open access

https://hdl.handle.net/2115/57283

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

英語

swine urine treatment

2014-10-30

Iwa publishing

Water science and technology

68(7)

1468-1476

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.

学術雑誌論文

Submitted Manuscript Under Review

©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.

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