Solution for Foam Control in Poly-Aluminum Chloride Aqueous

In industrial cooling systems, poly-aluminum chloride (PAC) often triggers foam due to microbial growth or chemical interactions. A chemical plant observed 90% foam coverage in oxidation ditches during low-temperature seasons, with SVI rising to 350 mL/g, causing operational disruptions.

Root Cause Analysis:

Seasonal microbial proliferation: Microthrix bacteria increased surface tension.

Chemical incompatibility: Residual dispersants reacted with PAC, stabilizing foam.

Solution with Chemi Tech Defoamer KM-406:

Emergency defoaming: Sprayed at 50–200 mg/L, rupturing foam within 30 minutes.

Long-term control: Daily dosing at 0.5‰ to disrupt biofilm.

Results:

Foam reduced by 95% in 3 hours, SVI decreased to 120 mL/g.

No foam recurrence over 7 days, demonstrating stability in high-salinity environments.