Journal of Korean Society of Environmental Engineers最新文献

{"title":"Measures to Create an Eco-friendly Business Management Environment through Greenwashing Case analysis","authors":"Jeongmin Lee, Goeun Jang, Seunghee Jin, Chaeyun Hwang, Sokhee P. Jung","doi":"10.4491/ksee.2023.45.10.441","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.10.441","url":null,"abstract":"As environmental problems such as climate and resource depletion are seriously occurring worldwide, the climate crisis and environmental problems are drawing attention throughout society. Reflecting this reality, an increasing number of ESG management companies are promoting environmentally friendly products and conducting eco-friendly marketing to secure corporate competitiveness. Unfortunately, however, greenwashing marketing by companies that exploit society's preference for eco-friendly companies is also rapidly increasing. Greenwashing refers to camouflage environmentalism that is not actually environmentally friendly but appears to be environmentally friendly. Through this review, we will find out the beginning and meaning of greenwashing and try to explain the seriousness of greenwashing through cases of greenwashing that occurred in the aspects of the country, companies, and consumers. The trend of global regulation on greenwashing was examined, and through this, policy measures to suppress greenwashing were presented.","PeriodicalId":16127,"journal":{"name":"Journal of Korean Society of Environmental Engineers","volume":"6 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135979178","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}

{"title":"Longitudinal Connectivity Evaluations along with Chemical Water Quality and Biological Integrity analyses Based on Fish Multi-metric Model in Tan Stream","authors":"Hyeji Choi, Seo Jin Ki, Hyuk Je Lee, Dae-Yeul Bae, Kwang-Guk An, Ji Yoon Kim, Sang-Hyeon Jin, Min Jae Cho","doi":"10.4491/ksee.2023.45.10.416","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.10.416","url":null,"abstract":"The main objectives of this study were to evaluate biological integrity analysis and longitudinal connectivity assessment in Tan Stream. The research included the analysis of chemical water quality, ecological health assessment based on fish, and a comparison of aquatic ecosystem health before and after restoration, following the removal of two weirs (Baekgung weir and Baekhyeon weir) among the nine weirs with five fishways. Additionally, an assessment of longitudinal connectivity is being conducted. Dissolved oxygen (DO), biological oxygen demand (BOD), total organic carbon (TOC), total nitrogen (TN), total phosphorus (TP), and suspended solids (SS) concentrations were not high based on the criteria of the Ministry of Environment, Korea. The ecological health assessment based on fish showed an average health grade of “Fair (C)”, indicating a partial deterioration of ecological health, with <i>Zacco platypus</i> as the dominant species. The results of the regression analysis showed that there was no significant correlation between water quality and ecological health (<i>p</i> > 0.05). After the removal of Baekgung weir, the health of the aquatic ecosystem (FAI) improved slightly, increasing from “50” to “56.25”. And after the removal of Baekhyeon weir, the value remained the same as before the removal (“56.25”). However, it was found that the overall improvement effect on the entire Tan Stream was minimal. The evaluation of longitudinal connectivity revealed, three continuities, two partial continuities and two discontinuities at the artificial weir unit level, while at the stream unit level, it was evaluated as “continuous (52.8%)”. Further comprehensive research is needed to investigate the potential impact of artificial structures on the integrity of the aquatic ecosystem.","PeriodicalId":16127,"journal":{"name":"Journal of Korean Society of Environmental Engineers","volume":"41 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135978979","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}

{"title":"Evaluating Biogas Production of Polylactic acid with the addition of Conductive Materials","authors":"Jung-Sup Lee, Tae-Hoon Kim, Yeo-Myeong Yun","doi":"10.4491/ksee.2023.45.10.409","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.10.409","url":null,"abstract":"Objectives:The demand for polylactic acid (PLA) is increasing as an alternative to conventional petroleum-based plastics due to its eco-friendly characteristics. PLA can be processed through anaerobic digestion (AD) along with other organic wastes to promote efficient and controlled biodegradation. This study aimed to evaluate the feasibility of biogas production through AD of PLA and to enhance efficiency through the addition of conductive materials.Methods:Two sets of biochemical methane potential (BMP) tests were conducted. The first BMP test involved substrate/inoculum ratios (SIRs) of 0.6, 0.8, 1.0, 1.2, 1.4, and 1.6 (g COD PLA/g COD seed sludge). Conductive materials powdered activated carbon (PAC), carbon nanotube (CNT), and Magnetite were individually added to reactors at a concentration of 3 g/L in the second test.Results and Discussion:The study revealed an increasing trend in methane production and methane yield with higher levels of PLA input. However, a decline in methane yield was observed when PLA was injected at levels surpassing 35g COD/L. This phenomenon can be attributed to a prolonged Lag phase, indicating a longer adaptation period for microorganisms, consequently resulting in a reduction of the conversion rate from 1g COD substrate to methane. The introduction of conductive material led to elevated cumulative methane production and methane yield in comparison to the control group. Notably, Magnetite exhibited the highest increase rate among the tested materials. Additionally, the addition of PAC demonstrated favorable results in terms of methane production rate at 99.4mL/L/Day and a Lag phase of 5.7 days. Conclusion:Experiments were conducted to evaluate the effects of PLA biogas production and the injection of PAC, CNT, and Magnetite at various substrate/inoculum ratios. When PLA was used as a substrate for anaerobic digestion, its feasibility was confirmed. However, it exhibited lower efficiency compared to other substrates. Therefore, the addition of a conductive material was found to increase the biogas production efficiency.","PeriodicalId":16127,"journal":{"name":"Journal of Korean Society of Environmental Engineers","volume":"11 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135979176","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}

