Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1980-12-24
1982-07-20
Wyse, Thomas G.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210712, 210797, C02F 152
Patent
active
043404871
ABSTRACT:
A process is provided for removing suspended solids from a waste water stream exiting from a wet rendering plant, a centrifugal rendering plant and/or a hide curing brine system before the stream enters a public sewer system. Such waste water typically has some oils, fats and/or protein particles in addition to easily settled solids previously removed therefrom. The waste water is delivered to a holding tank wherefrom the waste water is drawn and pH adjusted with sodium carbonate, sodium hydroxide, or the like. Air is injected into the pH adjusted waste water along with flocculating agent such as ferric sulfate. Thereafter, the waste water is injected at a relatively low velocity into a flotation tank wherein flocculated wet solids urged upwardly by the injected air are allowed to float to the top of the tank and water which is relatively low in suspended solids and biological oxygen demand is removed from the lower portion of the tank and is pH adjusted and sent to a sewer. The wet solids are allowed to overflow the top of the flotation tank onto a dual continuous belt filter or the like. In the filter liquids contained within the wet solids are removed therefrom forming a relatively liquid free solids cake. The cake is scraped from the filter and collected. Water from the holding tank without substantial flocculated solids therein is used to selectively wash the filter so as to remove solids not removed with the cake which would otherwise tend to plug same. The wash water with the solids washed from the filter therein is then returned to the holding tank for additional processing.
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