Method for treating electroplating integrated waste water

Abstract

The invention relates to a method for treating electroplating integrated waste water. Aiming at overcoming the defects that the precipitation of heavy metal is not complete and treated electroplating waste water is difficult to reach a standard of the prior method of adopting a sodium hydroxide solution to regulate the pH value of the electroplating integrated waste water to precipitate the heavy metal in the electroplating waste water so as to treat electroplating integrated waste water, the invention provides the method for treating the electroplating integrated waste water, which ensures heavy metal precipitates completely and the treated electroplating waste water can reach a standard and is easy to operate and control. The method comprises the following steps: (1) the electroplating waste water is filled into an electroplating integrated waste water pond, and lime slurry is added and stirred to the electroplating waste water (2) ferrous sulfide is added to the supernatant fluid of the electroplating waste water treated by the lime slurry; (3) a PAC flocculating agent is added and stirred to the electroplating waste water; (4) a PAM flocculating agent is added to the electroplating waste water and stirred to the same for a while for naturally precipitation; and (5) the supernatant fluid of the electroplating waste water which reaches the standard is drained off, precipitate press filter is carried out, and filter liquid returns to the electroplating integrated waste water pond.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, in particular to an electroplating comprehensive wastewater treatment method. Background technique [0002] So far, the treatment of electroplating wastewater is still a long-standing problem. Now it is widely used to adjust the pH value of electroplating comprehensive wastewater with sodium hydroxide solution, so that heavy metals such as copper, nickel, trivalent chromium, zinc, etc. become hydroxides to precipitate, so that there is less precipitation and the waste residue is easy to handle. However, due to the inconsistency in the complete pH value of various heavy metal precipitation, and the solubility product of hydroxide is not very small, resulting in incomplete precipitation of heavy metals, it is difficult for the treated electroplating wastewater to meet the standard. If the complete pH value of metal nickel ion precipitation is > 9.5, generally the pH valu...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the disadvantages that the existing electroplating wastewater treatment uses sodium hydroxide solution to adjust the PH value of the electroplating comprehensive wastewater, so that the heavy metal precipitation in the electroplating wastewater is not complete, and the electroplating wastewater after treatment is difficult to reach the standard. It provides A comprehensive electroplating wastewater treatment method with thorough precipitation of heavy metals, up-to-standard electroplating wastewater, simple operation and easy control