강제순환에 의한 호수 중의 무기질소변화

이순화 國立 昌原大學校 産業技術硏究所 1992 産技硏論文集 Vol.6 No.-

In generally, water quality of eutrophic zone in lake must decrease nutrients for example phosphorous and nitrogen. This paper is concerned with limnological survey and several field experiment were done for estimating the effect of artificial circulation. Internal nitrogen loading was estimated by the loaboratiory corer method. Sedimentation of nitrogen and suspended solid were determined using sediment traps at bottom. NH₄-N release concentrations of surface on bottom were large more than removed sediment from 5mm to 20mm, However, after cover oxidized sedimentation by artificial circulation decreased NH₄-N release concentration, and nutrients concentrations of interstitical water in sediment were the reverse of the change NH₄-N release concentration by nitrification. TIN release fluxes from sediment lowered from 15.3㎎/㎡/day by 10.7㎎/㎡/day by artificial circulation in Masuma lake.

강둑여과수를 이용한 정수처리 공정별 수질의 변이원성 평가

이순화,박영규,이철희 嶺南大學校 環境問題硏究所 1999 環境硏究 Vol.18 No.2

ABSTRACT Much of the public health concern about this topic originated after the detection of carcinogenic and/or mutagenic compounds in surface water including drinking waters. Such presence of mutagenic substances in river water brings about the possibility of causing hazardous effects on not only aquatic organisms but also human health itself. To secure the safety of drinking water, it should be necessary to monitor these micropollutants. Mutagenicity Test, in this bioassay, should produce at least twice the number of revertants as concurrent negative controls and provide a clear dose-response relationship. In this result, Nakdong River was polluted by the frame-shift mutagenic and hydrophilc compounds. To improve its quality, surface water may be treated in different ways. Several processes, such as bank filtration, coagulation, ozonation and activated carbon adsorption can be used to remove natural and sythetic organic compounds.

인공호수 저니로부터 영양염 용출변화에 관한 연구

이순화,김용환 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.15 No.2

호수내에 있어서 영양염의 변화에 미치는 영향을 고찰하기 위하여 저니에서의 영양염의 용출영향을 보면, 수온에 따른 저니에서의 영양염 용출실험의 결과, 혐기성 상태에서 영양염 용출은 10℃, 20℃, 30℃로 변화 시켰을때, TIN은 2.70, 3.31, 3.78 g/㎡/d로 각각 용출되었고, T-P의 용출량은 0.61, 0.74, 0.76 g/㎡/d였으며, 수온이 높을수록 용출량이 높게 나타나 온도의 의존성이 있다고 판단된다. pH에 따른 저니에서의 영양염 용출실험을 한 결과, 혐기성 상태조건에서 PO_4-P의 용출은 pH가 높을수록 비례적으로 용출량이 많았으나 TIN의 경우는 pH의 의존성이 인의 경우보다 낮게 나타났다. DO에 따른 용출량 변화는, 호기계에서 보다 혐기계인 상태에서 용출이 많이 일어나고 있으며, 호기계에서 용출이 적은 이유는 DO가 저층에 있는 저니에서의 영양염 용출이 일어나는 것을 억제했기 때문이라고 판단된다. This Study focuses on the nutrient release in the artificial lake sediment. Results show that TIN release rates were 2.70, 3.31, 3.78 g /㎡/d, and those of T-P were 0.61, 0.71, 0.76 g/㎡/d at the 10℃, 20℃, 30℃, respectively, indicating the effects of temperature on nutrient release in the sediments. It can also be shown from the experimental result that the release rate PO_4-P increases with increasing pH while that of TIN is not so much affected by the pH, and the nutrient release is more active in anaerobic condition than in aerobic condition Indicating that DO suppresses the nutrient release in the lake sediments.

변이원성을 이용한 낙동강 중류수계의 수질평가

이순화,박영규,이철희 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.17 No.2

强制循環에 의한 湖水의 溶存酸素 變化에 關한 硏究

李淳和,金庸桓 嶺南大學校 環境問題硏究所 1994 環境硏究 Vol.13 No.2

호수의 수질을 개선하기 위한 방법으로 강제순환장치를 도입한 인공호 수질의 변화를 검토하였다. 강제순환장치의 도입 전·후 수온의 변화로 비교하여 강제순환에 의한 수질 변화를 예측한 후, 이화학적인 수질의 변화를 검토하였으며, 호수의 수질 변화에 가장 중요인자인 용존산소의 변화를 표면층에서 저니층까지 검토하여 재폭기에 영향을 주는 강제순환의 효과를 제시하였다. 이때 增間댐과 作名댐의 재폭기 계수는 각각 2.612와 2.984g/㎥/day로 나타났다. Limnological survey and several field experiment were done for estimating the effect of artificial circulation. The changes of vertical distribution of dissolved oxygen concentration resulting from artificial circulation were different from the changes of water temperature. The major factors to control the dissolved oxygen concentration under the artificial circulation were suggested to role of reaeration. The reaeration coefficient, R with the artificial circulation for Masuma and Sakuna Dams were estimated about 2.612 and 2.984g/㎥/day, respectively.

