Sand Oil Grease (SOG) separators

Sand Oil Grease Separators are below ground tanks  designed  to  capture  dirt,  sand,  sludge, minor petroleum spills, etc. from vehicle maintenance facilities to keep these substances out of the wastewater system. The separator treats these wastes by allowing substances lighter than water (such as oil) to float and substances heavier than water (such as sand) to sink.

If the sand/oil separators are not pumped frequently enough, the heavier dirt, sand, sludge and/or the lighter oil and grease will occupy too much space in the tank and be siphoned through the outlet pipe to the wastewater system. If the separator is not maintained property wastes can also cause a blockage and/or odor problem.

The sand oil and grease trap is mandatory in mechanical workshops where oil and grease are washed down from equipment. The oil and grease is separated out before disposing into municipal waste water streams.

How does it work?

Sand Oil Grease separators / traps use two or three chambers, to separate oily petrochemicals and solid wastes (dirt, sands, and solids) from water. The waste water from a wash bay is collected in the primary separation chamber, and the oily petrochemicals rise to the top, while solids sink to the bottom. A crossover pipe is fixed in the middle of the chamber wall, below the oily petrochemical film and above the solid grit. Cleaned water flows through the crossover pipe to the second chamber, where gravity separates any remaining grit and oils from the water. This water flows out of the second / third chamber through an outlet pipe to the sewer system.

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What does it look like?

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