• Journal of Korean Society of Environmental Engineers
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• v.35 no.1
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• pp.45-56
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• 2013

This study was suggested as fundamental data to control medical materials remained in Nakdong range gauge. The level of Iopromide detected in Nakdong mainstream was $0.0015{\sim}0.37{\mu}g/L$, Mefenamic acid $0.0087{\sim}0.056{\mu}g/L$, Diclofenac $N.D.{\sim}0.01{\mu}g/L$, Atenolol $N.D.{\sim}0.024{\mu}g/L$, Propranolol $N.D.{\sim}0.0038{\mu}g/L$, Lincomycin $0.0005{\sim}0.038{\mu}g/L$, and Trimethoprim $N.D.{\sim}0.0083{\mu}g/L$. At sewage disposal plant in the region, most of them were detected high levels of density. Especially, the level of Iopromide was found the highest up to $5.38{\mu}g/L$. At livestock wasted water disposal plant, the level of lincomycin was detected the highest figure of $477{\mu}g/L$. As a result, medical materials from Nakdong River mainstream got increasing the concentration due to inflow from sewage disposal plant in Gumi and River Geumho in Daegu, which affects residential and industrial areas significantly. Therefore, to control medical materials remained in Nakdong River efficiently, Geumho River and sewage disposal plants shall be continuously monitored and managed, which is recommendable.

• Journal of the Korean Applied Science and Technology
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• v.24 no.4
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• pp.332-338
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• 2007

Based on the experiment results of laboratory scale modified anoxic-oxic process for leachate treatment, biological nitrogen removal program was verified in terms of SS, COD, and TN concentration. These measured water qualities concentration could be predicted by biological nitrogen removal program with $R^2$ of 0.994, 0.987, 0.990, respectively. No error was occurred between water qualities concentration and quite wide range of water qualities concentration (i.e., 50-4200 mg/L) during the modelling. Each unit and final effluent of simulated concentration was kept good relationship with that of measured concentration therefore this biological nitrogen removal program for sewage or wastewater treatment plants has good reliance.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.123-123
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• 2016

만곡부, 합류부 등의 복잡한 지형을 갖는 자연하천에서의 오염물의 혼합 거동에 대한 이해는 수자원의 관리에 있어서 매우 중요하다. 특히 하폐수처리장과 같은 처리시설의 방류수와 같이 연속적으로 유입되는 오염물의 경우 하천 생태계에 지속적인 영향을 끼치며, 이러한 방류수는 대부분 지류를 통해 본류로 유입되게 된다. 이러한 오염물질이 지류로부터 본류로 합류되는 초기구간(near-field)의 경우, 횡방향 및 연직방향의 혼합 거동에 대한 상세한 분석이 필요하다. 본 연구에서는 금호강과 진천천이 좌안으로부터 합류되는 낙동강 중류 구간에서의 초기 혼합 구간의 연구를 위하여 전기전도도(electrical conductivity: EC)를 이용한 농도 추적 실험을 수행하였다. 수온, 전기전도도, 이온화 물질 등과 같은 자연 추적자(natural tracers)를 이용하는 농도 추적 실험은 인공추적자 물질을 이용한 실험을 대체할 수 있는 방안으로서, 기존 추적자 실험과 비교하여 경제적, 환경적인 효과와 하폭이 넓은 중규모 이상의 하천에서도 수행할 수 있다는 장점을 가지고 있다. 실험 구간에서 합류되는 2개의 지류 모두 인근 하폐수처리장으로부터 방류수가 연속적으로 유입된다. 본류에서 정해진 측선을 따라 센서가 설치된 보트를 이용하여 실시간으로 농도, 수리량 데이터를 GPS 위치 데이터와 함께 취득하였다. 실험 수행 결과, 지류인 금호강과 진천천의 EC 농도가 합류 전 낙동강 본류의 EC 기저농도보다 더 높은 값을 나타내었다. 이후 지류가 합류된 직후의 측선에서 측정한 EC 농도분포를 분석한 결과, 연직방향의 편차가 크게 나타나는 것으로 나타났으며 특히 유량이 낮을수록 연직 방향 편차가 커지는 경향을 보였다. 전반적으로 수심이 깊은 구간의 저층부로 갈수록 전기전도도의 값이 증가하는 경향을 나타났으며 흐름방향으로 진행됨에 따라 연직 편차가 줄어드는 경향을 보였다. 횡방향 혼합의 경우 지류의 유입으로 인하여 본류 좌안 쪽에서 전기전도도의 값의 상승을 확인할 수 있었으며 하류로 이동할수록 불균등했던 전기전도도의 분포가 횡방향 혼합을 통하여 균등한 분포로 전환되는 것으로 나타났다.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.579-579
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• 2015

