Printed circuit board copper-containing wastewater treatment process

Abstract

The invention provides a printed circuit board copper-containing wastewater treatment process which comprises the following steps: S1, collecting printed circuit board copper-containing wastewater in a waste liquid pool, adding a NaClO solution into the wastewater, and adjusting the pH value of the waste liquid to 4.0-6.0; S2, introducing the wastewater treated in the step S1 into an irradiation tank, and irradiating the wastewater by using ultraviolet light; S3, introducing the wastewater treated in S2 into a complex breaking tank, adding a Fenton reagent into the complex breaking tank, and conducting stirring; S4, introducing the wastewater treated in S3 into a sedimentation tank, and simultaneously adding NaOH and Na2S with the weight ratio of 5:4 into the sedimentation tank; S5, introducing the wastewater treated in S4 into a coagulating basin, and adding PAC into the coagulating basin; S6, introducing the wastewater treated in the step S5 into a flocculation basin, and adding PAM into the flocculation basin; and S7, carrying out advection precipitation to obtain treated wastewater. The copper ions in the copper-containing wastewater in the production of the printed circuit board can be effectively removed.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a process for treating copper-containing wastewater from the production of printed circuit boards. Background technique [0002] Printed circuit board (PCB) electroplating copper plating needs to use tap water to wash inorganic metal ions, organic matter and colloids and other substances on the circuit board, so the discharged wastewater contains a large amount of copper ions, and wastewater treatment is required. The main forms of copper ions in the plating solution are copper sulfate, copper pyrophosphate, cuprous cyanide, etc. The damage of copper ions to the water body is that when it exceeds a certain amount, it will inhibit the natural purification of the water body. For example, after copper-containing wastewater enters the farmland, copper will also be enriched in the soil, deteriorating the soil quality, and will be absorbed by plants, polluting crops, and ...

AI Technical Summary

Problems solved by technology

EDTA is easy to form a stable complex with copper, which increases the difficulty of copper ion degradation, and the simple use of sodium hypochlorite to break the complex has poor effect

[0005] (2)Na 2 S is an alkaline substance, put Na 2 After S, the pH further increased, and the pH was too high to cause the Al(OH) produced by adding PAC to water 3 The colloid is dissolved and needs to be flocculated and precipitated by adding H 2 SO 4 Reverse the pH to 6~9, Al(OH) will be produced during the reverse adjustment process 3 Precipitation, resulting in white milky wastewater, poor purification effect, and the consumed Na 2 S and H 2 SO 4 The quantity is large, the production cost is high, the treatment of copper ions is not complete, and the operation of the staff is complicated