하수고도처리용 미세조류의 최적회수를 위한 전기응집기술 적용에 있어 전류의 영향

서지정보

ㆍ발행기관 : 대한상하수도학회 ㆍ수록지정보 : 상하수도학회지 / 28권 / 4호
ㆍ저자명 : 이석민, 주성진, 최경진, 장산, 황선진

영어 초록

Microalgae is known as one alternative energy source of the fossil fuel with the small size of 5 50 m and negative charge. Currently, the cost of microalgae recovery process take a large part, about 20 - 30% of total operating cost. Thus, the microalgae recovery method with low cost is needed. In this study, the optimum current for Scenedesmus dimorphus recovery process using electrocoagulation techniques was investigated. Under the electrical current, Al metal in anode electrode is oxidized to oxidation state of Al3+. In the cathode electrode, the water electrolysis generated OH- which combine with Al3+ to produce Al(OH)3. This hydroxide acts as a coagulant to harvest microalgae.Before applying in 1.5 L capacity electrocoagulation reactor, Scenedesmus dimorphus was cultured in 20 L cylindrical reactor to concentration of 1 OD.The microalgae recovery efficiency of electrocoagulation reactor was evaluated under different current conditions from 0.1 0.3 A. The results show that, the fastest and highest recovery efficiency were achieved at the current or 0.3 A, which the highest energy efficiency was achieved at 0.15 A.

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