SYSTEM AND METHOD FOR BIOLOGICAL TREATMENT OF WASTEWATER USING MBR AND ZEOLITE POWDER

摘要

A system and a method for biologically treating sewage/wastewater which maximize nitrification and denitrification by applying zeolite and membrane separation, maximize removal efficiency of organic matter and nitrogen using ion exchange of injected zeolite and biological regeneration thereof within a reactor, and are economical by allowing the zeolite to extend period of clogging the membrane of a membrane separation tank are provided. A system for treating sewage/wastewater comprises: an anoxic tank(2) into which a powder type zeolite is injected after calculating an injection quantity of zeolite according to concentration of ammonia nitrogen contained in sewage/wastewater flown in, and in which ammonia nitrogen is ion-exchanged with the injected powder type zeolite; a membrane separation tank(1) comprising a plurality of membranes(8) for solid-liquid separation of sludge and the ammonia nitrogen ion-exchanged powder type zeolite of the anoxic tank, and an aerator(10) installed under the membranes to accelerate the solid-liquid separation by the membranes; an oxidation tank(4) for decomposing the sludge that is solid-liquid separated in the membrane separation tank, thereby converting the sludge into dissolved organic matters; and an aeration tank(3) consistently regenerating the powder type zeolite transferred together with the sludge converted into the dissolved organic matters in the oxidation tank using nitrifying bacteria, thereby returning the regenerated powder type zeolite to the anoxic tank.