[논문]도시주거지역 와류형 비점오염 저감시설에서의 Zn제거특성

이승철; 하성룡

도시주거지역 와류형 비점오염 저감시설에서의 Zn제거특성
Removal of Zinc by Vortex Flow Separator as BMPs in Residential Area 원문보기

환경영향평가 = Journal of environmental impact assessment, v.19 no.4, 2010년, pp.443 - 452

초록
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본 연구에서는 도시지역의 하나인 주거지역에서 배출되는 강우유출수 내에 중금속이 장치형 비점 오염저감시설 중에 하나인 와류형시설에서 제거되는 특성을 파악하고자, 대상 중금속을 Zn으로 삼고 2007년 4월부터 2008년 11월까지 모니터링을 수행하였다. 유출수 모니터링은 와류형 시설의 유입부와 유출부에서 유량과 수질을 각각 시간변화에 따라 측정하였으며, 시설유입부와 유출부, 그리고 시설하부에 쌓인 침전물을 채취하여 침전물 모니터링도 수행하였다. 그 결과, 높은 강우강도에서 발생된 강우유출수는 와류형 시설내에 HRT를 감소시켜 Zn의 제거효율이 낮게 관측되었으며, 특히 HRT가 20분이내의 조건이 될 경우에는 처리효과가 없는 것으로 확인되었다. Zn는 입자성물질과 밀접한 관계를 맺으며 제거되는 특성을 보였으며, 입자성물질이 스크린에 의한 여과 및 침전작용이 일어날 때 입자성물질에 부착되어 거동하는 특성을 보였다. 그 중에 0.075mm 이하의 미세한 입자에 부착된 고농도의 Zn는 제거되지 못하였고, 와류형 시설 후단에 후처리시설로서 저류시설을 두어 충분한 HRT를 제공한 결과, 와류형 시설만을 운전하였을 때와 비교하여 높은 제거특성을 보이게 되었다.

주제어

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문제 정의

The primary objective of this study was to identify the removal characteristics of Zn discharged from residential area by the VFS as BMPs. To reveal the removal characteristics of Zn, the research approach involved not only monitoring and sampling inlet and outlet of the VFS but sampling sediment in the bottom of the VFS.
This study has presented removal characteristics of Zn discharged from residential area by the VFS as BMPs. To reveal the removal characteristics of Zn, this research involved not only monitoring storm water in the inlet and outlet of the VFS but sampling sediment on the bottom of the pre-chamber, post-chamber and VFS.

제안 방법

Post processing was conducted to settle the minute particles as giving sufficient HRT to the storm water treated by the VFS. In this study, HRT was given as 24 hours, as well as we observed the concentration of Zn after post processing and calculated removal efficiency in each event. There is no post processing data in the first event only of the whole monitored 12 events.
Sediments with the high concentration of pollutants are easily generated in the VFS because of its own mechanism treating pollutant so that this kind of BMP has to monitor the sediments. In this study, heavy metals including Zn concentration in sediments and particle size were analyzed to reveal the runoff and removal characteristics of particles in the VFS. Sediment samples were collected from three points on October 2007 after the sixth storm event monitoring.
This table shows correlation coefficients above the diagonal and confidence values (P values) below the diagonal. Storm water contaminant parameters of Zn as well as TSS, BOD, COD, DOC, TN and TP and storm factors of rainfall intensity (RainINT), storm duration (RainDT), total rainfall (Rainfall) and Antecedent dry days (ADD) are included. Removal efficiencies of storm water contaminant parameters such as BOD, COD, DOC, TN and TP in the VFS are not correlated with removal efficiency of Zn, with the exception of TSS.
The primary objective of this study was to identify the removal characteristics of Zn discharged from residential area by the VFS as BMPs. To reveal the removal characteristics of Zn, the research approach involved not only monitoring and sampling inlet and outlet of the VFS but sampling sediment in the bottom of the VFS.
This study has presented removal characteristics of Zn discharged from residential area by the VFS as BMPs. To reveal the removal characteristics of Zn, this research involved not only monitoring storm water in the inlet and outlet of the VFS but sampling sediment on the bottom of the pre-chamber, post-chamber and VFS.

대상 데이터

A variety of water quality parameters was measured, including TSS, CODmn, BOD5, DOC, TN, TP and Zn used the Standard Methods. Precipitation and antecedent dry day data were collected from a meteorological observatory which was 500 meters from the study site.
The VFS is situated on the riverside of a branch of the Han River. The catchment is small residential area which is a part of apartment complex and runoff from this catchment in rainy season is discharged into the river via rainwater conduit and the VFS.

데이터처리

We expected that removal characteristics of Zn in storm water are determined by influent condition such as flow rate and velocity. Therefore, correlation analysis was used to reveal the relationship between removal efficiencies of contaminant parameters and storm factors. Moreover, removal characteristics of Zn in the sediment are determined by particle size.

성능/효과

In the case of operating the VFS only, minute particles are passing through the screen without sedimentation in the VFS. In conclusion, it is necessary to operate post processing after VFS process to improve removal efficiency of the VFS for Zn, such as installation of retention tank which offers particles to sufficient HRT for sedimentation.
In this study, Removal efficiencies ranged from -12.8 to 48.1 % in the VFS. Some removal efficiencies of Zn are less than zero in certain storm events.
8 percent As shown in table 2. The removal efficiency of Zn by the VFS with post processing is ranged from 3.5 to 80.4 percent in the monitored 11 events, and this is increased by almost 30 percent. In the case of operating the VFS only, minute particles are passing through the screen without sedimentation in the VFS.
Second, Zn was closely correlated to TSS with positive relationships and when the suspended solids were filtered and settled by the VFS, Zn was settled with attaching to the suspended solids. Third, Minute particles especially less than 0.075mm accounted for upper 45% of the sediments and passed through the VFS with no treatment which were relatively high concentration of Zn in the post-chamber. Finally, When post processing which had 24 hours HRT was conducted, the removal efficiency of Zn was increased compared to operating the VFS only.

참고문헌 (13)

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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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