{"title":"Measures to Promote Energy Prosumer in Photovoltaic Solar Energy","authors":"Jueon Kim, Jinbin Son, Yunwoo Shin, Jaehyu Im, Sokhee P. Jung","doi":"10.4491/ksee.2023.45.10.428","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.10.428","url":null,"abstract":"In the process of implementing and trying various measures to achieve carbon neutrality around the world, Korea is also presenting various policies to advance to a low-carbon economy. Energy prosumer is a consumer who produces electricity directly and sells surplus electricity after consumption through an electric power company. Currently, advanced countries such as the U.S. and Germany are developing various business models beyond the initial energy prosumer model. However, in Korea, it is difficult for individuals to directly participate in the electricity market and buy and sell electricity due to policy limitations and complex reasons. In addition to these problems, low electricity bills and relatively high solar power prices are factors that hinder energy prosumers. Basically, in order for energy prosumers to be activated, the unit price of solar power must be lower than the unit price of electricity bill. In addition, an electricity market must be formed in which individuals can freely trade, and policies and legislation must be prepared to support them. If such a step is prepared to revitalize energy prosumers, energy self-sufficiency will be possible and a new energy industry will be established. Ultimately, decentralized resource systems such as smart grids are activated, enabling carbon neutrality. As the unit price of solar power in Korea has fallen and electricity bills are on the rise, energy prosumer’s prospects are positive. If the electricity bill system is implemented first through restructuring of the electricity industry, it will be possible to establish the energy prosumer system in Korea while trying to develop various energy prosumer business models and transaction methods.","PeriodicalId":16127,"journal":{"name":"Journal of Korean Society of Environmental Engineers","volume":"41 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135978973","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}

{"title":"Synergistic Production of Hypochlorite and Hydrogen through PEM Water Electrolysis","authors":"Donghyeon Lee, Mi-Jin Choi, Mi Jeong Park, Jongkwan Park","doi":"10.4491/ksee.2023.45.9.400","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.9.400","url":null,"abstract":"Objectives : This study aims to assess the feasibility of simultaneously producing hydrogen and hypochlorous acid using a 2-compartment PEM water electrolysis cell with an installed membrane electrode assembly (MEA).Methods : External power was applied to the PEM water electrolysis device through a potentiostat to induce the electrolysis reaction and to confirm the production of hydrogen and hypochlorite simultaneously. Linear Sweep Voltammetry (LSV) experiments were conducted, thereby determined the minimum voltage required for the electrolysis. Constant current experiments were performed by applying a fixed current of 1 A for 1 hour, measuring voltage changes every second to evaluate the stability and efficiency of hydrogen production. The hydrogen production rate was measured using a mass flow meter, while the hypochlorite production was determined using a portable free chlorine photometer.Results and Discussion : In this study, the minimum voltage required for hydrogen generation in a PEM water electrolysis cell was investigated using LSV with Deionized (DI) water. The results showed that the current increased from around 1.4 V, indicating an approximate voltage efficiency of 82%. NaCl was introduced to the anode in the PEM electrolysis cell to induce electrochemical reactions. When the anolyte was NaCl, the voltage was observed to increase by 0.77 V compared to using DI water. Optimization experiments were conducted to investigate the influence of electrolyte concentration and flow rate on hypochlorite and hydrogen production. As the electrolyte concentration increased, the hypochlorite generation also increased, with a maximum of 104±0.50 mg/L observed with NaCl 10 g/L. Additionally, when the flow rate was reduced, the hypochlorite production increased, and at a reduced flow rate of 5 mL/min compared to 20 mL/min, hypochlorite generation increased by 127.3%. However, the hydrogen production showed no significant variation with NaCl concentration or flow rate.Conclusion : This study explores a novel approach using PEM water electrolysis technology to simultaneously produce hydrogen and chlorinated disinfectants. The research employed a PEM electrolysis cell with the MEA to generate both chlorine-based compounds and hydrogen. By varying the concentration and flow rate of the anolyte, the production efficiencies of hypochlorite were compared. This system showed that PEM electrolysis can be a promising alternative for disinfection and energy production in terms of environmental protection and cost-effectiveness.","PeriodicalId":16127,"journal":{"name":"Journal of Korean Society of Environmental Engineers","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135039819","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}