최근의 환경부의 환경관리정책은 기존의 BOD나 COD로 대표되는 이화학적인 분석으로 수질항목을 측정 분석하여 환경규제로 활용되고 있는 상황에서 환경용량 기반의 수용체 중심의 통합관리방안을 추가하여 규제하는 방법으로 이루어지고 있다. 또한 수질관리부분에서도 2006년 "물환경관리 기본계획('06-'09)"을 수립하여, 생태적으로 건강하고 유해물질로부터 안전한 물환경조성 목표하에 오염원 중심에서 수용체 중심 즉, 통합적인 수질관리 방향으로 추진되고 있다. 하지만 하 폐수에 함유된 모든 유해화학물질에 대하여 배출허용기준을 설정하는 것이 현실적으로 불가능하기 때문에 환경부에서는 "생태독성 통합관리제도(WET : Whole Effluent Toxicity)"를 도입, 2007년 상기법의 시행규칙 개정을 통하여 배출허용기준에 생태독성기준을 추가하여 관리하고 있다. 생태독성을 평가하는 생물군에는 박테리아, 조류, 물벼룩, 어류 등 다양한 생물종이 있으며 국내에는 물벼룩을 이용하여 TU라는 생태독성단위를 이용하여 규제 및 관리를 시행하고 있으나 단일 생물종으로만 관리할 경우 생물의 내성 및 특정 유해물질에만 반응하는 특성을 지니고 있어 여러 가지 복합적인 화합물에 적용하기 위해서는 복수종에 대한 관리 및 규제가 필요한 실정이다. 따라서 본 연구에서는 반달말(조류)를 이용한 WEMS(Water Enviroment Monitoring System)를 이용하여 하천 호소 및 정수장, 하 폐수처리장등 다양한 현장에 적용하여 화학물질군에 대한 독성의 특성을 파악과 더불어 통계학적 처리를 이용하여 수질관리에 대한 방법을 제시하고 과학적이고 현장 특성에 맞는 경보 수준을 통해 수생태관리에 관리에 기여 할 수 있을 것으로 기대된다.

• 한국생물공학회:학술대회논문집
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• 2002.04a
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• pp.355-358
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• 2002

In this study, we have tried to find the maximum microbial efficiency at the various dissolved oxygen (DO) concentration conditions in the treatment of pharmaceutical wastewater. Experiments of activated sludge process were performed to examine the relation between microbial activity and DO concentration in a continuous bioreactor. The reduction rate of COD (chemical oxygen demand) was low at the DO concentration between 0 ppm and 1.0 ppm, but it went higher and showed maximum between 1.5 ppm and 3.0 ppm. Then the COD reduction rate was quickly decreased above the DO concentration of 3.0 ppm.

• Journal of the Korean Institute of Intelligent Systems
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• v.15 no.4
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• pp.431-436
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• 2005

This paper describes how to diagnose SBR plant equipment using time-series data mining. It shows the equipment diagnostics based upon vibration signals that are acquired front each device lot process control. Data transform techniques including two data preprocessing skills and data mining methods were employed in the data analysis. The proposed method is not only suitable for SBR equipment, but is also suitable for other Industrial devices. The experimental results performed on a lab-scale SBR plant show a good equip-ment-management performance.

• Journal of Korean Society of Environmental Engineers
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• v.34 no.5
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• pp.326-334
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• 2012

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.

• Journal of Wetlands Research
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• v.22 no.4
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• pp.321-327
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• 2020

Recently The amount of wastewater and linked wastewater is being increased every year due to industrial development, population growth, and improvement in living standards. Linked wastewater shows the feature-low flow rate and high concentration. Therefore, it has been shown that it has a great impact on the operation of the sewage treatment plant and costs a lot for treating linked wastewater. In this study, a scenario with low increase of water quality when the total amount of the inflow of linked wastewater was entered into individual reactors is obtained. According to the result of modeling, The effluent water quality get the least increment once the water was introduced into the influent and anoxic tank. We generated the various scenarios Based on these results. scenarios are varying according to inflow from linked waste water's distribution ration. As a result of modeling through various scenarios, it was found that the increment of TN and TP were at the least when the inflow of linked water was distributed with ratio between sewage (80%) and oxygen-free tank (20%).

• Journal of Korean Society of Environmental Engineers
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• v.33 no.11
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• pp.821-826
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• 2011

Synthetic musk compounds are widely used as fragrances in a variety of personal care products like soaps, sampoos, cosmetics and perfumes. The occurrence of synthetic musk compounds in municipal sewage effluent and other environmental samples could negatively impact the health of the ecosystem and humans, due to persistent and long-term chronic exposure of aquatic organisms. Fifteen synthetic musk compounds (musk ketone, musk xylene, musk ambrette, musk moskene, musk tibetene, HHCB, AHTN, ADBI, AHDI, DPMI, ATII, ethylenebrasssylate, ambretettolide, cyclopentadecanolide, OTNE) were analysed in surface waters and sewage treatment plants (STP) influents/effluents in Korea by GC/MS. Method detection limits were $0.005{\sim}0.398{\mu}g/L$. HHCB and AHTN were most frequently observed in both surface waters and STP influents/effluents.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.13 no.3
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• pp.245-253
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• 2001

Mixing zone characteristics of the wastewater effluents discharged from Sokcho ocean outfall have been investigated using an outfall mixing zone model which was developed on the basis of Huang et al.'s(1996) analysis method. The model was applied to Sokcho ocean outfall case and was used to simulate the concentration distribution of wastewater effluents using winter season's data, ie. daily effluent flowrate, ocean current and density stratification data which were measure for two months in the outfall area. Hourly concentration distribution of outfall effluent discharges was calculated and they were averaged for the period of 15 days which covers the ambient flow variability of the neap and the spring tidal currents. The results show that near-field dilution was relatively high with the minimum dilution of 130 for the winter season. The mixing zone was extended to the coastal beach area rather than offshore because of major direction of coastal currents. This may cause a deteriorating impact on coastal water quality, especially to the adjacent swimming beach area.