How to Remove Heavy Metals from Electroplating Wastewater

The wastewater generated during the electroplating production process mainly comes from cleaning the plated parts, washing the ground, washing the hanging fixtures and plates, and replacing the waste tank solution. Electroplating wastewater contains a lot of heavy metal ions. In order to meet environmental protection requirements, it is sometimes necessary to remove heavy metals from electroplating wastewater. Below, Jiangsu Haipu Functional Materials, a manufacturer of electroplating wastewater treatment, summarizes the methods for removing heavy metals from electroplating wastewater as follows:

1. Heavy metals in electroplating wastewater

The main types of electroplating are copper plating, nickel plating, chromium plating, zinc plating, etc. There are single metal plating types as well as alloy plating. Most of the electroplating wastewater is generated in the cleaning process, and the content of heavy metals is generally not high. The treatment method usually uses physical and chemical methods to precipitate and remove them. For precious metal wastewater, online recycling is generally achieved.

2. Removal of heavy metal copper from electroplating wastewater

Copper plating is divided into electroplating copper and chemical copper. Electroplating copper wastewater is relatively simple, and chemical precipitation can be directly used to achieve standard treatment of copper. Chemical copper wastewater is more difficult to treat, such as ammonia copper and coke copper wastewater. Copper exists in a complexed state, and for chemical copper plating wastewater, it should first undergo chelation treatment before chemical precipitation removal.

3. Removal of heavy metal nickel from electroplating wastewater

The nickel containing wastewater from electroplating includes electroplating nickel and chemical nickel. The treatment of electroplating nickel wastewater is relatively simple, and the use of bipolar induction electrochemical integration technology can achieve standard treatment of electroplating nickel. The difficulty of chemical nickel is greater because there are various chelating agents such as tartaric acid, malic acid, EDTA, etc. in chemical nickel wastewater. Nickel forms stable chelating ions with these chelating agents, and conventional treatment processes are difficult to achieve standard treatment of nickel. For the treatment of chemical nickel wastewater, the first step is to carry out chelation breaking treatment, and then combine with bipolar induction electrochemical integration technology to achieve standard treatment of chemical nickel.

4. Removal of heavy metal chromium from electroplating wastewater

The main source of chromium containing wastewater in electroplating is cleaning water for chrome plating and passivation processes. The treatment of chromium containing wastewater can be achieved through a one-step process using bipolar induction electrochemical integration technology, which includes reduction treatment of hexavalent chromium and precipitation treatment of trivalent chromium to meet standards; The use of bipolar induction electrochemical integration technology can achieve one-step standard treatment of hexavalent chromium. (Please indicate the source YCtech when reprinting)

5. Effect of bipolar induction electrochemical integrated technology on the treatment of electroplating heavy metal wastewater

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