Printed circuit board wastewater biochemical treatment process

Through a biochemical treatment process of printed circuit board wastewater, chemical agents such as acid, iron salt, alkali and sodium sulfide are used to break and precipitate, and modified silica and PAM are added to the flocculation tank, which solves the problem of incomplete copper ion removal in the prior art and achieves efficient and simple wastewater treatment effect.

CN119707203APending Publication Date: 2025-03-28GUANGDE EAST CHINA ELECTRONIC CIRCUIT DEV CO LTD
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Patent Information

Application Number
CN202510178334.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-18
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the prior art, copper ions are not removed thoroughly in the wastewater of printed circuit boards, resulting in poor treatment effect, high cost and complex operation.

Method used

A biochemical treatment process for wastewater on printed circuit boards is adopted, including collecting copper-containing wastewater, rupture reaction through the combination of acid and iron salt, and then forming a precipitate through the treatment of alkali and sodium sulfide, and finally adding modified silica and PAM to the coagulation and flocculation tank to achieve the complete removal of copper ions.

Benefits of technology

This process can efficiently remove copper ions in the wastewater of printed circuit boards. The copper ions in the treated wastewater are <0.05mg/L. The method is simple, easy to operate, and no secondary pollution occurs.

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Abstract

The invention belongs to the technical field of wastewater treatment, and provides a printed circuit board wastewater biochemical treatment process which comprises the following steps: step 1, collecting copper-containing wastewater in a printed circuit board wastewater pool; step 2, introducing the collected copper-containing wastewater into a regulating tank, and introducing the copper-containing wastewater into a pH regulating tank after homogenization and average regulation; step 3, adding acid into the pH regulating tank, regulating the pH value, and entering a complex breaking reaction tank; step 4, adding ferric salt into the complex breaking reaction tank, stirring, and entering a pH callback tank; 5, alkali is added into the pH callback tank, the pH value is adjusted, and the wastewater enters a sedimentation tank; step 6, putting sodium sulfide into the sedimentation tank, and entering a coagulation tank; step 7, adding PAC and modified silicon dioxide into the coagulating basin, and enabling the mixture to enter a flocculation basin; 8, PAM and modified silicon dioxide are put into the flocculation basin and enter a sedimentation basin, and treated wastewater is obtained; the method is simple and convenient to operate, and copper ions in the treated wastewater are less than 0.05 mg / L.
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