METHOD AND APPARATUS FOR TREATING ORGANIC DRAINAGE AND SLUDGE

摘要

The purpose of the present invention is to provide a method and apparatus for treating organic drainage or sludge which enable formation of sludge having a comparatively low content of heavy metals with ease and at a low cost and further recovery of a useful valuable substance at the same time by separating and removing heavy metal derived particles from organic drainage containing high concentration organic substances, phosphorus and nitrogen and efficiently recovering valuable particles such as MAP. One embodiment of the present invention refers to a method of treating organic drainage and sludge comprising an anaerobic digestion treatment step, which further comprises separating heavy metal derived compound particles in a particles-in-liquid state from two or more types of fine particles existing in the sludge of the anaerobic digestion treatment step utilizing a separation means comprising a fine particle classification means utilizing at least two properties of specific gravity, particle diameter, surface charge, magnetism and wettability of the particles.