FOG is usually associated with restaurant or cooking waste although cosmetics, bath oils, suntan lotion and other personal care products increase oil in residential effluent. FOG increases BOD and it doesn’t break down easily in the system. Any concentration above 20 mg/L can hinder onsite systems without additional pretreatment.
A few years ago I was involved in a class where we visited several houses that had various media filters as a part of their wastewater treatment systems. When we opened the media filter at one location we found the surface of the filter was clogged as well as the orifices in the...
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