| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a new technique capable of setting a filtering flux stably high in dynamic filtering and also capable of keeping suspended solids stably low in filtered water, and thereby capable of reducing produced amount of sludge. SOLUTION: A method and an apparatus for purifying organic waste water wherein the organic waste water is treated biologically in a biological reaction process under the coexistence of biological sludge and iron or aluminum hydroxide floc, and filtered water is taken out from the sludge and the floc through a solid-liquid separation process by means of a dynamic filter membrane and meanwhile a part of the sludge through the solid-liquid separation process or sludge in the biological reaction process is sucked out, and metal hydroxides and polymers outside of bacterial cells in the biological sludge are eluted by adding an acid thereto, and slurry containing metallic ions of iron or aluminum being thus produced is returned to the biological reaction process.</p> |
