformity with the Pigouvian approach should be updated because waste taxes should not only finance the service taken by the users(taxpayers), but also promote recycling and protect the environment and human health.","PeriodicalId":234250,"journal":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies, VOL 22, ISSUE 4.2","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115176667","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 : 2022-12-27DOI: 10.5593/sgem2022v/4.2/s18.02
L. Klepo, Jelena Ostojić, Olga Borota, S. Zero, Dušan Čulum
Pyrophyllite was investigated in this study as a potential adsorbent for the removal of glyphosate, a common herbicide for the control of a wide variety of weeds. There are several publications in the literature that discuss how glyphosate interacts with clay minerals such as montmorillonite, kaolinite, and bentonite, but there is no information regarding the possibility of glyphosate removal from aqueous solution using pyrophyllite. In this study, the adsorption of glyphosate from water samples onto pyrophyllite, a mineral clay from the Parsovici, Konjic mine, was investigated. The ninhydrin reaction was used to spectrophotometrically quantify glyphosate. At 570 nm, the purple Ruhemman product's absorbance was determined. Adsorption capacity (qe), removal efficiency (R), and the partition coefficient are used to express the results (Kd). The outcomes demonstrated that distinct ionic species of glyphosate at different pHs cause the adsorption of glyphosate on pyrophyllite to be pH-dependent. The findings demonstrated that during different contact times, the basic medium can remove up to 75% of glyphosate. According to results from fitting isotherm models, the Freundlich model is slightly better fitted. According to the results of kinetic investigations, the pseudo-2nd order model is more suitable for this kind of adsorption.
{"title":"ADSORPTIVE REMOVAL OF GLYPHOSATE FROM AQUEOUS SOLUTION ONTO PYROPHYLLITE","authors":"L. Klepo, Jelena Ostojić, Olga Borota, S. Zero, Dušan Čulum","doi":"10.5593/sgem2022v/4.2/s18.02","DOIUrl":"https://doi.org/10.5593/sgem2022v/4.2/s18.02","url":null,"abstract":"Pyrophyllite was investigated in this study as a potential adsorbent for the removal of glyphosate, a common herbicide for the control of a wide variety of weeds. There are several publications in the literature that discuss how glyphosate interacts with clay minerals such as montmorillonite, kaolinite, and bentonite, but there is no information regarding the possibility of glyphosate removal from aqueous solution using pyrophyllite. In this study, the adsorption of glyphosate from water samples onto pyrophyllite, a mineral clay from the Parsovici, Konjic mine, was investigated. The ninhydrin reaction was used to spectrophotometrically quantify glyphosate. At 570 nm, the purple Ruhemman product's absorbance was determined. Adsorption capacity (qe), removal efficiency (R), and the partition coefficient are used to express the results (Kd). The outcomes demonstrated that distinct ionic species of glyphosate at different pHs cause the adsorption of glyphosate on pyrophyllite to be pH-dependent. The findings demonstrated that during different contact times, the basic medium can remove up to 75% of glyphosate. According to results from fitting isotherm models, the Freundlich model is slightly better fitted. According to the results of kinetic investigations, the pseudo-2nd order model is more suitable for this kind of adsorption.","PeriodicalId":234250,"journal":{"name":"22nd SGEM International Multidisciplinary Scientific GeoConference Proceedings 2022, Energy and Clean Technologies, VOL 22, ISSUE 4.2","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134150455","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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