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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Society of Environmental Engineers
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Journal DOI :
Korean Society of Environmental Engineering
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Volume & Issues
Volume 34, Issue 12 - Dec 2012
Volume 34, Issue 11 - Nov 2012
Volume 34, Issue 10 - Oct 2012
Volume 34, Issue 9 - Sep 2012
Volume 34, Issue 8 - Aug 2012
Volume 34, Issue 7 - Jul 2012
Volume 34, Issue 6 - Jun 2012
Volume 34, Issue 5 - May 2012
Volume 34, Issue 4 - Apr 2012
Volume 34, Issue 3 - Mar 2012
Volume 34, Issue 2 - Feb 2012
Volume 34, Issue 1 - Jan 2012
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Nitrogen and Phosphorus Removal Efficiency of Aluminum Usage in DEPHANOX Process
Lee, Beom ; Park, Noh-Back ; Tian, Dong-Jie ; Heo, Tae-Young ; Jun, Hang-Bae ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 5, 2012, Pages 295~303
DOI : 10.4491/KSEE.2012.34.5.295
Removal of total nitrogen (T-N) and total phosphorus (T-P) was evaluated in a DEPHANOX process by adding Al(III) to the separator to maintain T-P in the final effluent below 0.2 mg/L. pH in each reactor was maintained 7~8 after addition of Al(III) to the levels of 5, 10, 15 mg/L. The removal efficiency of COD and T-N decreased at higher Al(III) dose, but T-P removal efficiency increased from 76.28 to 84.02, 94.66% at Al(III) dose of 5, 10, 15 mg/L, respectively. T-P in effluent showed 0.17 mg/L at Al(III) dose of 15 mg/L. Minimum 15 mg/L of Al(III) was required to maitain T-P below 0.2 mg/L in the final effluent.
Biological Dechlorination of Chlorinated Ethylenes by Using Bioelectrochemical System
Yu, Jaecheul ; Park, Younghyun ; Seon, Jiyun ; Hong, Seongsuk ; Cho, Sunja ; Lee, Taeho ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 5, 2012, Pages 304~311
DOI : 10.4491/KSEE.2012.34.5.304
Chlorinated ethylenes such as perchloroethylene (PCE) and trichloroethylene (TCE) are widely used as industrial solvents and degreasing agents. Because of improper handling, these highly toxic chlorinated ethylenes have been often detected from contaminated soils and groundwater. Biological PCE dechlorination activities were tested in bacterial cultures inoculated with 10 different environmental samples from sediments, sludges, soils, and groundwater. Of these, the sediment using culture (SE 2) was selected and used for establishing an efficient PCE dechlorinating enrichment culture since it showed the highest activity of dechlorination. The cathode chamber of bioelectrochemical system (BES) was inoculated with the enrichment culture and the system with a cathode polarized at -500 mV (Vs Ag/AgCl) was operated under fed-batch mode. PCE was dechlorinated to ethylene via TCE, cis-dichloroethylene, and vinyl chloride. Microbial community analysis with polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) showed that the microbial community in the enrichment culture was significantly changed during the bio-electrochemical PCE dechlorination in the BES. The communities of suspended-growth bacteria and attached-growth bacteria on the cathode surface are also quite different from each other, indicating that there were some differences in their mechanisms receiving electrons from electrode for PCE dechlorination. Further detailed research to investigate electron transfer mechanism would make the bioelctrochemical dechlorination technique greatly useful for bioremediation of soil and groundwater contaminated with chlorinated ethylenes.
Development and Validation of Multiple Regression Models for the Prediction of Effluent Concentration in a Sewage Treatment Process
Min, Sang-Yun ; Lee, Seung-Pil ; Kim, Jin-Sik ; Park, Jong-Un ; Kim, Man-Soo ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 5, 2012, Pages 312~315
DOI : 10.4491/KSEE.2012.34.5.312
In this study, the model which can predict the quality of effluent has been implemented through multiple regression analysis to use operation data of a sewage treatment plant, to which a media process is applied. Multiple regression analysis were carried out by cases according to variable selection method, removal of outliers and log transformation of variables, with using data of one year of 2011. By reviewing the results of predictable models, the accuracy of prediction for
of treated water of secondary clarifiers was over 0.87 and for T-N was over 0.81. Using this model, it is expected to set the range of operating conditions that do not exceed the standards of effluent quality. In conclusion, the proper guidance on the effluent quality and energy costs within the operating range is expected to be provided to operators.
