TREATMENT APPARATUS FOR WASTE WATER USING MANUFACTURE OF SEMICONDUCTOR

摘要

PURPOSE: An apparatus for treating waste water using the manufacture of semiconductor is provided to stabilize the distribution of predominant species of microorganism by preventing the unstability of microorganism resulting from return sludge in an aeration tank and increase the treatment efficiency of wastewater. CONSTITUTION: The apparatus comprises a front aeration tank(110) consisted of 1st(111) and 2nd(115) aeration tanks in which bacteria or free-swimming ciliates and Protozoa such as suctoria grow as a dominant species, a rear aeration tank(150) consisted of 3rd(151) and 4th(155) aeration tanks in which a microorganism such as Protozoa and Metazoa grow as a dominant species, and a settling tank(400). Organic matter in influent water(200) flowing into the front aeration tank(110) is removed by the bacteria and Protozoa. In the rear aeration tank(150), the bacteria and Protozoa are removed by the Metazoa. Treated water(300) is precipitated in the settling tank(400) to give supernatant liquid and sludge. A part of the sludge is recycled by the 1st recycle part(600) to stabilize the distribution of microorganism in the front aeration tank(110) and the rear aeration tank(150). Preferable segregation ratio of the 1st(111) aeration tank to the 3rd(151) aeration tank is 9:1.