Advanced Sewage Treatment with Ozone Under Excess Sludge Reduction, Disinfection and Removal of EDCs

Authors: Tsuno, Hiroshi¹; Arakawa, Kiyomi²; Kato, Yasuhiro³; Nagare, Hideaki⁴

Source: Ozone: Science and Engineering, Volume 30, Number 3, May 2008 , pp. 238-245(8)

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Abstract:

A new advanced treatment system, which consists of biological nutrient removal process combined with reduction of excess sludge by ozonation and phosphorus recovery by crystallization and polishing-up ozonation process, was developed based on the fundamental studies and demonstrated by the demonstration plant set in AICHI EXPO 2005. Reduction of withdrawn excess sludge by 90% and phosphorus recovery by 70% were accomplished without any adverse effects on biological nutrient removal. The concentrations of SS, BOD, T-P and T-N in the effluent were less than 1.0, 3.0, 0.5 and 10 mg/L, respectively. EDCs were reduced to almost undetectable level and 2-log disinfection of Bacillus subtilis was established. The energy amount required for the operation was saved by 40% when compared with a conventional system to get the same level of water quality.

Keywords: Ozone; Advanced Sewage Treatment; Excess Sludge; Disinfection; Endocrine Disrupting Chemicals

Document Type: Research article

DOI: http://dx.doi.org/10.1080/01919510802070710

Affiliations: 1: Graduate School of Engineering, Kyoto University, Kyoto, Japan 2: Intellectual Property Department, EBARA CORPORATION, Tokyo, Japan 3: Development Department, Fuji Electric Water Environmental Systems Co., Ltd., Ichihara, Japan 4: Faculty of Engineering, Kitami Institute of Technology, Kitami, Japan

Publication date: 2008-05-01