Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Recycling Water Treatment of Aquaculture by Using DynaSand Filter II. Effect of Coating on Removal of Bacteria and Virus in Sand Columns

상향류식 연속 역세 여과를 이용한 양어장 순환수 재리용 II. 여과사의 표면처리에 의한 세균 및 바이러스 처리율 검토

  • Published : 2003.05.01
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Abstract

To improve the efficiency of removal of bacteria and virus with DynaSand Filters used for treatment of recycling wastewater from aquaculture, effect of biofilm formation on bacterial transport through coated sand was estimated. At the neutral pH (pH 7.0), the coated sand was positive of zeta potential (surface charge). Column experiments were also carried out to test the effect of uncoated sand as well as coated sand with Al and Fe. The coated sand influenced more significantly the surface properties, adsorption and transport than the uncoated sand. The leaching batch system investigated for synthetic water showed concentrations of 7.47, 4.80, 20.89 and 7.23 mg/L for the uncoated sand, coated sand with Al, Fe and Al+Fe, respectively. Hence there are significant differences among the tested coatings with reference to bacterial transport and surface properties.

본 연구에서는 상향류식 연속 역세여과 연구를 통하여 양어장 순환수 처리 후 박테리아 및 바이러스 등을 효과적으로 처리하는 기술 개발과 여과사에 금속염을 코팅시켜 생물막의 형성을 도모하는 연구를 수행하였다. 여과사를 코팅한 경우 중성 pH에서 zeta potential 양(+)이 됨을 알 수 있었고 zeta potential이 양(+)에 근접할수록 column test에서 바이러스 제거효율이 증가함을 알 수 있었다. 따라서 여과사를 금속염으로 코팅을 하는 경우가 안한 경우 보다 음이온을 띤 부유물 제거에 탁월한 효능이 있음을 보여주었다. pH에 따른 여과재료의 흡착율에서 Al coating과 Al+Fe coating은 반응 시간 30분까지 효과적으로 흡착이 일어나는 것을 볼수 있었고 이 후의 반응시간에서 파과 곡선형태를 보여주었다. 회분식 형태로 운영한 여과재료를 이용한 탈착실험에서 Non, Al, Fe및 Al+Fe coating모두에서 pH 9.95에서 용출(leaching)되는 농도가 가장 높았으며 각각의 농도는 7.47, 4.80, 20.89 및 7.23 mg/L로 각각 나타났다. 이번 연구에서 Al coating의 경우 pH에 따른 영향은 거의 나타나지 않았으며, pH가 증가함에 따라 약간 감소하는 것을 알수 있었고 Fe coating에서는 pH의 영항이 없었으며, Al+Fe coating에서는 pH가 증가함에 따라 탁도도 역시 일정하게 증가하는 것으로 나타났다.

Keywords

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