APPARATUS FOR PHOSPHOROUS REMOVAL FROM WASTE WATER

摘要

PURPOSE: A phosphorus removal apparatus of sewage and a method thereof are provided to induce the direct reaction of phosphorus ions by adding an inorganic coagulant with relatively low basicity to a first coagulation settling apparatus, and to induce removal of micro flocs by adding an inorganic coagulant with relatively high basicity to a second coagulation settling apparatus. CONSTITUTION: A phosphorus removal apparatus of sewage comprises: a first coagulation settling apparatus composed of a first rapid mixing bath(110), a first low speed mixing bath(120) and a first settling bath(130); and a second coagulation settling apparatus composed of a second rapid mixing bath(210), a second low speed mixing bath(220) and a second settling bath(230). The first rapid mixing bath makes phosphorus ions(-) contained in source water to directly react with metal ions(+) contained in an inorganic coagulant with low basicity by rapidly mixing the source water and the inorganic coagulant with low basicity to form flocs. The second rapid mixing bath makes micro flocs contained in the processed water supplied from the first settling bath to react with an inorganic coagulant with high basicity by rapidly mixing the processed water and the inorganic coagulant with high basicity to form oxalate. [Reference numerals] (AA) Inflow; (BB) Inorganic coagulating agent of low basicity; (CC) Inorganic coagulating agent of high basicity; (DD) Treated water; (EE) Final treated water; (FF,GG) Sludge