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수록범위 : 1권1호(2000)~23권2호(2022) |수록논문 수 : 1,171
한국환경기술학회지
23권2호(2022년 04월) 수록논문
최근 권호 논문
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KCI등재

1Ethylene Glycol을 이용하여 폐 유기용제로부터 고순도 Methylene Chloride 회수를 위한 추출증류공정의 전산모사 및 공정 최적화

저자 : 강성진 ( Sung-jin Kang ) , 정병길 ( Byung-gil Jung )

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 2호 발행 연도 : 2022 페이지 : pp. 79-90 (12 pages)

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The purpose of this study was to investigate the simulation and optimization of extraction distillation process for recovery of high purity methylene chloride (MC) from waste organic solvent using ethylene glycol (EG). NRTL liquid activity coefficient model was adopted for phase equilibrium calculations and PRO/Ⅱ, a commercial process simulator, was used to simulate the extractive distillation process. Based on the analysis results, it turned out that the optimum feed stage for introducing raw materials (Waste organic solvent) into the extractive distillation column (T-01) is the 60th stage. As a result of analyzing the heat duty of re-boiler and the purity of MC, the MC recovery flow rate, the water concentration, etc. to select the optimum feed stage and the optimum inflow flow rate of ethylene glycol (EG), it turned out that the optimum feed stage of EG is the fifth stage and the optimum inflow flow rate of EG is 1,8000 kg/hr. As a result of analyzing the purity of MC and the recovery flow rate of MC according to the reflux ratio of the extractive distillation column (T-01), it was found that when the reflux ratio is 3.5, the purity of methylene chloride could be maintained 0.997 as mass fraction and the recovery flow rate of MC is maximum. As a result of analyzing the optimum feed stage for introducing the heavy stream flowing out from the bottom of the extraction solvent column (T-01) into the solvent recovery column (T-02), it turned out that the optimum feed stage of the heavy stream is the 60th stage. It was analyzed that the optimum distillate to feed ratio (D·F) of the solvent recovery column (T-02) was 0.10 and the optimum reflux ratio is 0.30, respectively.

KCI등재

2전기투석공정을 이용한 질산성 질소 분리

저자 : 고재언 ( Jae Eon Ko ) , 이정문 ( Jeong Moon Lee ) , 최태승 ( Tae Seung Choi ) , 심왕근 ( Wang Geun Shim )

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 2호 발행 연도 : 2022 페이지 : pp. 91-98 (8 pages)

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In this study, we evaluate the separation performance of nitrate from water in a recycling batch type electrodialysis (ED) process. In particular, the influences of several operating parameters including the applied current densities and the concentrate concentrations on the ED process performance such as concentrate and dilute concentration profiles, % separation, and energy consumption, were experimentally and theoretically investigated. The two dimensional (2D) batch type ED model based on the extended Nernst-Planck transport theory was used to systematically understand the mass transfer in the ion exchange membrane and the influence of operating conditions on the separation performance. Our results show that the 2D model including the water transport across the membrane is useful to validate the separation of nitrate in different experimental conditions and the concentration behaviors in the concentrate and dilute channels. In addition, the separation performance of nitrate is substantially dependent on the applied current compared to concentrated inlet concentrations.

KCI등재

3국가 석유화학 산업단지의 악취유발물질 배출특성에 관한 연구

저자 : 송승리 ( Seung-ri Song ) , 송재준 ( Jee-june Song )

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 2호 발행 연도 : 2022 페이지 : pp. 99-108 (10 pages)

