Ferrous sulfate and sodium bisulfite method are currently used to treat hexavalent chromium wastewater commonly used methods, but their treatment process there are significant differences, South China University of Technology School of Mechanical and Automotive Engineering, Huai Ji Dengyun Auto Parts Co., Ltd. Limited Company researchers through experimental research, contrast, pointed out in different occasions using the appropriate method can get a better overall effect, so as to practice the practice of plating chromium wastewater treatment to provide a reference.

Ferrous sulfate and sodium bisulfite can effectively deal with chrome plating wastewater, but the ferrous sulfate treatment is more economical, simple operation, high efficiency, the disadvantage is the sludge; the use of sodium bisulfite treatment highlights the advantages of less sludge , But the cost is slightly higher than the ferrous sulfate treatment, and the processing time is longer.

As the ferrous sulfate method does not need to adjust the pH before the treatment, high efficiency, more suitable for a large number of waste water generated continuous treatment occasions; sodium bisulfite method for a long time, the operation is more complex, but the sludge generated less Suitable for small electroplating factory, the amount of waste water is not too much, need to regularly deal with the occasion.