Continuous clarification and thickening of activated sludge by electrolytic bubbles under control of scale deposition
SCIE
SCOPUS
- Title
- Continuous clarification and thickening of activated sludge by electrolytic bubbles under control of scale deposition
- Authors
- CHO, KANGWOO; Chong Min Chung; Yun Jung Kim; Tai Hak Chung
- Date Issued
- 2010-05
- Publisher
- ELSEVIER SCI LTD
- Abstract
- 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 (CaCO(3)) 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.
- Keywords
- DISSOLVED AIR FLOTATION; MUNICIPAL WASTE-WATER; CALCAREOUS DEPOSITS; SECONDARY CLARIFICATION; ELECTROCHEMICAL METHODS; DEEP TANKS; ELECTROFLOTATION; REMOVAL; ELECTROCOAGULATION; PHOSPHORUS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/40869
- DOI
- 10.1016/j.biortech.2009.11.075
- ISSN
- 0960-8524
- Article Type
- Article
- Citation
- BIORESOURCE TECHNOLOGY, vol. 101, no. 9, page. 2945 - 2951, 2010-05
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