| 摘要 |
PURPOSE:To treat waste water having a comparatively high content of ammonia by using a purifying tank of a simple structure when the ammonia-contg. waste water generated from methane fermentation is passed through the purifying tank provided with an aquatic plant culture bed and purified. CONSTITUTION:When ammonia-contg. waste water generated from methane fermentation is passed through the purifying tank 1 provided with an aquatic plant culture bed, the purifying tank 1 is separated into a raw water receiving zone A, a treating zone B, and an overflowing zone C by two sheetings 2 and 3 through which water can be circulated partially and freely. The lower bed 4 of the treating zone B is formed with gravel and the upper air-permeable bed 5 is formed with soil which is used as the culture soil for growing the aquatic plant 6 such as Eichhornia crassipes. The height of an overflow port 7 provided at the terminal end of the overflowing zone C is made controllable, and the overflow port 7 is lowered as the root of the aquatic plant grows. Consequently, the depth of the air-permeable part of the treating zone B can be regulated. The waste water having a comparatively high content of ammonia is treated with simple operation by using the purifying tank of the simple structure.
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