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Environmental Engineering Research 2003;8(3): 152-161. DOI: https://doi.org/10.4491/eer.2003.8.3.152
SEPARATION OF ALGAL PARTICLES FROM WASTE STABILIZATION PONDS BY FLOATING AQUATIC PLANT: DESIGN APPROACH
Youngchul Kim1, and Dimosthenis L. Giokas2
1Department of Environmental Engineering Hanseo University, Seosan, Chungnam 356-706, Korea
2Department of Chemistry, University of Ioannina, Ioannina 45110, GREECE
Corresponding Author: Youngchul Kim ,Tel: +82-41-660-1432, Fax: +82-41-660-1119, Email: ykim@hanseo.ac.kr
Received: March 12, 2003;  Accepted: July 11, 2003.
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ABSTRACT
We demonstrated that water hyacinth ponds (WHPs) can polish the effluent from waste stabilization ponds(WSPs) by separating SS, insoluble COD and nutrients efficiently. High pH of the WSPs effluent was easily adjusted to 6 — 7 as it passed through the WHPs. However, the use of water hyacinth rapidly reduced dissolved oxygen at the first cell to less than 3 mg/L or very frequently to a level of anaerobic state. Associated with the passage of the WSPs effluent through the WHPs, possibility of the regrowth was investigated. It was found that water hyacinth ponds did not interfere with the inactivation level of WSPs when they were used for polishing purpose. Reduction of suspended solids at the WHPs mainly depends on the detention time and pH. An empirical separation model incorporating the detention time and pH dependence was developed. Design calculation shows that about 58.4 ha of the surface area per 106 m of the effluent from WSPs during the summer is required to obtain 90% separation efficiency of SS. In addition, this model can be incorporated into the organic and nutrients reduction models of WHPs, thus can help design the required length of water hyacinth channels for upgrading the WSPs effluent to the goal of treatment.
Keywords: algal particles | water hyacinth ponds | waste stabilization ponds
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