Municipal sewage is the general name of domestic sewage, industrial wastewater and runoff sewage in the urban area. It is usually collected and discharged into water bodies by urban pipelines or drained into water bodies after treatment by urban sewage treatment plants.
General urban sewage treatment methods can be divided into three types according to principles: physical treatment method, biological treatment method and chemical treatment method.
The use of polyacrylamide in municipal sewage is generally a biochemical sludge treatment process in the latter stage. After adding polyacrylamide, the sludge enters the filter press for pressure filtration, thereby forming a mud cake.
Municipal sludge treatment uses a belt filter press for dewatering, which can dewater the sludge to a moisture content of 80% -85%; with a plate and frame filter press or a box filter press, it can be dehydrated to a moisture content of 75% -83%; With a membrane filter press, it can be dehydrated to a moisture content of 70% -78%；
Nine Dragons Paper, the full name of Nine Dragons Paper (Holdings) Co., Ltd., is China's largest manufacturer of cardboard base paper products, as well as one of the world's largest waste paper environmentally friendly modern paper packaging group and one of the producers of cardboard base paper products. . It mainly produces cardboard, high-strength corrugated core paper, etc.
Capitel Environmental Protection Co., Ltd. cooperated with the Dongguan base of the Nine Dragons Group in 2009 to supply the polyacrylamide anions and cations required by the three major sewage treatment plants of the Dongguan base. Due to its high cost performance, it was further extended to the entire Nine Dragon Group, including Jiangsu Taicang, Chongqing, Tianjin, Leshan, and foreign bases in Vietnam.