Treatment method for removing heavy metals from comprehensive electroplating wastewater

Abstract

The invention relates to a treatment method for removing heavy metals from comprehensive electroplating wastewater, belonging to the technical field of industrial wastewater treatment. According to the treatment method, the relatively good integral removal effect of the heavy metals in the comprehensive electroplating wastewater is achieved. The treatment method comprises the following steps: adding a heavy metal ion trapping agent into the comprehensive electroplating wastewater, regulating the pH value of the wastewater to be 3-7, then controlling the temperature at 20-30 DEG C, and adequately reacting to generate chelate from heavy metals in the electroplating wastewater and the heavy metal ion trapping agent, wherein the comprehensive electroplating wastewater contains heavy metals including copper, chromium and nickel; adding a flocculating agent for flocculation, keeping the pH value of a system in the flocculation process at 3-7, carrying out static settlement, filtering to remove precipitates to obtain electroplating wastewater in which copper ions are removed, then regulating the pH value to be neutral, and discharging. According to the treatment method, the relatively good heavy metal removal effect can be achieved, and the total removal rate of the heavy metals in the comprehensive wastewater can reach 96% or more.

Description

Technical field [0001] The invention relates to a treatment method for removing heavy metals in comprehensive electroplating wastewater, and belongs to the technical field of industrial wastewater treatment. Background technique [0002] Electroplating is a process that uses electrochemical methods to decorate and protect metal and non-metal surfaces and obtain some new properties. In the electroplating industry, the commonly used plating types include nickel plating, copper plating, chromium plating, and zinc plating. In the electroplating process, in order to ensure the quality of electroplated products, make the metal coating have a smooth and good appearance and be firmly combined with the plated parts, the dirt on the surface of the plated parts (oil, rust, oxide scale, etc.) must be thoroughly removed before plating Clean up, and clean the adhesion liquid on the surface of the plated parts after plating. Therefore, a large amount of waste water must be discharged during t...

AI Technical Summary

Problems solved by technology

But the processing effect is not ideal

Obviously, the traditional method of chemical precipitation can no longer fully meet the requirements of environmental protection, and the DTC heavy metal collector is produced under the background of new environmental protection concepts and trends of thought. It abandons the traditional concept and develops it from a new perspective. Utilizing the mature technology of other industries, successfully applying capture technology to environmental protection work, and using cheaper materials to synthesize organic capture products, which is in line with the purpose of environmental protection work, has considerable promotion value and long-lasting vitality

In view of the pollution status quo of my country's electroplating wastewater and the problems of treatment methods, on the basis of foreign research work, domestic research on dithiocarbamate and derivatives (DTC) did not start in the 1990s, but, Due to the late start of the research on the use of DTC heavy metal collectors, there is still a lack of systematic research on the factors affecting its application and the scope of application, especially in terms of the stability of heavy metal capture products and the biological toxicity of the collectors after they are discharged into the environment. There are still gaps in the research