A textile factory faced persistent foam in aeration tanks after PAC dosing, increasing SV30 to 40% and reducing settling efficiency. Analysis identified PAC-surfactant reactions and high organic load as primary causes.
Chemi Tech’s Approach:
High-temperature resistant defoamer KM-406 (0.8‰ of inflow) with sludge age reduction from 14 to 7 days.
Process integration:
Co-dosing defoamer with PAC at injection points;
Maintaining pH at 6.5–7.5 for optimal PAC performance.
Outcomes:
COD removal increased by 18% with defoamer residues below 0.1 ppm, proving suitability for high-organic wastewater.