Circuit board production wastewater treatment method

Abstract

The invention discloses a circuit board production wastewater treatment method. A system used in the method comprises an ammonia nitrogen wastewater pool, a cyanide-containing wastewater pool, an organic wastewater pool, a nickel-containing wastewater pool, a comprehensive adjusting pool, a first reaction pool, a second reaction pool, a third reaction pool, a fourth reaction pool, a fifth reactionpool, a sixth reaction pool, a first sedimentation pool, a second sedimentation pool, a comprehensive pH back-regulating pool, a hydrolysis and acidification pool, a contact oxidation pool, a secondary sedimentation pool, an intermediate pool, a sand filter tower, a clean water pool, an ammonia stripping tower, an ammonia absorption tower, an alkaline cyanide breaking pool, an acidic cyanide breaking pool, a sand filter, an ion exchanger and a dosing device capable of preparing an alkaline agent, NaClO, ferrous iron, hydrogen peroxide, PAC and PAM flocculants, recapturing agents and the likeand feeding the prepared reagents into corresponding pools. According to the invention, the quality characteristics of circuit board production wastewater are refined and classified; the process layout of the method is reasonable, and good cooperative treatment effect is realized; the whole treatment system is stable and reliable in operation; wastewater treatment efficiency and a resource reuse rate are greatly improved; wastewater treatment cost is reduced; and effluent quality is improved.

Description

technical field [0001] The invention relates to the technical field of circuit board wastewater treatment, in particular to a method for treating circuit board production wastewater. Background technique [0002] A certain amount of production wastewater will be discharged during the production of circuit boards, and the discharged wastewater contains acid and alkali, CODcr, CN － , Cu, Ni and other pollutants, among which CN － , Cu and Ni are highly toxic pollutants. If they are discharged directly without treatment, they will seriously pollute the surrounding environment. Taking the wastewater station of a factory as an example, the amount of wastewater treated is 220m 3 / d, which reuses 100m 3 / d, up to standard discharge 120m 3 / d; run 22 hours a day, with an hourly processing capacity of 10t / h. Wastewater is classified as follows: [0003] serial number Wastewater type Wastewater volume main pollutants 1 Comprehensive wastewater 180t / d Cu 2...

AI Technical Summary

Problems solved by technology

[0004] However, the existing sewage treatment station only has acidification + sedimentation + filtration process, and the wastewater classification is not thorough, only the comprehensive wastewater and organic wastewater are separated

Due to the many types of pollutants in the wastewater, it is difficult to effectively control the pollutants to meet the standards, the efficiency of wastewater treatment is difficult to improve, and the resource recycling rate is low, resulting in a certain degree of waste, which is not conducive to the implementation of environmental protection work

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