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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
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 www.iwapublishing.com. |
Type: | article (author version) |
URI: | http://hdl.handle.net/2115/57283 |
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)
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Submitter: 井上 京
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