{"title":"Characteristics of Ammonia Emissions from the use of Compost manure and Composite Fertilizer in Upland Field","authors":"Yeon-Jin Lee, Eun-Chae Im, Sung-Chang Hong, Seong-Jik Park","doi":"10.4491/ksee.2023.45.9.388","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.9.388","url":null,"abstract":"Objectives : This study aimed to monitor ammonia volatilization in upland fields under different nitrogen fertilizer applications, comparing compost manure (CM) and composite fertilizer (CF) and investigate the environmental factors influencing ammonia volatilization.Methods : Ammonia was collected using the static chamber method in upland fields, and the soil analyses were conducted before and after ammonia volatilization monitoring. Pearson's correlation analysis and machine learning were utilized to determine the relationship between ammonia volatilization and environmental factors. Growth characteristics of harvested crops were analyzed, and Duncan analysis confirmed significant differences between nitrogen fertilizer treatments.Results and Discussion : In both CM and CF fertilized fields, there was no significant difference in ammonia volatilization. However, more ammonia volatilization was observed in the potato field compared to the Chinese cabbage field, attributed to higher NH₄⁺-N content in the soil of the potato field. Machine learning identified soil temperature and moisture as significant factors affecting ammonia volatilization. The analysis of crop growth revealed a positive effect of increased nitrogen fertilizer application. The result showed that single CM application was insufficient to meet crop nutrient demands.Conclusion : This study quantified ammonia emissions, identified influencing factors, and provided valuable data for enhancing fertilizer use efficiency and nitrogen management strategies in agriculture.","PeriodicalId":16127,"journal":{"name":"Journal of Korean Society of Environmental Engineers","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135039978","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}

{"title":"Effective Policies Derived from Case analysis of Environmental Factors in ESG Management","authors":"Yukyeong Kim, Jiyun Byeon, Yuna Jeong, Seoeun Choi, Sokhee P. Jung","doi":"10.4491/ksee.2023.45.9.371","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.9.371","url":null,"abstract":"The modern society is developing rapidly, and humanity is facing unprecedented environmental pollution, global warming, climate change and various environmental problems. As a result, companies, a key social organization in modern capitalist society, are increasingly taking environmental and social responsibility. ESG management is an enterprise management that emphasizes non-financial factors (environment, society and corporate government). Recently, ESG considerations have become increasingly important in corporate management and investment. In preparation for this situation, companies are continuously releasing sustainability report to improve internal systems and build systems. As society is paying keen attention to ESG management, the number of actual management cases is increasing. However, in proportion to this interest, cases of greenwashing, which can be called fake eco-friendly marketing, have also been discovered, such as eco-friendly products or exaggerated carbon emission reductions. Accordingly, the comprehensive review examined cases of environmental factors in ESG management for overseas evaluation agencies that provide ESG management and related standards. In addition, a plan was proposed to establish sustainable corporate management using comprehensive domestic evaluation criteria.","PeriodicalId":16127,"journal":{"name":"Journal of Korean Society of Environmental Engineers","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135040117","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}

{"title":"Improving Stormwater Runoff Quality using Wasted activated Carbon from a Household Water Purifier","authors":"Seoyoon Choi, Yu Jeong Shin, Byeongmin Chae, Seoyeon Mo, Moon-Hyon Hwang, Do Gyun Lee","doi":"10.4491/ksee.2023.45.5.267","DOIUrl":"https://doi.org/10.4491/ksee.2023.45.5.267","url":null,"abstract":"Objectives : To recycle the wasted activated carbon from water purifiers and reuse stormwater runoff, this study evaluated water quality of stormwater runoff with regeneration using granular activated carbon containing commercial activated carbon for water treatment and wasted activated carbon from household water purifiers.Methods : The removal of total coliforms, chloride, BOD, T-N, T-P, turbidity, and pH in stormwater runoff were analyzed by down-flow column test using granular activated carbon with varied mixing ratios. In addition, chemical modification with ferrous sulfate and ultrasonic treatment were conducted to improve the removal efficiency of total coliforms, and turbidity.Results and Discussion : The optimal mixing ratio of granular activated carbon was 7:3 (GAC:WGAC), which showed high removal efficiency of 88.2% for total coliforms, 70.8% for chloride, 72.6% for BOD, 88.4% for T-N, 50.7% for T-P, and 85.9% for turbidity. The granular activated carbon with surface modification using a 0.2 M FeSO₄ solution with ultrasonic treatment demonstrated the highest removal efficiency, with a reduction of 11.8% in total coliforms, 29.2% in chloride, 12.1% in BOD, 20.3% in T-P, and 13.2% in turbidity, while T-N showed a decrease of 19.4% in removal efficiency.Conclusion : The granular activated carbon with a 7:3 mixing ratio showed highest removal efficiencies for all water quality parameters, while the total coliforms and turbidity did not meet the water quality standards for reclaimed water. This indicated that further physicochemical surface modification with FeSO₄ and ultrasonic treatment was needed to improve the removal performance and meet the water quality standards for reclaimed water. This approach explored in this study using wasted activated carbon should be continued in the area of resource and water circulation to properly utilize resources of wastes.","PeriodicalId":16127,"journal":{"name":"Journal of Korean Society of Environmental Engineers","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135394974","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}