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Design and performance of hybrid constructed wetland systems for high-content wastewater treatment in the cold climate of Hokkaido, northern Japan

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Title: Design and performance of hybrid constructed wetland systems for high-content wastewater treatment in the cold climate of Hokkaido, northern Japan
Authors: Kato, K. Browse this author
Inoue, T. Browse this author
Ietsugu, H. Browse this author
Sasaki, H. Browse this author
Harada, J. Browse this author
Kitagawa, K. Browse this author
Sharma, P. K. Browse this author
Keywords: cold climate
dairy wastewater
hybrid wetland system
oxygen transfer rate
potato starch processing wastewater
swine urine treatment
Issue Date: 30-Oct-2014
Publisher: Iwa publishing
Journal Title: Water science and technology
Volume: 68
Issue: 7
Start Page: 1468
End Page: 1476
Publisher DOI: 10.2166/wst.2013.364
Abstract: The performance of six multistage hybrid constructed wetland systems was evaluated. The systems were designed to treat four kinds of high-content wastewater: dairy wastewater (three systems, average inflow content 2,400-5,000 mg.COD l(-1), 3-6 years of operation); pig farm wastewater, including liquid food washing wastewater (one system, 9,500 mg.COD l(-1), 3 years); potato starch processing wastewater (one system, 20,000-60,000 mg.COD l(-1), 3 years); and wastewater containing pig farm swine urine (one system, 6,600 mg.COD l(-1), 2.8 years) (COD chemical oxygen demand). The systems contained three or four vertical (V) flow beds with self-priming siphons and surface partitions and no or one horizontal (H) flow bed (three to five beds). In some V flow beds, treated effluents were recirculated (Vr) through the inlet to improve performance. Mean annual temperature was 5-8 degrees C at all locations. To overcome clogging due to the high load in a cold climate, we applied a safety bypass structure and floating cover material to the V flow beds. Calculated average oxygen transfer rates (OTRs) increased proportionally with the influent load, and the OTR value was Vr > V > H. The relations of load-OTR, COD-ammonium, and a Arrhenius temperature-dependent equation enable the basic design of a reed bed system.
Rights: ©IWA Publishing 2013. The definitive peer-reviewed and edited version of this article is published in Water science and technology 68 (7)p. 1468-1476 2013 10.2166/wst.2013.364 and is available at
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 井上 京

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