Synergistic treatment technology for electroplating sewage

Abstract

The invention discloses a synergistic treatment technology for electroplating sewage. Dewaxing wastewater, nickel-containing wastewater and chromium-containing wastewater are discharged into a mixingtank and are mixed to achieve the purpose of treating wastes with wastes in order to save the cost, and a COD treatment agent and a nickel treatment agent are added to further deeply degrade chemicalcomponents in sewage in order to further reduce pollution components. Pretreatment water, plated member cleaning water and other comprehensive sewage in the electroplating process are synergisticallytreated, the wastes are treated with wastes to save the cost, the special COD treatment agent and the special nickel treatment agent are added according to the water quality condition to perform advanced treatment in order to reduce non-standard components in the sewage, so the sewage can be stably discharged after reaching the standards, the sewage treatment process in electroplating production is simplified, the production cost is saved, and the treatment efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of electroplating sewage treatment, in particular to a collaborative treatment process for electroplating sewage. Background technique [0002] The sources of electroplating sewage are generally: pre-treatment water, plating parts cleaning water and other comprehensive sewage. Since Table 3 of the electroplating sewage discharge standard was implemented, the sewage treatment cost of many electroplating plants has increased, but the discharge standard cannot be met stably. Among them, the pollutants with the most expensive treatment cost and the easiest to exceed the standard are COD, Ni 2+ 、Cr 6+ ; COD is easy to exceed the standard because the electroplating wastewater contains wax removal wastewater, which contains a large amount of organic matter, which is not easy to remove with general chemical methods; Ni 2+ It is easy to exceed the standard because there is electroplating nickel wastewater in the el...

AI Technical Summary

Problems solved by technology

Since Table 3 of the electroplating sewage discharge standard was implemented, the sewage treatment cost of many electroplating plants has increased, but the discharge standard cannot be met stably. Among them, the pollutants with the most expensive treatment cost and the easiest to exceed the standard are COD, Ni 2+ 、Cr 6+ ; COD is easy to exceed the standard because the electroplating wastewater contains wax removal wastewater, which contains a large amount of organic matter, which is not easy to remove with general chemical methods; Ni 2+ It is easy to exceed the standard because there is electroplating nickel wastewater in the electroplating wastewater, and the nickel hypophosphite in it is not easy to remove because of its high solubility product; Cr 6+ The high cost of treatment is due to the need to use a large amount of acid to adjust the pH and then react with sodium metabisulfite, and then neutralize it with sodium hydroxide, which consumes more chemicals