Trihydrate vs Anhydrous Sodium Acetate: Which to Choose for WWTPs?

Sodium acetate commonly comes as trihydrate (CH3COONa·3H2O, content ≥58%) and anhydrous (CH3COONa, content ≥99%).

Wastewater denitrification mostly uses liquid trihydrate sodium acetate solution, convenient to dose and lower cost; anhydrous sodium acetate is easy for long-distance transport and powder dosing, suitable for sites lacking liquid source or needing on-site preparation. Product requirements can refer to HG/T 5959-2021.

WWTPs should choose based on dosing method, storage/transport conditions and cost; liquid carbon source is more suitable for continuous automated dosing.