A Static Treatment Process for Electroplating Wastewater Based on Redox Reaction

Abstract

The invention discloses a static treatment process of electroplating wastewater based on oxidation-reduction reaction, which comprises the following steps: step 1: adjusting the pH value of wastewater; step 2: oxidation reaction; step 3: adjusting the pH value of wastewater again; step 4: adding a flocculant Step 5: Reduction reaction; Step 6: The supernatant obtained in Step 5 is recycled or discharged, and the precipitate obtained in Step 2, Step 4, and Step 5 is dried at 105° C. for 24 hours, and the dried large particle precipitate is Bag after crushing. The invention can react at the pH with the best effect of sodium hypochlorite, and increase the size of the precipitate through the reaction at the optimal pH of the flocculant; it can perform the reduction reaction with the activated carbon obtained by the impregnation-sintering method to ensure that the supernatant meets the discharge requirements.

Description

【Technical field】 [0001] The invention relates to the technical field of electroplating wastewater, in particular to the technical field of electroplating wastewater static treatment process based on redox reaction. 【Background technique】 [0002] As an important surface engineering technology, electroplating is a process that uses electrochemical methods to decorate, protect and obtain certain new properties on metal and non-metal surfaces. Because electroplating can be used for cosmetic treatment of metal surfaces, it can obtain metal films with better decoration, functionality and protection on various substrates. Therefore, the electroplating industry can serve all walks of life, such as metallurgy, vehicles, military industry, electrical appliances, aerospace, etc. It is one of the indispensable industries, and it has not been replaced by other technologies in all aspects, but is constantly developing new technologies and new techniques. At present, the scale, output ...

AI Technical Summary

Problems solved by technology

The utilization rate of metal raw materials of most plating types in my country's electroplating enterprises is lower than that of foreign countries

[0009] (2) Electroplating wastewater treatment needs to be further optimized

In actual operation, most of the wastewater discharge does not meet the national discharge standards, and some raw materials are not fully utilized but simply treated, which not only leads to direct contact of toxic substances with the environment, pollutes water bodies, and causes irreparable impact on people's production and life

[0010] (3) Due to the influence of process technology, production equipment and other factors, the unit water consumption of each plating type is relatively large, and the cost and benefit of electroplating production are not directly proportional