VOC/HAPs Emission Characteristics & Adsorption Evaluation for Paint Products in Busan Area
Song, Bok-Joo ; Lee, Seung-Min ; Cho, Gab-Je ; Cho, Jeong-Gu ; You, Pyung-Jong ; Kim, Gi-Gon ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 5, 2012, Pages 316~325
DOI : 10.4491/KSEE.2012.34.5.316
In this study, we suggested adequate control technology by analyzing emission process and main chemical of VOC/HAPs generated from four paint factories in Busan area. And we estimated whether Kapok fiber, which is a natural material, can be commercially used for an absorbent by testing adsorption ability. As a result of this sturdy, above 60% of VOC/HAPs was volatilized and dispersed inside the working place without conducting control system of facilities during manufacturing paints. Concentration profile of VOC/HAPs, which is volatile naturally outside the factories, is surveyed above 70% at Toluene, Ethylbenzene, and Xylene. And a result of evaluation of odor attribution level about the component whose Odor Threshold is known, it is estimated that major cause material of A, B, C factories is Toluene and that of D factory is m/p-Xylene. And that result presented design arguments such as facilities specifications, activated carbon filling volume, and replace cycle of activated carbon as control technology. Also, that result presented emission process improvement such as adsorption of central-controlled ventilation device, installation of inlet flenge, and potable cleaning process. The rate of pollutant adsorption of Kapok fiber, which is natural material, is indicated about 91.9%, 66.7%. That result validated the possibility as replacement of activated carbon.
Study on Concentrations and Mass Flows of Perfluorinated Compounds (PFCs) in a Wastewater Treatment Plant
Park, Jong-Eun ; Kim, Seong-Kyu ; Oh, Jung-Keun ; Ahn, Sung-Yun ; Lee, Mi-Na ; Cho, Chon-Rae ; Kim, Kyoung-Soo ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 5, 2012, Pages 326~334
DOI : 10.4491/KSEE.2012.34.5.326
To determine the concentrations and the mass flow of selected 10 perfluorinated compounds (PFCs), a field study was conducted in a wastewater treatment plant. Raw influent, primary influent, primary effluent, aeration tank effluent, secondary effluent, final effluent, dehydration liquor, primary sludge, thickened sludge, final sludge were collected over 3 days in the summer and the winter respectively. Collected samples were equally mixed and then served as an analytical sample. Total 10 compounds were analyzed. In terms of treated water, the concentration of perfluorooctanesulfonate (PFOS) and perfluorooctanoate (PFOA) were in range of N.D.~26.29 ng/L and N.D.~38.15 ng/L respectively. Perfluorononanoate (PFNA) and perfluorohexanesulfonate (PFHxS) were ranged from N.D. to 36.79 ng/L and from N.D. to 24.36 ng/L. In terms of sludges, a concentration of PFOS, PFOA, and perfluorodecanesulfonate (PFDS) were detected from 6.82 to 59.37 ng/g, from 0.13 to 0.37 ng/g, from N.D. to 0.83 ng/g respectively. Mass loading for PFCs increased during wastewater treatment except for PFNA. The observed increase in mass flow of PFCs may have resulted from biodegradation of precursor compounds.
Study on Contration Distribution of HCB and DDTs in River Sediments of Korea
Park, Jong-Eun ; Lee, Sang-Chun ; Hong, Jong-Ki ; Kim, Jong-Guk ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 5, 2012, Pages 335~344
DOI : 10.4491/KSEE.2012.34.5.335
Hexachlorobenzene (HCB) and Dichloro-Diphenyl-Trichloroethane (DDT) were determined in surface sediments collected from main rivers of Korea. Concentration of HCB in sediments ranged from 0.41 to 3.82 (average 1.58) ng/g, 0.08 to 6.09 (average 0.90) ng/g, 0.02 to 0.97 (average 0.30) ng/g, 0.28 to 0.59 (average 0.42) ng/g and 0.23 to 0.48 (average 0.32) ng/g in Han river, Nakdong river, Geum river, Yeongsan and Seomjin river respectively. The DDTs concentration was ranged from 0.67 to 14.20 (average 4.76) ng/g, N.D. to 10.36 (average 1.81) ng/g, N.D. to 7.26 (average 1.87) ng/g, N.D. to 3.12 (average 1.08) ng/g and 0.02 to 2.04 (average 0.56) ng/g in Han river, Nakdong river, Geum river, Yeongsan and Seomjin river respectively. In comparison with the concentration of HCB and DDTs in other studies, the values in sediments of this study were lower than those of other countries. Comparison with that Sediment quality guideline (SQG) of National Oceanic and Atmospheric Administration (NOAA), the HCB levels of this study were very lower than Effect Range Low (ERL) value. In the case of DDTs, the concentrations of 46 points were higher than ERL (1.58 ng/g). It have not harmful effect on ecosystem of the sediment, however ongoing monitoring of sediments is deemed necessary.
