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수록정보
수록범위 : 1권1호(2000)~22권5호(2021) |수록논문 수 : 1,143
한국환경기술학회지
22권5호(2021년 10월) 수록논문
최근 권호 논문
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KCI등재

1Selective Removal of Cesium Ion from Water by Ferro-hexacyanoferrate Immobilized Polyacrylonitrile Film

저자 : Jong-hyeon Jeong , Xiang-yu Li , Choon-ki Na

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 22권 5호 발행 연도 : 2021 페이지 : pp. 307-315 (9 pages)

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After the accident at Fukushima Nuclear Power Plant, the removal of cesium from water became an emerging issue. In this study, ferro hexacyanoferrate-polyacrylonitrile (FeHCF-PAN) film was prepared and used as a adsorbent for the removal of cesium from water. A batch adsorption experiments were systematically carried out to assess the effect of different parameters such as presence of competing cations, contact time, initial cesium concentration and temperature on the adsorption of cesium on FeHCF-PAN film. The presence of competing cations showed no adverse effect on cesium removal. Langmuir, Freundlich and Dubinin-Radushkevich isotherm models were fitted to the obtained experimental adsorption data and it was observed that the adsorption of cesium on the FeHCF-PAN film was better represented by the Langmuir model. The maximum monolayer adsorption capacity was found to be 76.92 mg/g at DIW and 100.0 mg/g at seawater, respectively. The pseudo-second-order kinetic model described well the kinetic data, and resulted in the activation energy of 24.02 kJ/mol, which indicate that the adsorption mechanism was chemisorption. Adsorption thermodynamic parameters such as ΔG°, ΔH° and ΔS° were calculated and showed that the adsorption of cesium is endothermic process and spontaneous in nature.

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2Economic Evaluation on Self Purification Capacity of the Tamnip Stone Weir Reservoir: Replacement Cost Approach Method

저자 : Ji Yeon Ryu , Chae-hun Hyun

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 22권 5호 발행 연도 : 2021 페이지 : pp. 316-329 (14 pages)

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This study investigates the changes in the concentration of pollutants before and after the removal of stone weir by using EFDC models. This paper analyzes the impact of Tamnip stone weir reservoir on the water quality of the main stream, which is directly affected by discharge water at the sewage treatment plant in Daejeon. This study further extends the field by performing replacement cost approach method to examine the economic benefits of water quality improvement. As a result of the EFDC model's level calibration, it was analyzed that the level of RMSE was 0.4 m, NRMSE 0.11, and NSEC 0.01, which were properly calibrated. Furthermore, for verification, the model was properly calibrated with RMSE 0.10 m, NRMSE 0.10 and NSEC 0.01. To evaluate the adequacy of the water quality model, calibration was performed using the water quality measurement data at the W-2 point once a month. Water temperature, COD, T-N, and T-P all four water quality items had an R2 value of 0.8 or higher and the NSEC was between 0 and 1, therefore it is reasonable to perform analysis using simulations. Replacement cost approach method is performed using alternative cost in order to evaluate environmental technology effect from the perspective of economic benefit. According to the analysis of the effect of the Tamnip stone weir on river water quality, the water quality tends to deteriorate in all items of COD, T-N, T-P, NH4-N, NO3-N, and PO4-P, although there are seasonal differences when the weir is removed. The reason for the water quality increase is because there was not enough time for biological self-purification during the Tamnip stone weir demolition. The significant increase in the water quality concentration from June to September is most likely due to the influence of temperature. Therefore, it is believed that removing the Tamnip stone weir located in the target section will have a significant impact on the water quality of the stream. In particular, the discharge water from the sewage treatment plant in Daejeon will be introduced within this section, which will have a positive effect on the water quality of the river. This study also sheds light on how economic benefits of environmental factors, such as water quality, could be measured by using replacement cost approach like alternative management facility or emission charges.

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An approximate analytical solution for the size distribution width of fine particles coagulating in the transition regime is derived. It is assumed that the particle size distribution can be represented by a time-dependent log-normal function, which passes through a series of quasi-self-preserving states. The solution extends a previous solution presented for the near-continuum regime to cover the whole transition regime by adopting Dahneke's collision kernel based on the flux-matching theory. Good agreement was obtained when the new solution was compared to numerical calculations. The effective degree of homogeneity of collision kernel is defined and used for a comprehensive analysis of the Knudsen number-dependent behavior of the quasi-self-preserving size distributions. Although the new solution is valid for the whole particle size range from the free-molecule regime (Knudsen number larger than ~50) through the transition regime (Knudsen number between ~1 and ~50) to the continuum regime (Knudsen number smaller than ~1), it is practically applicable in the transition regime because the self-preserving behavior in the continuum regime or in the free-molecule regime had previously been investigated and understood well.