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This study analyzes and collects data for two years from 2020 to 2021 and analyzes 578 odor test data from Yeosu, Ulsan, and Seosan. Based on the analysis data by time zone, region, location, etc, this study proposes practical measures suitable for petrochemical complexes by focusing on the odor generation environment and the characteristics of inducing substances. In the case of complex odors, the Yeosu National Industrial Complex exceeded the strict emission allowance standard by six times at two points in the management area, the Daesan Industrial Complex exceeded the standard twice in the management area and affected area, and the Ulsan Industrial Complex was within the standard. In the case of ammonia, the Yeosu Industrial Complex had a detection rate of about 70.4 % compared to the Ulsan Industrial Complex, more than twice the detection rate of the Ulsan Industrial Complex at about 31.4 %. Three items out of 22 designated odors were detected in the Yeosu Industrial Complex, five items were detected in the Ulsan Industrial Complex, and four types of aldehydes were detected in Daesan Industrial Complex. Except for one detection of i-butyl alcohol at the Ulsan Industrial Complex, it was judged that few items belonging to volatile organic compounds were detected. However, due to the nature of the petrochemical complex, volatile organic compounds have been reported several times, which requires real-time air pollutant measurement vehicles or operation of odor integrated control centers linked to workplaces to quickly analyze and identify responsibility. Designated odors, which are odor-causing substances and air pollutants that account for most of the emissions from the petrochemical industrial complex, are mainly composed of carbon. This study, which investigates and analyzes the concentration data of odor substances in Korea's three influential industries, aims to contribute to achieving the carbon neutral goal for zero carbon.

KCI등재

4해양 미세플라스틱 저감 방안 연구 - 환경 거버넌스를 중심으로 -

저자 : 남명숙 ( Myoung-sook Nam ) , 윤권감 ( Kwon-gam Yun ) , 이승원 ( Seung-won Lee )

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 2호 발행 연도 : 2022 페이지 : pp. 109-114 (6 pages)

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This study focused on environmental governance to reduce marine micro plastics. In the last 5 years, marine debris was generated in the order of coast > sedimentation > floating debris. In addition, 70,840 tons of marine debris was collected in 2016, but it is increasing to 138,362 tons in 2020. Currently, marine debris monitoring research is being conducted mainly on the coast of Korea, but since microplastics can affect marine life and items produced on the coast, we suggest diversifying monitoring. And the measures to reduce styrofoam buoy waste are as follows. Introduce a systematic and sustainable education system that can make fishery workers aware of the problem of waste dumped into the sea and the seriousness of marine pollution.

KCI등재

5통계적 추론을 통한 코로나 19 팬데믹 이후 서울의 이산화황(SO2) 오염 패턴 비교 연구

저자 : 장석호 ( Seok Ho Chang ) , 이순희 ( Soonhui Lee )

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 2호 발행 연도 : 2022 페이지 : pp. 115-124 (10 pages)

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Sulfur dioxide (SO2) is a colorless and highly toxic gas that is emitted during the combustion of compounds containing sulfur (S). It can also occur naturally during volcanic eruptions. SO2 is widely recognized as a toxic air pollutant and is one of the causative substances affecting the generation of secondary ultrafine dust such as particulate matter 2.5 (PM2.5). Our previous study (Chang & Lee, 2022) presents the observations on the recent changes in nitrogen dioxide (NO2) pollution in Seoul before and after the COVID-19 pandemic. This paper compares the average monthly SO2 densities in Seoul before and after the COVID-19 pandemic. The analysis produced the following results: (i) The average monthly SO2 density in Seoul decreased significantly in 2020 compared to that before the COVID-19 pandemic; (ii) The average difference in the SO2 monthly density in Seoul in the period from January 2021 to December 2021 and that from January 2020 to December 2020 is not statistically significant. In contrast to the studies that limit their discussions to average values, as that presented in a report by the Ministry of Environment in the Republic of Korea, the analyses of this study produced statistically valid results. These results could be partly interpreted as the effects of the partial resumption of the suspended non-industrial combustion plants in Seoul after the first half of 2020. Furthermore, the paper observes that the order-of-magnitude of the sample variances of monthly SO2 density in Seoul during recent three years (2021, 2020, and 2019) is -7. Finally, implications of the findings are delineated.

