1. The coagulant in sewage treatment mainly refers to polyaluminium chloride (PAC): it is a high-efficiency inorganic polymer coagulant, which is produced by the bridging effect of hydroxide ions and the polymerization of multivalent anions. Compared with traditional coagulants, PAC has the remarkable characteristics of fast floc formation, fast sedimentation
1. The flocculant in sewage treatment often refers to polyacrylamide (PAM), which is a water-soluble high molecular polymer, insoluble in most organic solvents, has good flocculation, and can reduce the friction resistance between liquids. 2. PAM can be divided into three types: anionic polyacrylamide, cationic polyacrylamide, and nonionic polyacrylamide. 2.1.1
Commonly used chemicals for sewage treatment mainly include five categories: acid-base regulators, flocculants/coagulants, redox agents, functional agents (such as phosphorus removal agents, ammonia nitrogen removal agents, etc.) and auxiliary agents. Through physical and chemical reactions, pollutants are removed and water quality is discharged or reused in compliance with standards. 1.