Demulsifiers

 General Properties: Nonionic surfactants with specific HLB values, polyethers, or cationic polymers; typically clear to slightly hazy liquids with extremely high interfacial activity.

 Synergistic Role in Defoamers: Oily wastewater generates highly stable "oily foam" during pumping, agitation, and the demulsification process itself. While the demulsifier breaks the liquid-phase emulsion to coalesce oil droplets, the defoamer breaks the gas-liquid interface of the foam lamella. Together, they prevent the newly freed oil from being re-stabilized by the foam.

 Performance Benefits:

Accelerates Oil-Water Separation: Rapidly disrupts the emulsion interface film, prompting micro-oil droplets to coalesce and float to the surface.

Prevents Oil-Stabilized Foam: Synergizes with defoamers to eliminate stubborn foam stabilized by free or emulsified oil, preventing foam from carrying oil into the effluent and causing high COD levels.