BIOCHEMICAL TREATMENT OF WASTE WATER

摘要

PURPOSE:To make efficient removal of eutrophic material by using blast furnace water granulated powder as a carrier to be immobilized with activated sludge to increase the concn. of the activated sludge and biochemically treating waste water with 5 stages while controlling the action of the activated sludge with oxidation reduction potential (ORP) as an index. CONSTITUTION:The waste water is mechanically stirred in a treatment tank where the activated sludge and the blast furnace water granulated fine powder as the carrier to be immobilized with the activated sludge exist and the return sludge is injected therein to control ORP to -100--300mV, then part of a phosphorus compd. is released from the activated sludge in the 1st stage. ORP is controlled to +100-+150mV by aeration and the phosphorus compd. is excessively taken into the activated sludge by effecting the oxidation decomposition of BOD and oxidation of an ammonia compd. in the 2nd stage. ORP is controlled to -50--150mV to reduce NOX to gaseous nitrogen by executing stirring under the partial injection of a hydrogen donator in the 3rd stage. The quantity of the air to be blown is adjusted to control the ORP of the ensuing state to -50--150mV in the 4th stage. The sludge is settled in the 5th stage.