TREATMENT METHOD FOR ACID OR WASTE WATER OF SEMICONDUCTOR

摘要

PURPOSE: A method for treating acid or waste water chemically and biologically is provided which may reduce the capacity of settling tank and remove organic material in acid or waste water. CONSTITUTION: The process comprises the 1st step for neutralizing raw water, the 2nd step for processing neutralized water with an enzyme preparation, the 3rd step for separating clarified supernatant liquid from sludge by settling, and the 4th step for discharging clarified supernatant liquid after the filtration. For example, hydrogen peroxide containing raw water is neutralized with calcium hydroxide in a reactor(100, 200). Neutralized water is mixed with a microorganism to remove organic matter. Treated water with the enzyme preparation is processed with a coagulant(400), precipitated in a settling tank and separated clarified supernatant liquid from sludge(500). The removal rate of BOD and suspended solid increases about above 50% and about above 80% respectively by this method.