| 摘要 |
PROBLEM TO BE SOLVED: To release no wastewater to rives by decomposing organic substances contained in wastewater in respective sections by activated sludge containing anaerobic microbe or aerobic microbe, introducing the supernatant liquid produced in a decomposi tion treatment tank in a lower part of an evaporation tank and diffusing and dispersing the supernatant liquid in the inside, and further evaporating the supernatant liquid to outside air. SOLUTION: Organic solid matter in organic wastewater is decomposed into organic acid by anaerobic microbe in an air-tight section 4 in a decomposition treatment tank 1 and liquefied and then introduced into a section 5 having a ventilation hole and decomposed by activated sludge containing aerobic microbe. The supernatant liquid discharged out of the decomposition treatment tank 1 is introduced to a lower part of an evaporation tank 2 and diffused evenly in the evaporation tank 2 through a large number of small holes formed in a porous pipe 6. The diffused liquid is moved from a filled tank 7 filled with fine gravel or granular ceramics to a filled tank 8 filled with soil or sand in the upper part and further elevated to the surface and then diffused to air. During the time of elevating in layers, the organic matter is further decomposed by soil microbe, so that the treatment is carried out without causing bad effect on environments. |
