Method and Process for Municipal Sewage Treatment Using Pam Polyacrylamide

Pam polyacrylamide flocculant for municipal sewage. With the rapid development of the tertiary industry, the discharge of municipal sewage is increasing day by day. If municipal sewage is not purified and treated, direct discharge can cause significant environmental pollution. Pam polyacrylamide, known as the "helper for various industries," plays a crucial role in municipal sewage treatment.

Municipal sewage is the general term for domestic sewage, industrial wastewater, and runoff wastewater in urban areas. It is usually collected and discharged into water bodies through urban channels or discharged into water bodies after being treated by municipal sewage treatment plants. The COD and SS in municipal sewage are relatively high, making it difficult to treat. As the treated water in municipal sewage treatment undergoes significant changes and is difficult to treat, and the raw sewage contains high concentrations of organic matter, microorganisms, and other pollutants, with frequent concentration changes, any product used to treat sewage must be able to tolerate this variability and high concentrations of organic matter and active organisms. This brings us to "PAM", polyacrylamide, known as the "helper" in municipal sewage treatment.

Introduction of pam polyacrylamide

Pam polyacrylamide, abbreviated as PAM, is a water-soluble high molecular polymer that is insoluble in most organic solvents. It has good coagulation properties and can reduce frictional resistance between liquids. It can be divided into four types based on its ion characteristics: non-ionic, anionic, cationic, and amphoteric.

Municipal sewage treatment methods

Municipal sewage treatment methods can generally be categorized into three types: physical treatment, biological treatment, and chemical treatment. Pam polyacrylamide is generally used in the later stage of the biogas sludge treatment process, where the sludge is treated in a filter press after adding pam polyacrylamide, resulting in the formation of sludge cakes.

Municipal sewage treatment process

• Pretreatment: This includes grids, sewage lifting pumps, aerated sand settling tanks, and primary settling tanks. After treatment, the sewage flows into the aerated biofilter tank by relying on the natural water level difference.

  
  

• Multi-stage aerated biofilter tanks: The wastewater quality that comes into contact with the various levels and different levels of biological carriers in the biofilter tanks varies, forming different microbial communities in each level that are suitable for the treated wastewater quality of that level.

  
  

• Post-treatment: High-efficiency air flotation replaces traditional secondary sedimentation tanks, and the sludge is directly discharged into the sludge storage tank. After treatment, the sludge is sent to a belt filter press or a decanter centrifuge for dewatering, resulting in the formation of sludge cakes, which are then transported or used as organic fertilizer.

Anionic pam polyacrylamide and polyaluminum chloride are used in the primary or secondary sedimentation tank stage to accelerate the coagulation and sedimentation of suspended solids. The sludge dewatering process in the post-treatment stage generally uses cationic pam polyacrylamide to treat sludge. The specific selection of the type of pam polyacrylamide used in municipal sewage treatment depends on the water quality of the sewage at the site and the type of sludge dewatering equipment used. Generally, experimental selection and on-site testing are conducted to determine the appropriate type and dosage of pam polyacrylamide.