KCI등재

6경남지역의 의료시설과 보육시설의 실내공기질 실태조사

저자 : 최윤희 ( Yun-hee Choi ) , 김승연 ( Seung-yeon Kim ) , 박지인 ( Ji-in Park ) , 손현근 ( Hyun-keun Son ) , 류재용 ( Jae-yong Ryu )

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 2호 발행 연도 : 2022 페이지 : pp. 125-132 (8 pages)

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People in the health-sensitive class may have higher risk because they have more indoor living time and are sensitive to exposure and response than those who engage in normal outside activities. Therefore, research was conducted to comfortably maintain and manage the indoor environment of the sensitized facilities. The purpose of this study is to provide basic data on the harmfulness evaluation of Inje and efficient indoor air quality management plan by selecting childcare facilities and medical facilities in Gyeongnam to measure and analyze the concentration of six pollutants. In order to carry out the purpose of this study, 81 institutions of childcare facilities and 77 institutions of medical facilities were measured and analyzed in 2020. For one year in 2020, a total of 77 medical facilities and 81 childcare facilities among multi-use facilities in Gyeongsangnam-do were measured for maintenance and recommendation standards, and the results were analyzed as average values. In order to make management more consistent, the maintenance standard is once a year and the recommendation standard is once every two years, but in the future, we will propose a plan to increase the number of times and strengthen it to expose less exposure.

KCI등재

7하수관로 정비지역내 하수의 수집, 이송단계 적정성 검토

저자 : 조영희 ( Young-hee Cho ) , 신정섭 ( Jung-sub Shin ) , 정진도 ( Jin-do Chung )

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 2호 발행 연도 : 2022 페이지 : pp. 133-140 (8 pages)

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In this study, To identify the problems in the sewer pipeline maintenance project area and to come up with an improvement plan, 3 major indirect indicators were derived for the effect of WWTP effluent, the effect of the WWTP in separate sewer system, and the sewer pipe line maintenance. It was applied to the review of the appropriateness of the local sewage collection and transfer stage. In addition, the problems were verified by analyzing the operation status of sewage facilities in 4 areas with an indirect index application score of 60 or more, and conducting a flow rate and water quality survey and an internal sewage pipe survey. As a result of the analysis, the influent flow from June to September was 11 to 14 % higher than in the dry season, and the influent water quality(BOD5) was 5 to 17 % lower. In addition, the sections where low-concentration sewage flows in the area were confirmed. As a result, it was judged that low-concentration sewage was introduced as a large amount of I/I flowed in, as there were an average of 93 structural defects and an average of 5 faults due to the aging of the sewage pipe. As such, it was derived that the correlation was high with the problems of the sewer pipeline maintenance project in the area where the problem was expected through indirect indicators.

KCI등재

8드론을 이용한 고농도 대기오염물질 배출원 추적 연구

저자 : 신현준 ( Hyun-jun Shin ) , 서현정 ( Hyun-jeong Seo ) , 박승준 ( Seung Joon Park )

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 23권 2호 발행 연도 : 2022 페이지 : pp. 141-145 (5 pages)

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In this study, the air quality of 3 areas (25 m, 50 m and 75 m) of Namdong Industrial Complex was measured by mounting a sensor capable of measuring particulate matter(PM) on a drone. As a result of the measurement, The measured value of area 1 and area 2 was measured 30 ~ 40 μg/㎥ higher than the average of 31.5 μg/㎥ of the national air pollutant measurement network. Area 3 showed similar values to the national air pollutant measurement name. Area 3 was measured similarly to the regional average PM2.5 concentration in the air. Based on the measurement results, after inspecting the air pollutant emission workplaces in the area, It was confirmed that the prevention facilities were damaged at the workplaces located in area 1 and area 2. There were no violations in area 3. Through this study, it was concluded that if it is possible to track and inspect a workplace with a high concentration of PM by measuring the sky over the workplace using a drone, it will be possible to efficiently track a workplace with a high concentration of PM. If the workplace is inspected in this way, it will be possible to lower the concentration of air pollutants in the area.

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