RECYCLE APPARATUS OF ELECTRODEPOSITION PAINTING WASTE WATER

摘要

PURPOSE: To reduce the supply amt. of water while enhancing treatment efficiency by constituting the whole of a system treating a large amt. of waste water generating in the electrodeposition painting of the surface of a car body as a closed system and providing an impurity solidifying and removing device, an ion removing device and a replenishing water supply device. ;CONSTITUTION: The confluent waste water of the first pretreated waste water after an alkali degreasing process using first washing water 25 and the second pretreated waste water after a chemical forming treatment process using second washing water 26 is once stored in a raw water tank 2 and introduced into an impurity solidifying and removing apparatus 31 containing a biological treatment device 4 to solidify impurities in waste water to remove them. Next, this treated water is introduced into an ion removing apparatus 32 equipped with reverse osmosis membrane treatment tanks 8-10 and an ion exchanger 11 to remove impure ions in the treated water. Replenishing water having purity and ion concn. of predetermined values or more is appropriately supplied to the ion removing apparatus 32 from a replenishing water supply device 6 in order to replenish water discharged during treatment.;COPYRIGHT: (C)1996,JPO