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NPS-WET 모형을 이용한 인공습지의 수질정화효과 분석
이한필 ( Han-pil Rhee ),윤춘경 ( Chungyeong Yoon ),정광욱 ( Kwang-wook Jung ),손영권 ( Yeongkwon Son ),정지연 ( Jiyeon Jung ) 한국농공학회 2011 한국농공학회 학술대회초록집 Vol.2011 No.-
Construction of combination system of catch canals and wetlands were planned for water-quality improvement of discharges from agricultural area in lower Dong-jin river basin. In this study, variation of water-quality by designated combination systems was analyzed using NPS-WET model. And NPS-WET model was also performed to assessment for propriety of design factor and operating plan. Result of simulation was showed that pollutants in discharges is removed significantly. BOD of 30.7 ~ 39.0%, T-N of 46 ~ 60%, T-P of 40.7 ~ 57.0% and SS of 68.2 ~ 74.7% were reduced through wetlands. Nutrients reduction of wetlands was more conspicuous in summer, because vital activity of microorganism, macrophyte and algae was augmented with rising of air and water temperature. Effluents from wetlands can affect water-quality of catch canal drains, especially water-quality on junction point to Dong-jin river. This result was showed significantly on low-flowed catch canal (Un-san). On the other hand, water-quality of high-flowed catch canal (Won-pyeong) was not that definite. Wetland of appropriate size is necessity for treatment of large amount of water. NPS-WET is useful tool for assessment of water-quality improvement effect through designated wetland with various operating plan.
이한필 ( Han-pil Rhee ),윤춘경 ( Chun-gyeong Yoon ),손영권 ( Yeongkwon Son ),이승재 ( Seung-jae Lee ),최재호 ( Jae-ho Choi ) 한국농공학회 2012 한국농공학회 학술대회초록집 Vol.2012 No.-
본 연구의 목적은 수생태위해성예측 및 장기생태영향평가를 위한 AQUATOX 모형의 국내 적용성을 평가하고, 향후 그 활용을 위한 방법론을 제시하는데 있다. 연구대상지역은 팔당호로서, 유역모형과 연계된 AQUATOX 모형을 구축하기 위해 남한강상류 유역과 북한강상류 유역으로부터 팔당호에 이르기까지 BASINS/WinHSPF 유역모형을 적용하여 유역 수문·수질을 모의하였다. 이를 바탕으로 유역모형의 모의결과와 GIS자료가 연계된 AQUATOX 모형을 구축하였으며, 문헌연구를 통해 요구되는 식물플랑크톤과 동물플랑크톤, 어류 등에 대한 다양한 생태조사 자료를 수집한 후, 합리적으로 분석하여 모형 내 이용 가능한 생물량 자료로 환산·적용하였다. AQUATOX 모형을 이용해 2008년부터 2010년까지 팔당호의 생태변화를 모의하고, 계절적인 특성과 섭식 영양단계(Trophic levels)에 따른 생물량 변화를 분석하였다. 모의 결과, 식물플랑크톤과 동물플랑크톤의 경우 봄, 가을철 생물량이 뚜렷하게 증가하였으며, 식물플랑크톤은 규조류와 녹조류, 남조류, 편모조류에 따라 최대생장시기가 다르게 나타났다. 요각류와 지각류, 윤충류 등 동물플랑크톤은 이른 봄철 생물량이 증가하기 시작하여 가을철까지 이어졌고, 특히 여름 이전에 높은 생물량을 보였다. 어류의 경우 연중 생물량변화에 있어서 종에 따라 다소 차이를 보였으며, 이는 고등생물로 갈수록 섭식관계에 있어서 선호하는 포식종의 생장에 더욱 복잡한 영향을 받기 때문인 것으로 판단된다. 한편 농촌지역에서 제초제로서 흔히 사용되어진 Alachlor와 Paraquat, 그리고 가축사료 첨가제로서 이용되고 있는 황산구리 (Copper sulfate)에 대한 가상의 유입 시나리오를 설정하여 생태영향을 모의하였다. 이 때 대상물질의 유입농도는 수생태독성에 대한 모델의 반응을 검토하기 위해 고농도로 설정하였으며, 이를 통해 생물량과 생물축적량 변화에 대한 예측결과를 비교하였다. 어독성 2급 물질인 Alachlor가 수계 유입될 경우, 10 μg/L 이상의 농도에서 개체 크기가 작은 피라미 종부터 영향을 받았으며, 100 μg/L 이상에서는 피라미와 베스의 생물량이 크게 감소하였고, 1000 μg/L (1ppm)이상에서는 대부분 어류의 생존이 불가능한 것으로 나타났다. Paraquat의 경우, Alachlor와 유사한 결과를 보였으나, 피라미와 베스에 있어서는 10 μg/L 수준에서도 생물량이 눈에 띄게 감소하는 등 그 영향이 더욱 크게 나타났다. 황산구리 (Copper sulfate)의 경우에는 거의 모든 생물군에 있어서 저농도로부터 유입 수준으로부터 확연한 생물량 감소를 나타내었다.
