Coking wastewater is generated from metallurgy industry and it contains many highly toxic substances. Because the coking wastewater would bring about severe environmental pollution, it is best to reuse it as circulating cooling water. However, there are large quantities of ions in coking wastewater, which would cause serious corrosion to the pipe and the devices in the process of recycling. Therefore, desalting techniques are necessary for the reused of coking wastewater. Electrosorption technique (EST), as a new type of water treatment technology, can meet the economic benefits of water treatment technology. It also can achieve better water quality and reliability standards which have never been achieved before. In this paper, a new electrosorption device was invented and it was used for desalting of coking wastewater. The main parameters affecting the electrosorption of ions including voltage, electrosorption time, pH value, temperature and electric current have been investigated in detail. Under the optimized experimental condition, after electrosorption process, a salt removal rate of 75% was obtained. The quality of effluent could satisfy the criterion of industrial circulating cooling water (GB 50050-2007) and could be reused as the circulating cooling water in coking plant.
The research progress of water treatment technology on recirculated cooling water
