Cho, Kang Woo Chung, Chong Min Kim, Yun Jung Chung, Tai Hak 2024-01-20T19:30:23Z 2024-01-20T19:30:23Z 2022-01-10 2010-05 0960-8524 https://pubs.kist.re.kr/handle/201004/131458 Electroflotation (EF) was investigated as a final clarification of an activated Sludge process, to intensify its novel clarification and thickening efficiency. During operation of a biological reactor combined with an EF clarifier. deterioration of clarification efficiency was observed. Scale deposition on electrodes caused a coarse electrode Surface, significantly increasing the size of the electrolytic bubbles. The average bubble size was initially 34 mu m and increased to 80 mu m after bulk cell electrolysis for 150 h. X-ray diffractometry and scanning electron microscopy further characterized the scale deposition as a Cluster of calcite (CaCO3) and brucite (Mg(OH)(2)). Switching the polarity of electrical current clearly alleviated the increase of bubble size, when applied before scale growth. Under the control of scale deposition, excellent clarification was observed, with the effluent turbidity consistently lower than 2 NTU. An efficient thickening, with the concentration of return activated sludge higher than 15 g L-1, was additional advantage of the EF clarifier. (C) 2009 Elsevier Ltd. All rights reserved. English ELSEVIER SCI LTD MUNICIPAL WASTE-WATER CALCAREOUS DEPOSITS ELECTROCHEMICAL METHODS DEEP TANKS FLOTATION ELECTROFLOTATION REMOVAL NITROGEN MODEL Continuous clarification and thickening of activated sludge by electrolytic bubbles under control of scale deposition Article 10.1016/j.biortech.2009.11.075 1 BIORESOURCE TECHNOLOGY, v.101, no.9, pp.2945 - 2951 BIORESOURCE TECHNOLOGY 101 9 2945 2951 scie scopus 000274972600006 2-s2.0-74649083134 Agricultural Engineering Biotechnology & Applied Microbiology Energy & Fuels Agriculture Biotechnology & Applied Microbiology Energy & Fuels Article MUNICIPAL WASTE-WATER CALCAREOUS DEPOSITS ELECTROCHEMICAL METHODS DEEP TANKS FLOTATION ELECTROFLOTATION REMOVAL NITROGEN MODEL Activated sludge process Clarification Electroflotation Scale deposition Thickening