KCI등재

4Removal of As(V) from Water Using Lanthanum Hydroxide

저자 : Xiang-yu Li , Jee-june Song , Choon-ki Na

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 22권 5호 발행 연도 : 2021 페이지 : pp. 337-343 (7 pages)

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This study was conducted to evaluate the usability of lanthanum hydroxide for arsenic removal from water. Batch adsorption experiments were performed to study the influence of various factors such as pH, contact time, initial arsenic concentration and presence of competing anions on arsenic adsorption by lanthanum hydroxide. Lanthanum hydroxide had a higher affinity for As(V) than As(III). Efficient As(V) removal was observed in the pHeq 4.0~8.0. The pseudo-second-order kinetic model and the Langmuir isotherm model described well the experimental data. The maximum monolayer adsorption capacity was found to be 125.0 mg/g. The adsorption energies of 16.00~16.28 kJ/mol indicate an ion exchange process as primary adsorption mechanism. The presence of competing anions, except for phosphate, did not significantly affect As(V) removal by lanthanum hydroxide. The As(V) adsorbed on lanthanum hydroxide could be desorbed with NaOH solution. The results of this study demonstrate the potential usability of lanthanum hydroxide as an excellent As(V) selective adsorbent.

KCI등재

5Application Effect of Water Quality HSPE & EPDC Models Used to Improve Water Quality in G lake

저자 : Hyun-joo Lee

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 22권 5호 발행 연도 : 2021 페이지 : pp. 344-352 (9 pages)

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In order to predict changes in water quality from pollutants and sewage treatment plants in Lake G located in Y-si, Gyeonggi-do, the water quality improvement project was carried out step by step using the HSPE model and EFDC (Environmental Fluid Dynamic) model. The data used in this study were carried out by correcting the model using water quality data from 2015 to 2017, and the impact was determined by investigating the sources of contamination flowing into Lake G, the subject of this study. Water quality improvement project items were applied to reduce discharge and concentration at G sewage treatment plant adjacent to G lake by 20 % compared to the current level, implement non-point pollution source reduction project, and implementation of G lake ecological river restoration project.According to the forecast, it is expected to have a great effect on the improvement of water quality by the expansion of facilities at sewage treatment plants into Lake G, maintenance of sewage pipes, non-point pollution sources, and restoration of ecological river restoration. It was set as COD and T-P as the representative items of water quality, and in case of irresponsibility, the water quality is continuously deteriorating every year. After implementing each step, the algae phenomenon of Lake G is expected to be reduced and the water quality improvement effect is expected.

KCI등재

6Efficient Control Methods for Greenhouse Gases from Domestic Sewage Treatment Facilities

저자 : Hong-kee Kim , Jee-june Song

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 22권 5호 발행 연도 : 2021 페이지 : pp. 353-361 (9 pages)

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In this study, we performed analysis to identify the effective method for suppression of Green House Gasses(GHGs) emissions from the public swage treatement plants. In particular, according to the IPCC guidelines, GHG emissions from public sewage treatment plants were calculated by dividing them by size and construction method. Among the methods investigated, the standard activated sludge method and the MEDIA method generated the least amount of greenhouse gas 0.000267 kgCO2-eq/㎥ and 0.000327 kgCO2-eq/㎥ respectively in the sewage treatment plant size of 10,000 ㎥ to 50,000 ㎥. On the other hand, the A2O and SBR methods generated the most greenhouse gas emissions at 50,000 ㎥~100,000 ㎥ of sewage treatment plants, respectively, with 254 kgCO2-eq/㎥ and 248 kgCO2-eq/㎥. In addition, we verify the BOD load was the largest influencing factor on the quantity of generated greenhouse gas at the sewage treatment plants, and the factor is followed by the facility capacity, the inflow flow and T-N load, and the power consumption.

