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Elementary Analysis on the Factors of Exceeding the Standard of COD in Electroplating Wastewater

by:BOQU     2023-03-14
In fact, the above-mentioned wastewater treatment also has an impact on the electroplating wastewater exceeding the standard, so I won’t explain it here. In this chapter, water quality online monitor manufacturers will learn about the other two factors with you in the future. The specific reasons are as follows: 1. Use inorganic substances for electroplating, for example: zinc oxide is used for galvanizing. In recent years, in order to improve the efficiency and quality of electroplating, various additives have been used in large quantities. These additives can improve leveling, brightness, dispersion, deep plating, etc., improve the appearance quality and production efficiency of the coating, and also reduce labor intensity (in the past, the coating was manually polished). 2. In the post-treatment process of electroplating, in order to improve the corrosion resistance of the coating, sealing treatment is often done, and some sealing agents are also organic substances. Electroplating Wastewater COD Emission Control Requirements According to the 'Electroplating Pollutant Discharge Standard' (GB21900-2008) issued by the State Environmental Protection Administration and the General Administration of Quality Inspection and Testing, the enterprise COD emission limit is 80mg/L. Difficulties in electroplating wastewater COD compliance analysis The wastewater treatment systems of most electroplating enterprises are aimed at the symbolic pollutants of the electroplating industry; activated carbon method: effective in removing COD, but activated carbon is quickly saturated and fails, and there is no mature method for its regeneration; membrane method : It can intercept the macromolecules of organic matter, but the COD will be higher when the concentrated solution is discharged; ultraviolet method: some units believe that the treatment of electroplating wastewater with ozone, ultraviolet rays and activated carbon has obvious effects through research. Under the condition of L, it was reacted for 30 minutes, and the COD removal rate was greater than 72% after being filtered by activated carbon. Analyzing the above conclusions, it can be seen that the effect is well received by most users; Biochemical method: In order to reduce the COD index, the electroplating wastewater is generally treated first by chemical treatment and then by biochemical treatment.
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