| 摘要 |
PROBLEM TO BE SOLVED: To prevent the pollution of water in a flowing water passage (1) by cleaning sewage Q1 flowing in the flowing water passage (1) such as rivers, agricultural waterway, a rainwater drain passage to allow the cleaned water to flow in the flowing water passage (1). SOLUTION: In the cleaning method for sewage Q1, one or more stages of cleaning apparatuses each stage having a cleaning part (2), an outlet and inlet part (3), sewage Q1 and treated water Q2 are arranged. A part of aerobic zone treated water (return flowing water Q3) of the upper stage is supplied to the anaerobic zone of the cleaning part 2 and the carbon source of the sewage Q1 is utilized to perform denitrification. COPYRIGHT: (C)2004,JPO
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