KCI등재

7A Study on the Priority of Advancing Hydrogen Fueling Infrastructure Using AHP

저자 : Sungu Kim , Hyeok-ra Choi , Heaseon Kim , Seon-myung Kim

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 22권 5호 발행 연도 : 2021 페이지 : pp. 362-367 (6 pages)

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In this study, the solution to the problems raised in the hydrogen industry infrastructure construction was considered using the AHP analysis. This research model divided the major decision-making issues of hydrogen infrastructure construction into seven and evaluated the importance and priority of detailed items for each decision-making issue. The result of the analysis indicated that locations near existing gas stations were suitable for installing hydrogen refueling stations. To expand the supply of hydrogen refueling stations, safety concerns and acceptability of the refueling stations were evaluated as the biggest problems to be solved. It was evaluated that the location near the new mass demand was the most suitable location of the hydrogen production facility. Expanding public service advertisements related to hydrogen safety was found to be an appropriate technique for raising public awareness for the expansion of hydrogen infrastructure construction. Insufficient hydrogen infrastructure was evaluated as the most important factor for expanding the hydrogen industry ecosystem in Korea. Therefore, to expand the construction of hydrogen infrastructure, in addition to the subsidies for hydrogen vehicles, support policies from the government that guarantee a certain rate of return on the operation of hydrogen infrastructure facilities are necessary.

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8Physicochemical Analysis of Wastewater Sludge in Yeosu National Industrial Complex

저자 : Jong-gab Shin , Jee-june Song

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 22권 5호 발행 연도 : 2021 페이지 : pp. 368-374 (7 pages)

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In 1987, the national industrial complex began to build wastewater treatment facilities, and the Yeosu National Industrial Complex is a large-scale industrial complex in which Korea's representative heavy and chemical companies reside. In this study, in order to review the efficient sludge treatment method for the Jungheung Industrial Complex wastewater treatment plant as a research object, the physicochemical characteristics of the wastewater sludge were analyzed to examine ways to efficiently convert resources into resources. The Jungheung Wastewater Treatment Plant generated 9,200 tons/year of sludge in 2019, and the treatment cost was 1,253 million won per year. As a result of three components analysis of wastewater sludge, moisture was in the range of 70 to 91 %, and combustible matter was in the range of 5 to 19 %, and in the case of ash, it was in the range of 1 to 17 %. The average low calorific value of the subjects was 2,050 kcal/kg, and even within the same industry, the low calorific value was shown in the subjects with a low ratio of combustible powder and a relatively high content of ash. As a result of analysis of the five elements C, H, N, S, and O of wastewater sludge, the carbon value ranged from 3.17 to 49.72 %, and most subjects with high calorific value had high C content. There was no subject whose heavy metal content in the wastewater sludge exceeded the standard value. As a result of the analysis of inorganic elements, certain elements were found to be high depending on the characteristics of the industry, such as manganese cobalt (Co) being high in the petrochemical industry.

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9Efficiency Analysis of Environmental R&D Projects Using DEA and Malmquist Based on Integrated Efficiency Model

저자 : Kwang Hee Nam , Yong-sung Park

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 22권 5호 발행 연도 : 2021 페이지 : pp. 375-385 (11 pages)

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This paper evaluates the efficiency and productivity of the environmental R&D projects focused on the Next Generation Eco-Innovation Projects using data envelopment analysis (DEA) and Malmquist. Environmental R&D projects consist of 19 decision making units (DMU). Two input variables and three output variables are selected to evaluate them. Inputs are total funds and researchers. Outputs are patents, papers and revenues from the projects. This paper uses a two-stage approach. First, it measures the efficiency and productivity of the environmental research projects by using DEA and Malmquist. Second, it classifies 19 DMUs into 4 groups in terms of the integrated efficiency based on the scores of static efficiency and dynamic efficiency. Then it suggests that inefficient DMUs should be improved by benchmarking the efficient DMUs. This study is expected to provide government officials with policy implications about which environmental R&D projects are inefficient and how to improve their efficiency.

KCI등재

10Flood Risk Assessment in Consideration of Regional Characteristics

저자 : Yu-seong Lim , Byung-joon Lee , Yun-young Choi

발행기관 : 한국환경기술학회 간행물 : 한국환경기술학회지 22권 5호 발행 연도 : 2021 페이지 : pp. 386-396 (11 pages)

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In this study, the results from the analysis on the basic flood risk assessment items suggested in the long-term comprehensive plan for water resources were compared with the results from the analysis on the basic items and the index items added in consideration of regional characteristics of Gyeongsangbuk-do. The comparison results are summarized as follows. With the use of the flood risk assessment items suggested in the long-term comprehensive plan for water resources, the basic flood risk grades of the regions in Gyeongsangbuk-do were analyzed. The index items reflecting regional characteristics were added and then analyzed. The analysis results were compared. As a result of applying regional characteristics based on four conditions such as hydrology-geological, social-economic factors, flood control, and meteorological factors, the risk grades of many regions (about 30 %) were raised, but there was no significant change in the risk grades in the rest of the regions. When the index items that reflected regional characteristics were applied in the flood risk assessment, regions had different risk grades according to their regional characteristics in each factor. Therefore, such a method helped to suggest the direction of establishing improved water management measures.

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