Treatment method and treatment device of electroplating mixed water

Abstract

The invention relates to a treatment method of electroplating mixed water. The method comprises the following steps: (1) collecting the electroplating mixed water in a water collecting tank, adjusting the pH value to be 2 to 3, hoisting the electroplating mixed water from the water collecting tank into a micro-electrolytic reactor, carrying out the micro-electrolysis by virtue of iron-carbon filler, returning the electroplating mixed water to the water collecting tank from the micro-electrolytic reactor, circulating the electroplating mixed water until hexavalent chromium ions in the electroplating mixed water are reduced to trivalent chromium ions, and ending the circulation stage; (2) enabling the mixed water after the micro-electrolysis to enter a coagulation reactor, stirring the mixed water, adjusting the pH value to 10 to 12, and sequentially adding a coagulant, a coagulant aid and a sodium hypochlorite solution; (3) stopping stirring, standing and precipitating; (4) dehydrating the mud-water mixture in the coagulation reactor after the water quality is qualified, discharging the water, adjusting the pH value of the discharged water to 6 to 9, and externally transporting mud cakes. The invention also discloses a device for realizing the method. By adopting the treatment method and the treatment device, heavy metals and organic pollutants in the electroplating mixed water can be simultaneously and efficiently removed.

Description

technical field

[0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for electroplating mixed water.

[0002] The invention also relates to a device for carrying out the method described above. Background technique

[0003] As one of the important basic industries in my country, the electroplating industry is widely used in the production of industrial and civil products in many fields such as electronics, light industry, machinery and so on. With the development of electroplating technology, chemicals such as dispersants, complexing agents, thickeners, etc. are continuously added in the production process to make heavy metal ions exhibit good water solubility and dispersibility in the solution. Thus, the electroplating production process and the flushing process form an organic electroplating mixed water (the main pollutants of which are heavy metals and organic pollutants). This kind of electroplating mixed w...

Examples

Embodiment

[0044] The electroplating mixed water in the electroplating production workshop of a factory includes electroplating wastewater and organic wastewater. The electroplating wastewater mainly comes from the wastewater generated during nickel plating and chrome plating in the electroplating workshop and flushing wastewater. The main heavy metal ions contained in it are Ni 2+ 、Cr 6+ and Cr 3+ ; The organic wastewater comes from the wastewater formed by adding ammonium dichromate solution, complexing agent, thickener, etc. during the cleaning process of the cleaning workshop, and its heavy metal ions mainly contain Cr 6+ and Cr 3+ . The treatment water volume of electroplating mixed water is 20m 3 / d, the main pollutants are heavy metals (nickel, chromium) and organic pollutants (COD). After treatment, the effluent is discharged into the local sewage treatment plant. The raw water quality is shown in Table 2.

[0045] Before the transformation, the electroplating mixed water us...

technical field

[0001] The invention belongs to the field of waste water treatment, and in particular relates to a treatment method for electroplating mixed water.

[0002] The invention also relates to a device for carrying out the method described above. Background technique

[0003] As one of the important basic industries in my country, the electroplating industry is widely used in the production of industrial and civil products in many fields such as electronics, light industry, machinery and so on. With the development of electroplating technology, chemicals such as dispersants, complexing agents, thickeners, etc. are continuously added in the production process to make heavy metal ions exhibit good water solubility and dispersibility in the solution. Thus, the electroplating production process and the flushing process form an organic electroplating mixed water (the main pollutants of which are heavy metals and organic pollutants). This kind of electroplating mixed w...

Examples

Embodiment

[0044] The electroplating mixed water in the electroplating production workshop of a factory includes electroplating wastewater and organic wastewater. The electroplating wastewater mainly comes from the wastewater generated during nickel plating and chrome plating in the electroplating workshop and flushing wastewater. The main heavy metal ions contained in it are Ni 2+ 、Cr 6+ and Cr 3+ ; The organic wastewater comes from the wastewater formed by adding ammonium dichromate solution, complexing agent, thickener, etc. during the cleaning process of the cleaning workshop, and its heavy metal ions mainly contain Cr 6+ and Cr 3+ . The treatment water volume of electroplating mixed water is 20m 3 / d, the main pollutants are heavy metals (nickel, chromium) and organic pollutants (COD). After treatment, the effluent is discharged into the local sewage treatment plant. The raw water quality is shown in Table 2.

[0045] Before the transformation, the electroplating mixed water us...

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