Chitosan in Municipal Sewage treatment

Chitosan in Municipal Sewage treatment

Municipal domestic #sewage mainly consists of residential #wastewater and effluents from commercial and public‑service buildings. It contains abundant suspended colloids, organic matter, total phosphorus, grease and other pollutants. Conventional treatment largely adopts inorganic and synthetic polymeric flocculants such as #PAC and #PAM, which bring pain points including large sludge output, chemical residue and high costs for #sludge disposal.

Derived from shrimp and crab shells, chitosan is a natural cationic biopolymer. It can be applied as a #coagulant‑aid or primary #flocculant in the #pretreatment and advanced‑treatment sections of municipal #wastewater, complying with the green and low‑carbon development trend of the water‑treatment industry. Nevertheless, chitosan is not a universal product. Its processing performance is directly determined by specification parameters. Improper selection may lead to poor #flocculation effect, water re‑turbidity and excessive cost. Combined with the working conditions of municipal domestic sewage, this paper sorts out practical application logic and key points for product specification selection.

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