Device and method for treating electrophoretic coating waste water

Abstract

The invention discloses a device for treating electrophoretic coating waste water. The device comprises a waste liquid regulating pool, a waste water regulating pool and a reaction tank, wherein a pH probe is arranged in the reaction tank; the reaction tank is also connected with an alkali addition pipeline, and is sequentially divided into four reaction chambers, namely a first reaction chamber, a second reaction chamber, a third reaction chamber and a fourth reaction chamber, along a reaction path; a stirrer is arranged in each reaction chamber; the adjacent reaction chambers are communicated with each other through an overflow hole; a discharging port for waste water overflow is formed in the fourth reaction chamber and is connected to an inclined pipe precipitation tank; and a sludge discharging port is formed in the bottom of the inclined pipe precipitation tank, and is connected to a sludge pool. A method for treating the electrophoretic coating waste water mainly comprises the steps of mixture of waste liquid and waste water, phosphorous removal through calcium salt, nickel removal through vulcanization, phosphorous removal through ferric salt, and flocculating settling. According to the device and the method, heavy metal ions such as nickel and zinc in the waste water can be effectively removed, the labor intensity of an operator is reduced, and a system can also stably operate.

Description

technical field [0001] The invention relates to the technical field of environmental protection wastewater treatment, in particular to a treatment method for industrial wastewater. Background technique [0002] Electrophoretic coating technology is widely used in the automobile manufacturing industry due to its unique advantages of high production efficiency, high-quality corrosion-resistant coating, safety and economy. In order to ensure the coating effect, the surface of the coated parts must be pretreated before Carry out chemical conversion coating treatment (phosphating, passivation, etc.), after pretreatment, the coated parts are subjected to electrophoretic primer and then spray topcoat. Coating wastewater contains heavy metal ions such as nickel and zinc. For this type of wastewater, chemical precipitation, ion exchange, physicochemical adsorption, and reverse osmosis are generally used. Due to the limitation of treatment costs, chemical precipitation is the main me...

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Problems solved by technology

[0004] (2) Sewage discharge standards have high requirements on the sedimentation of nickel hydroxide suspended solids in wastewater. It is difficult to meet the strict total nickel discharge standard by using general inclined tube sedimentation

[0005] (3) The intermittent processing method has the problems of large labor volume and labor intensity of workers

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