chitosan in wastewater tertiary treatment

Chitosan in WastewaterTertiary Treatment

High‑molecular‑weight native chitosan is an acid soluble, unmodified biopolymer that cannot dissolve directly in clean water. It has achieved mature full‑scale application in tertiary polishing at European municipal wastewater treatment plants. Dosed after the secondary sedimentation tank, it acts as a bio‑based coagulant aid together with low dosages of ferric salt or #PAC.

For municipal tertiary treatment, native chitosan with a deacetylation degree ≥85% is recommended. Its long polymer chains deliver strong bridging capacity to produce dense, shear‑resistant flocs, while avoiding excessively high solution viscosity that may block dosing pumps.

The typical full‑scale dosing range for secondary effluent is 8‑20 mg/L based on raw wastewater, used as a co‑agent with inorganic coagulants. Adding this chitosan can cut ferric salt or PAC consumption by 30‑50%. Over‑dosing must be avoided, as excess chitosan causes charge reversal and deteriorates clarification performance. Jar tests on‑site are mandatory before commissioning to determine the optimal dosage according to actual water quality.

Dissolution procedure: The powder shall be prepared into dilute solution with 1‑2% v/v acetic acid under continuous stirring for 1‑2 hours prior to dosing. Long polymer chains capture fine suspended solids, colloids, colour, residual phosphorus and microplastics, forming large and stable #flocs that settle rapidly in clarification tanks.

This process has operated stably for years in many medium‑sized European municipal plants. It reduces metal residues in final effluent and limits metal accumulation in sludge, making it suitable for subsequent land reuse and well‑received by wastewater operators.

To further reduce costs, it can be combined with other low‑cost #naturalpolymers from Yudacentury. Please contact us for further details.

#watertreatment #sewage treatment #industrialchitosan #textile #dyeing  #flocculant #flocculation #coagulantaid  #coagulant

 Yudacentury As a supplier of chitosan application solutions with 24years experience.

Our main products: chitin, #chitosan, #Hydroxypropyl Chitosan, #HydrochlorideChitosan, Chitosan Lactate, #CarboxymethylChitosan. #deacetylation

#highviscosity chitosan

With origin: Chitosan Fresh North Atlantic Shrimp Shell/Crab Shell Origin

Chitosan #Aspergillus Niger Origin 

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