Zero discharge of wastewater refers to the general industrial wastewater reused in the production process, the wastewater and pollutants will be highly concentrated into the final wastewater through the exclusive wastewater treatment process for recycling, or the use of proprietary equipment to filter out insoluble substances and recycle, to achieve no waste liquid discharge factory. Salts and pollutants in water are concentrated and crystallized or filtered waste residues are discharged in solid form from the plant to the landfill of the waste treatment plant or recycled as useful chemical raw materials.

According to the data, during the Eleventh Five-Year Plan period, the urban sewage treatment rate in China increased from 51.95% to 75.25%, and increased by 23.3%. During the Twelfth Five-Year Plan period, according to relevant policies, by 2015, the sewage treatment rate of cities and towns in the eastern region will not be less than 85%, that of the central region will not be less than 80%, and that of the western region will not be less than 70%. Looking forward to the future, the sewage treatment industry will continue to increase in quantity. 

With the stricter requirement of quality, the upgrading and transformation of wastewater treatment industry will be promoted. Zero discharge of waste-water treatment is the general trend in the future.  

Moreover, Jiangsu, Zhejiang and Shanghai regions strictly implement the requirements of the "Emission Regulations", take solid measures to strictly implement the zero phosphorus and nitrogen emission requirements. 

In the process of choosing zero discharge system for wastewater treatment, we should consider the water quality conditions, treatment efficiency, cost and treatment standards. For the zero discharge project of industrial wastewater, we have relevant technological solutions.