A new method of electroplating wastewater treatment have?

One, the commonly used method of treatment of electroplating wastewater

electroplating wastewater composition is complicated, the processing technology is varied, in general can be divided into chemical method, physical method, physical and chemical method and biological method, etc. In the 1980 s is given priority to with multiple combination technology [ 7] ; At present, to lower costs, technology is relatively mature chemical method is given priority to, at the same time complementary with other appropriate treatment.

chemical method is by far the most commonly used method of treatment of electroplating wastewater. Through cic with certain chemicals to the water, thus changing the nature of the pollutants in water, with water separation or reach the purpose of harmless. Chemical method mainly includes: chemical precipitation, chemical reduction method, chemical oxidation, ferrite and neutralization method, etc.

physical method is to use physical function to separate went into a state of suspension, the pollutants in wastewater, is dealing with the physical chemical properties do not change, the mild processing conditions, safety operation, deep purification of treated water can be recycle. Evaporation and concentration, crystal physics method mainly includes: analysis and separation, etc.

the physical and chemical method is through the physical and chemical combination, make the waste water purification. The commonly used physical and chemical method are: ion exchange method, electrolytic process, activated carbon adsorption, clinoptilolite adsorption method, adsorption method of maifan stone, etc.

the biochemical method is mainly used microbial life activities of the process, to transfer and transformation of pollutants in wastewater, so that the wastewater purification methods, is a high-tech treatment of electroplating wastewater by biological technology. Activated carbon - Biological membrane method is the enrichment and biological activated carbon membrane degradation, is expected to become the containing cyanide wastewater treatment is one of the promising methods [ 8] 。

2, using natural plant material can also be the treatment of electroplating wastewater at home and abroad are

by physical method, chemical method and biological method treatment of electroplating wastewater research a lot, but these methods exist consumption of large, high cost and defects such as regeneration will produce secondary pollution. By using natural plant material absorption, degradation, flocculation, sedimentation and other physical or chemical method can effectively remove a variety of metal ions in electroplating wastewater. This method is simple and reliable operation, less investment, low running cost. Modified peanut shells, wood chips, coconut shell and other natural plant material has large specific surface area, effectively suspended solids and organic matter in waste water adsorption, flocculation, sedimentation and remove; Wetland plant root and stem leaf can absorb, enrichment and degradation of Cr plating wastewater and zinc, Fe, Mn, Ni, and heavy metals such as Cu, and then to electroplating wastewater discharge standard. Similar to the natural plant materials and algae, modified bentonite, wheat straw, corn shaft barley, corn stalks, rice husk, shell, wood chips, palm branch, sawdust, tree bark, leaves, bananas, wood pulp, bagasse, wood pulp, aquatic plants, etc. Of these natural plant material is life, industrial waste, most refuse to be used as a fuel or waste residues, caused great waste of natural resources. Recycling energy conservation and environmental protection not only, and to achieve the effect of using waste treat waste. In recent years, the natural plant material used with other wastewater treatment have been reported in the study of [ 9 - 11] 。