| 摘要 |
<p>PURPOSE:To purify waste water containing organic substance in a short time regardless of its BOD concentration, by treating said waste water with a metabolic product in which bacteria are living, organic soluble components in the waste water and fine sludge in the same waste water disposal system. CONSTITUTION:A mixed solution containing activated sludgy substance formed in the step 1 of sludge cultivation and waste water containing organic substance, e.g. night soil or waste water from the processing of marine products, are supplied to the step 2 of bioreaction at the same time and agitated therein to form a new reaction product. A part of said new reaction product is returned to the step 1 of sludge cultivation, while the remainder is separated into a liquid and solid matter. The resulting supernatant liquid is drained outside the waste water disposal system. In the step 1 of sludge cultivation, the mixed solution is held under a physicochemical condition suited to the living and propagation of bacteria to increase the volume of a metaboilc product formed by bacteria and then sent into the step 2 of bioreaction. According to this method, the waste water without being diluted can be purified as such, even if the concentration of BOD in said waste water is large. Hence, the disposal can be performed with small-sized equipment.</p> |
