Biological denitrification needs carbon. When your influent lacks enough biodegradable COD to drive the nitrate-reduction step, the plant cannot meet its total-nitrogen limit no matter how well the biology runs otherwise. That is when operators dose an external carbon source — and sodium acetate has become the default choice for municipal and industrial WWTPs across Southeast Asia.
Three families of external carbon sources are in common use: methanol, glucose (and sugar-based products), and sodium acetate. They differ in how fast the denitrifying biomass can consume them, how safely they can be stored and handled, and what they cost per kilogram of nitrate removed.
| Carbon source | Denitrification speed | Handling & safety | Typical positioning |
|---|---|---|---|
| Sodium acetate | Fast — directly usable by denitrifiers, minimal adaptation | Non-flammable crystalline solid, easy dosing from a simple dissolve tank | Standard choice for plants chasing a tight TN limit |
| Methanol | Fast after acclimation | Flammable, toxic, strict storage regulations | Declining in popularity due to safety cost |
| Glucose / sugars | Slower — needs hydrolysis first | Safe but viscous solutions, summer spoilage risk | Budget option where TN limits are loose |
The pattern we see in Vietnam and Indonesia: plants that once used methanol or glucose switch to sodium acetate when their discharge standard tightens or when safety compliance costs bite. The chemical itself is not the cheapest per ton — but it is usually the cheapest per kilogram of nitrogen removed, because less of it is lost to side processes and the biomass responds within hours, not weeks.
Our industrial-grade sodium acetate (purity 58-60%, HG/T 2031) is supplied at a reference US $280–400 per metric ton FOB China port. The final quote depends on order quantity and market — full-container orders sit at the lower end of the band. MOQ is 1 ton for trial orders, and we ship with COA per batch. For comparison shopping: divide any quoted price by the purity and by the denitrification performance your jar test shows — a cheaper ton that delivers less usable carbon is not cheaper.
The dosing amount follows from simple stoichiometry plus your safety factor. The logic: every mg/L of nitrate-nitrogen to be removed needs a calculable mg/L of acetate-carbon, multiplied by an engineering safety factor that your jar test confirms for your own biomass. In practice, plants dosing for a few mg/L of nitrate-N typically consume on the order of hundreds of kilograms of sodium acetate per day at medium scale — which is why a stable supply and a predictable price band matter more than a one-off low quote. We will help you work the numbers from your influent TN, effluent TN target and flow; bring us the three figures and we return a consumption and cost estimate with the quote.
Related product: Sodium Acetate (Carbon Source for Denitrification, 58-60%) · More guides: PAC vs PAM selection · PAC dosage calculation