Fremgangsmåde til behandling af organisk spildevand

摘要

A novel method for treating an organic waste water is provided, which is capable of separating and recovering phosphorous components in a liquid or solid form. According to the method of the present invention, reuse of phosphorous components can be facilitated, while the content of phosphorous components contained in a large quantity of a primary treated liquid can be reduced. The following steps are characteristic in the method of the present invention: (1) an aeration step for aerobically treating a waste water; (2) a solid-liquid separation step for separating the waste water after the aeration into a primary treated liquid and a primary sludge; and (3) a phosphorous component release step for releasing phosphorous components from the separated primary sludge to a liquid phase; and a solid-liquid separation step for separating the primary sludge after releasing the phosphorous components into a secondary treated liquid containing the released phosphorous components and a secondary sludge free from phosphorous components.