A "milky" water usually means that you have an emulsion forming. Emulsions are insolubles such as grease, oils, or fats suspended in the water. Surfactants with non-polar and polar ends attach to the oils and water creating micelles. Each micelle in the milky water case contains oil attached to the non-polar end of the surfactant. The polar end of the surfactant keeps the non-polar oils suspended or dispersed in the water phase. It is the dispersed oils in this case that cause the milky appearance - interestingly milk is a suspension of fats and proteins in water hence the appearance.
Foaming in this case is caused by the surfactants and is usually stable and light in color. Anti-foams tend to work well on surfactant foams.
And remember that removing grease in the WWTP is important because:
Erik Rumbaugh has been involved in biological waste treatment for over 20 years. He has worked with industrial and municipal wastewater facilities to ensure optimal performance of their treatment systems. He is a founder of Aster Bio (www.asterbio.com) specializing in biological waste treatment.
Click to set custom HTML