고체상 추출법을 이용한 Phthalate Esters의 분석방법 연구

홍성희,한개희,이찬형,이순화 한국환경과학회 2003 한국환경과학회지 Vol.12 No.1

The study was carried out to evaluate the new analytical method of phthalate esters(diethyphthalate, di-n-butylphthalate, butylbenzylphthalate, bis(2-ethylhexyl)phthalate), one of the endocrine disruptors, which were performed by GC/MS-SIM(seleted ion monitoring). The phthalate esters were extracted from water samples using solid-phase extraction on C_18 columns. It investigated that the extraction recovert rate of phthalate esters with different solvents and solvent volume. The optimal solvent was dichloromethane and proper volume of dichloromethane for recovert of phthalate esters was 4 mL. There were good linearities(above R^2=0.9975) in the range 0.01∼0.50㎎/L,and the detection limits were below 0.01∼0.03㎍/L.The recovert rates,RSD and MDLs for phthalate esters were 80∼114%,5.0∼8.1% and 0.03∼0.11㎍/L,respectively. This method shows a good precision of phthalate esters.

Proposal of enhanced treatment process based on actual pilot plant for removal of micropharmaceuticals in sewage treatment plants

Shun-hwa Lee,Yun-kyung Park,Miran Lee,Byung-dae Lee 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.4

This study was carried out to increase the treatment efficiency through the improvement of the conventional biological process, and to propose the optimal treatment direction. The optimal treatment conditions were derived based on the results of the spike damage tests in each single process. The removal efficiency of micropharmaceuticals was further increased when an ozone treatment process was added to the biological process compared to the single process. The soil and activated carbon adsorption process was introduced in the post-treatment to remove the micropharmaceutical residues, and the removal efficiency of the pharmaceduticals in the final effluent was more than 85% in spike damage experiment. In particular, the continuous process of biological treatment-ozone-adsorption could ensure the stable treatment of micropharmaceuticals, which had not been efficiently removed in the single process, as it showed more than 80% removal efficiency. Therefore, it is expected that the addition of the ozone oxidation and activated carbon adsorption process to the existing sewage treatment facilities can contribute to the efficient removal of micropharmaceuticals.

WATER QUALITY EVALUATION OF NAKDONG RIVER BY MUTAGENICITY

Shun Hwa Lee,Yung Kyu Park,Chul Hee Lee,Ji Hoon Kim 대한환경공학회 1999 Environmental Engineering Research Vol.4 No.3

Evaluation of the tributaries by influence index on the mid-lower portion of the Nakdong River basin

Shun-Hwa Lee,Seung-Gyu Jung,Seoung-Muk Park,Byung-Dae Lee 대한환경공학회 2018 Environmental Engineering Research Vol.23 No.2

The deteriorating role of Nakdong River due to the Four Major Rivers Project has caused a series of problems, including water pollution, drying streams, aggravation of the hydroecology. Geumho River and Gyeongseong-cheon had a higher concentration index and is believed to impact the water quality of the main stream. The influence index of Geumho River and Nam River between 2015 and 2016, which have a large amount of discharge, was the highest among the tributaries in terms of the load material balance. Showing the highest average concentration and average load in the index assessment, Geumho River is believed to require an intensive management for improving the water quality of the main stream. Furthermore, when the cumulative percentage of the average concentration and average load was compared based on the water quality improvement of the tributaries mixed to Nakdong River, which was set to 60%, Geumho River, Nam River, Topyeong-cheon, and Cha-cheon, which showed the highest ratio in that order, were determined to require a water quality management program as a priority.

Dependency of Mutagenicity on Micropollutants - A Case Study on Nakdong River Water -

( Shun Hwa Lee,Yung Kyu Park,Chul Hee Lee,Ji Hoon Kim,Su Hyon Kim ) 한국물환경학회 1997 제6차 국제수질보전학회 아시아 태평양지역 학술회의 Vol.2 No.-