Asbestos Exposure and Health Risk Assessment for the Residents Near the Abandoned Mining Area in Chungbuk, Korea
Shin, Jin-Ho ; Oh, Seok-Ryul ; Hwang, Soon-Yong ; Chung, Sook-Nye ; Kim, Ji-Hui ; Nam, Eun-Jung ; Lee, Jin-Hyo ; Choi, Hee-Jin ; Eom, Seok-Won ; Chae, Young-Zoo ; Park, Chul-Hwi ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 5, 2012, Pages 345~350
DOI : 10.4491/KSEE.2012.34.5.345
To investigate the exposure and health risk assessment for the residents near the D-asbestos mine in Chungbuk, Korea. We analyzed asbestos in the 20 ambient air and 23 activity based samples near the mine. The airborne sample results are showed that 8 of 20 samples ranged between 0.0025 to 0.0029 f/cc (fiber per cubic centimeter) and the others were below the detection limit by phase contrast microscopy (PCM). In addition, asbestos fibers were under the detection limit or not being by transmission electron microscopy (TEM). Based on interview and survey targeting the local residents, we made the activity based sampling (ABS) scenarios fit to the conditions of field. At the same time, we calculated the excess lifetime cancer risk (ELCR) of these ABS scenarios according to the ELCR average value and 95% upper confidence limit (UCL). At the case of weed whacking, soil digging and sweeping yard scenario, 95% UCL of ELCR exceeded the
, acceptable risk range for exposure. Based on our study results, it is necessary safety measures such as risk communication, abatement or management of naturally occurring asbestos (NOA).
Decomposition of Microcystis sp. Cell and Formation of Chlorination Disinfection By-Products
Son, Hee-Jong ; Yeom, Hoon-Sik ; Jung, Jong-Mun ; Choi, Jin-Taek ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 5, 2012, Pages 351~358
DOI : 10.4491/KSEE.2012.34.5.351
Formation of disinfection by-products (DBPs) including trihalomethans (THM), haloacetic acid (HAA) and haloacetonitriles (HAN) from chlorination of extracellular organic matter (EOM) and cells + intracellular organic matter (IOM) of Microcystis sp., a blue-green algae, during decomposed period was investigated. Microcystis sp. cells + IOM and EOM of Microcystis sp. exhibited a high potential for DBP formation. HAAFP (formation potential) was higher than THMFP during decomposed period. In the variations of HAAFP species during decomposed period, the ratio of di-HAAFP species was gradually decreased and the ratio of tri-HAAFP species was gradually increased in the case of EOM during decomposed period, while the opposite result was in the case of cells + IOM during decomposed period. In the variations of HANFP species during decomposed period, the ratio of di-HANFP species was much higher than the ratio of tri-HAAFP species.
An Experimental Study on the Performance of Multi-Diameter Lateral for Riverbed Filtration
Bae, Gha-Ram ; Kim, Seung-Hyun ;
Journal of Korean Society of Environmental Engineers, volume 34, issue 5, 2012, Pages 359~364
DOI : 10.4491/KSEE.2012.34.5.359
In order to prevent the decrease in well efficiencies due to friction in the axial flow in long, large-diameter laterals, a multi-diameter lateral was devised and tested through lab-scale sand-box experiments to assess its performance. In the experiment, three different production rates were applied over the multi-diameter and the three single-diameter laterals to obtain the hydraulic head distributions for each, which was used to assess the performance of the laterals. Results elucidated that the multi-diameter lateral reduced the material cost by more than a third, in comparison to the single-diameter lateral, while maintaining the production rate at higher than 93%, proving its superiority. Furthermore, results indicated that exit velocities exceeding 0.8 m/sec in horizontal wells tended to distort the hydraulic head distribution near the exit, providing evidence of its inefficiency.