Currently for heavy metal pollutants commonly used methods are, chemical precipitation, chelation precipitation method.
Chemical precipitation: chemical precipitation is to make the wastewater in the dissolved state of heavy metals into insoluble heavy metal compounds, including neutralization and precipitation method and sulfide precipitation method.
Chelating precipitation method: add heavy metal trapping agent M1 to make it happen chelating precipitation. The method has a good effect on the stability of the effluent to meet the standard, wide range of conditions, no secondary pollution, low water content of sludge, sludge is easy to recycle, while the equipment requirements are simple, but the heavy metal capture agent for the treatment of complexed nickel wastewater, you need to break the complex, can not be generated directly to the precipitation.