For a long time, problems such as heavy water and light mud, difficult disposal of sludge, and difficult conversion of resources have been difficult problems in the field of water treatment and even environmental protection. In June 23, the National Development and Reform Commission and the Ministry of Housing and Urban-Rural Development issued the 14th Five-Year Plan for the Development of Urban Sewage Treatment and Resource Utilization, proposing equal attention to sludge and water, speeding up the improvement of sludge disposal facilities, solving the difficulties of sludge disposal, achieving harmfulness, and promoting resource utilization. Sludge is a by-product of the biochemical and physicochemical treatment of sewage. Because sludge contains a large number of pollutants in sewage, the risk of environmental impact is greater.

The sludge has the characteristics of high water content, high organic matter, fine particles, low density and hydrophilicity, and is easy to be transported by pipeline, but the dewatering performance is poor. Sludge disposal refers to the final disposal of sludge after dehumidifying or removing organic impurities and killing pathogens. On the one hand, through concentration and dehydration, the water content of the sludge is reduced as much as possible, which is easy to transport; The stability of organic matter can avoid secondary pollution caused by corrosion. The industry believes that the reduction of dehydration and drying depth is an important basis for sludge treatment to better realize the comprehensive utilization and final disposal of sludge. In addition, it should be noted that the sludge can be roughly divided into three categories according to the source: water supply sludge, domestic sewage sludge and industrial wastewater sludge.

Different industries, different sources of sludge water content is different, need to carry out a certain dehydration treatment. Sludge conditioner is a chemical agent that can change the surface structure of sludge, reduce the solid surface load of sludge, reduce the specific surface area of sludge and destroy the structure of bacteria. The main components are inorganic compounds, sludge surface structure modifier, degreaser, wall breaking agent, sludge surface treatment agent, sludge stripping agent and so on. Combined with the plate and frame type mud press, the moisture content of the sludge can be greater than 90% ~ 40%-60%, and the sludge reduction can be fully realized.