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Tank#1 has a working capacity of 1,000 gallons. It is always completely full <br /> of water and both floating and sedimentary material, as well. This tank is fed <br /> by the submersible 4gpm sump pump. Floating oils and greases, together with <br /> sediment and water that escaped entrapment in the troughs, has a 500 minute <br /> retention time within this tank to achieve a good passive phase separatin. The <br /> majority of the oil and grease will collect at the top of this tank. The sediment <br /> will fall out of the watery mix and will collect at the bottom of this tank. This <br /> tank will be fit with a hi-level electric warning device which will be both visual <br /> and audible. There will also be a mechanical level indicator in this tank. <br /> Periodically, the oily phase will be drawn off by vacuum truck for recycling. <br /> The sediment will also be removed using a vacuum truck taking care not to <br /> remove more water than necessary, to remove the sludge. The quantity of <br /> both phases will be periodically gauged using techniques developed within the <br /> fats and oils industry. When the quantity is sufficient, the phase will be drawn <br /> off. <br /> Tank#2 has a working capacity of 1,OOOgallons. It is always completely full <br /> and it's height, like that of tank#1, is regulated by adjustment of interior <br /> reverse siphon tube which also acts as a weir to prevent carry-over of the <br /> _ phases into itself. Although the retention time on the floor, in the trough and <br /> in tank#1, is sufficient, to achieve good and passive phase separation, Tank#2 <br /> acts as a tertiary phase separation component. Between Tank#1 and #2, the <br /> used wash water will have over a 1,000 minutes of retention time during <br /> operation. <br /> The floor-trough system, Tank#1 and Tank#2 ,operate passively or semi <br /> automatically. Monitoring each of these components is visual and periodic. <br /> The relatively clean water collected within the center portion of tank#2 passes <br />` automatically by siphon into Tank#3, the flocculation tank. This water is <br /> contaminated with suspended solids, as well as dissolved solids. The <br /> suspended solids are collected using a suitable cold water polymer, being <br /> continuously mixed using a standard electric top mounted propeller-type <br /> agitator. Once the dirty water and the polymer are thoroughly mixed, a <br /> flocculant, such as fly ash or Portland cement is added to weight the <br />