Defoamer for PAC Efficiency in Textile Wastewater

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.