Cationic polyacrylamide is generally used in the later stage of biochemical sludge treatment process.
Reclaimed water in municipal wastewater treatment is a water source with great changes in water quality and very difficult to treat. The concentration of total dissolved solids, COD, BOD, total silicon, ammonia and some other pollutants changes very frequently. In addition, the wastewater before treatment contains high concentration of organic matter, microorganisms and so on.
Therefore, any product designed to treat reclaimed water must tolerate this variability and contain high concentrations of organic substances and active organisms, so water purifier polyacrylamide should be used. The scientific definition of sewage treatment: in order to make the sewage meet the water quality requirements of drainage or reuse, and purify the process.
Anionic polyacrylamide is used to accelerate the settling of solid suspended solids in the initial settling tank stage for municipal sewage treatment. When the secondary clarifier is treated, the mud compression performance of anionic polyacrylamide is not as good as that of cationic polyacrylamide. Cationic polyacrylamide is generally used in the later stage of biochemical sludge treatment process. After adding cationic polyacrylamide, the sludge enters the filter press for filtering, thus forming mud cake.
Application of Polyacrylamide in municipal sewage treatment: Municipal sewage treatment here generally refers to municipal sewage treatment plants, River sewage treatment, large-scale institutions sewage treatment plants, etc., municipal sewage treatment plants COD, SS is more difficult to deal with. Sewage treatment process includes primary settling tank, sand settling tank, secondary settling tank, biochemical tank (good maintenance, anaerobic tank), sludge concentration tank, sludge dewatering filter press, etc.