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An oil/grease separator separates a lighter liquid from a mixture of the heavier liquid and a lighter liquid. A housing has an inner volume, an inlet to receive influent flow, an outlet to discharge the heavier liquid, which defines a static liquid level, and an outlet port above the static liquid l

An oil/grease separator separates a lighter liquid from a mixture of the heavier liquid and a lighter liquid. A housing has an inner volume, an inlet to receive influent flow, an outlet to discharge the heavier liquid, which defines a static liquid level, and an outlet port above the static liquid level to discharge substantially all of the lighter liquid and portions of the heavier liquid. The lighter liquid floats on the heavier liquid, so that large volume flows into the inlet raises the liquid level in the housing, flowing the floating lighter liquid through the outlet port.

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What is claimed is: 1. A method of removal of grease and oil from effluent water comprising: installing an oil/grease separator assembly at facility site; connecting an inlet of the oil/grease separator to a kitchen sink with waste materials to be removed and separated; connecting an outlet of the

What is claimed is: 1. A method of removal of grease and oil from effluent water comprising: installing an oil/grease separator assembly at facility site; connecting an inlet of the oil/grease separator to a kitchen sink with waste materials to be removed and separated; connecting an outlet of the oil/grease separator to a sewage system; operating the oil/grease separator to separate and remove oil/grease from the effluent water by receiving effluent flow and permitting oil/grease to float to the top of a water component of the effluent and flowing oil/grease floating on water over a discharge outlet to an external storage tank during periods of high flow from the source of discharging effluent to an oil/grease storage tank and permitting water to flow downstream on a separate path below the discharge outlet to a second outlet connected to a drain; and returning water to a housing along a path from a low portion of the oil/grease storage tank as the fluid level subsides. 2. A method of removal of grease and oil from effluent water comprising: permitting oil/grease of the effluent to float to the top of water of the effluent in a housing at times between large flows; receiving intermittent flows of effluent containing water and oil/grease from a kitchen sink into the housing so as to raise the liquid level in the housing; when the liquid level in the housing has raised to a threshold, flowing oil/grease floating on water over a discharge outlet to an external oil/grease storage tank and permitting water to flow downstream on a separate path below the discharge outlet to a second outlet connected to a drain; continuing to discharge effluent from the housing after the intermittent large flow so that the liquid level subsides; and as the fluid level subsides, returning water from a low portion of the oil/grease storage tank to the housing. 3. The method of removal of grease and oil from effluent water as claimed in claim 2, wherein the intermittent large flows are received downwardly into the housing. 4. The method of removal of grease and oil from effluent water as claimed in claim 2, wherein the second outlet defines a static fluid level in the housing and during periods of large flow, the fluid level rises so the oil/grease flows over the discharge outlet at a height that is higher than the static fluid level. 5. The method of removal of grease and oil from effluent water as claimed in claim 4, further comprising focusing the oil/grease within the housing so it is near the discharge outlet. 6. The method of removal of grease and oil from effluent water as claimed in claim 2, wherein the discharge outlet discharges oil/grease to an oil/grease storage tank that surrounds the housing. 7. A method of removal of grease and oil from effluent water comprising: receiving intermittent large flows of effluent containing water and oil/grease downwardly from a kitchen sink into a housing having a static liquid level and other, smaller flows between the intermittent large flows; permitting oil/grease of the effluent to float to the top of water of the effluent at times between large flows; raising the liquid level above the static liquid level so oil/grease floating on water flows over a discharge outlet at a height that is higher than the static liquid level to an oil/grease storage tank that surrounds the housing, accompanied by water, and permitting grey water to flow downstream on a separate path below the discharge outlet to a second outlet connected to a drain, and as the liquid level subsides, returning water from a low portion of the oil/grease storage tank to the housing, wherein during periods of flow smaller than a large flow, grey water flows downstream on the separate path to the second outlet without raising the liquid level to the height of the discharge outlet. 8. A method of removal of grease and oil from effluent water comprising: receiving intermittent large flows of effluent containing water and oil/grease and solids from a kitchen sink into a housing; holding the solids of the effluent in an upstream portion of the housing; permitting oil/grease of the effluent to float to the top of water of the effluent at times between large flows; flowing oil/grease floating on water over a discharge outlet during periods of large flow from the source of discharging effluent to an external oil/grease storage tank and permitting water to flow downstream on a separate path below the discharge outlet to a second outlet connected to a drain; periodically transferring the solids from the upstream portion to the drain with a solid waste transporter; and returning water from a low portion of the oil/grease storage tank to the housing as the fluid level subsides. 9. A method as claimed in claim 8 wherein the transferring of solids is by eduction. 10. A method as claimed in claim 9 wherein eduction is by a jet of water from a water supply. 11. A method as claimed in claim 10 wherein the water supply is derived from the effluent being separated. 12. A method as claimed in claim 8 wherein the transferring of solids is by a macerating pump.