| 简介 |
PROBLEM TO BE SOLVED : To provide a new organic waste water treatment method which can reduce the influence of organic waste water on treated water while remarkably reducing the generation of surplus sludge generated with biological treatment for the organic waste water.
SOLUTION : The organic waste water treatment method treats waste water by subjecting organic waste water to biological treatment in a biological treatment tank, thereafter, subjecting a mixture produced by the biological treatment to solid-liquid separation into treated water and sludge, subjecting a part or the whole of the sludge subjected to the solid-liquid separation to solubilizing treatment of solubilizing organic matter in the sludge, and subsequently, returning the produced solubilized liquid to the biological treatment tank. In the method, (1) phosphoric aid in the treated water obtained by subjecting the mixture produced by the biological treatment to the solid-liquid separation is adsorbed on an adsorbent, (2) the phosphoric acid adsorbed on the adsorbent is desorbed from the adsorbent with an alkali aqueous solution, (3) alkaline-earth metal is added to the alkali aqueous solution containing the phosphoric acid to separate the phosphoric acid as a phosphate, and (4) the solubilization treatment is performed using the alkali aqueous solution after the separation of the phosphoric acid.
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