EFFECT OF SALT CONCENTRATION ON SOY SAUCE WASTEWATER TREATMENT USING THE SNAP MODEL

This study applies the SNAP model (Single-stage Nitrogen removal using Anammox and Partial nitritation) to remove organic compounds, especially N-NH4, from wastewater. Experiments were conducted using real wastewater taken from the anaerobic treatment tank of the Mekong Sauce Processing Company’s wastewater treatment system. The study was carried out across four phases with corresponding salt concentrations of 0.29%, 0.59%, 0.89%, and 1.18%. The results showed that at pH 7.24 ± 0.08 and a hydraulic retention time of 24 hours, the N-NH4 removal efficiency peaked at 92.8% when the NaCl concentration was 0.59%. At the same salt concentration, the COD and P-PO4 removal efficiencies were 42.4% and 56.5%, respectively. Additionally, the microbial density reached 1.5×10⁸ CFU/mL at the end of phase 2.