期刊
ENVIRONMENTAL TECHNOLOGY
卷 38, 期 2, 页码 183-191出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2016.1187206
关键词
Livestock wastewater; milking parlor; purification efficiency; reed bed; treatment wetland
资金
- JSPS KAKENHI [26292185]
- Ministry of Agriculture, Forestry and Fisheries, Japan
- Grants-in-Aid for Scientific Research [26292185] Funding Source: KAKEN
This study followed three field-scale hybrid subsurface flow constructed wetland (CW) systems constructed in Hokkaido, northern Japan: piggery O (2009), dairy G (2011), and dairy S (2006). Treatment performance was monitored from the outset of operation for each CW. The ranges of overall purification efficiency for these systems were 70-86%, 40-85%, 71-90%, 91-96%, 94-98%, 84-97%, and 70-97% for total N (TN), NH4-N, total P, chemical oxygen demand (COD), biochemical oxygen demand, suspended solid, and total Coliform, respectively. The hybrid system's removal rates were highest when influent loads were high. COD removal rates were 46.4 +/- 49.2, 94.1 +/- 36.6, and 25.1 +/- 15.5 g COD m(-2) d(-1) in piggery O, dairy G, and dairy S, with average influent loads of 50.5 +/- 51.5, 98.9 +/- 37.1, and 26.9 +/- 16.0 g COD m(-2) d(-1), respectively. The systems had overall COD removal efficiencies of around 90%. TN removal efficiencies were 62 +/- 19%, 82 +/- 9%, and 82 +/- 15% in piggery O, dairy G, and dairy S, respectively. NH4-N removal efficiency was adversely affected by the COD/TN ratio. Results from this study prove that these treatment systems have sustained and positive pollutant removal efficiencies, which were achieved even under extremely cold climate conditions and many years after initial construction.
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