기술노트 : NPS-WET 모형을 이용한 인공습지의 수질정화효과 분석
이한필 ( Han Pil Rhee ),정광욱 ( Kwang Wook Jung ),이복수 ( Bok Soo Lee ),함종화 ( Jong Hwa Ham ),손영권 ( Yeong Kwon Son ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.2
A combination system of catch canal and constructed wetland was designed and suggested to improve water quality in gagricultural region of lower Dong-jin river basin. In order to evaluate an water quality improvement efficiency of the designed combination system, the NPS-WET model was applied in this study. Simulation result of the NPS-WET shown that the nutrient load removal rate of constructed wetland was BOD, T-N, T-P and SS was 30.7~39.0%, 46~60%, 40.7~57.0% and 68.2~74.7%, respectively. Nutrients reduction of constructed wetland was higher in growing season than winter season because vital activity of microorganism, macrophyte and algae was augmented with high air and water temperature. Effluents from constructed wetland can affect water-quality of catch canal drains, especially, water-quality on junction point to Dong-jin river. Water-quality improvement in low-flowed catch canal (Un-san) was more significant than in high-flowed catch canal (Won-pyeong). In conclusion, a feasible design of constructed wetland is necessary to treat large quantity of receiving water. The NPS-WET is useful tool for assessing water-quality improvement efficiency using constructed wetland.
손영권,이한필,김해도,최선화,김정대,Son, Yeong Kwon,Rhee, Han-Pil,Kim, Haedo,Choi, Sun Wha,Kim, Jeong Dae 한국농공학회 2015 한국농공학회논문집 Vol.57 No.4
Safety of reclaimed wastewater irrigation needs to be evaluated to promote public health. Quantitative microbial and toxic risk assessment was conducted to identify the level of risk for farmland workers who use reclaimed wastewater and groundwater in Jeju island. Microbial risk through inhalation and ingestion exposure was below acceptable level (less than $10^{-3}$) of $7.07{\times}10^{-6}$ for reclaimed wastewater and $9.99{\times}10^{-8}$ for groundwater irrigation worker. Aggregate exposure risk of Ni, As and Cu was most contributable to overall risk in both reclaimed wastewater and groundwater irrigation plot. High cumulative exposure risk was estimated through non-dietary soil ingestion and dermal contact of soil, due to the high concentration of As, Cu and Ni in farmland soil. Overall toxic risk was $2.68{\times}10^{-4}$ for reclaimed water and $2.39{\times}10^{-4}$ for groundwater irrigation, which could not meet acceptable toxic risk level of $10^{-6}$. Further efforts, such as provide personal protective equipments or public health education, need to be implicated to reduce adverse health risk.
유역-호소 통합수질예측 기법을 이용한 물왕저수지 수질개선효과 분석
오희상,이한필,Oh, Heesang,Rhee, Han-Pil 한국농공학회 2017 한국농공학회논문집 Vol.59 No.3
Since living environment has improved, waterfront space using and clear water demand have increased. Ministry of Environment (ME) designated polluted reservoir (worse than 4th grade) as a priority management reservoir to improve water quality (better than 3rd grade) accordingly. Minstry of Agriculture, Food and Rural Affairs (MAFRA) aims reservoir water quality 4th not 3rd grade. And water quality of agricultural reservoirs was not a great interest. For this reason, there are very few water quality monitoring data. However after designating as a priority management reservoir, reservoir manager should start water quality and flow monitoring of reservoirs and inflow streams. This process makes it possible setting complex model to accurate prediction of reservoir water quality and volume. Mulwang reservoir designated as a priority management reservoir in September 2014. In this study, BASINS/WinHSPF and EFDC-WASP were used to predict effect of water quality improvement countermeasures in Mulwang reservoir. To improve water quality of Mulwang reservoir, Siheung-si and Korea Rural Community Corporation (KRCC) established water quality improvement countermeasures. However result of simulation adapting these countermeasures cannot achieve 3rd grade. So 4 additional scenarios were adapted and the result satisfied 3rd grade. This study could help to establish water quality improvement countermeasure by using complex modeling.