Liquid purification or separation – Processes – Treatment by living organism
Patent
1996-09-19
1998-04-28
Wyse, Thomas G.
Liquid purification or separation
Processes
Treatment by living organism
210605, 210622, 210630, C02F 330, C02F 332
Patent
active
057440417
ABSTRACT:
A method for the step-wise reduction of biological oxygen demand of a waste material having a high concentration of organic waste is provided. The method comprises the steps of providing waste material having a biological oxygen demand and allowing the waste material to separate into a liquid fraction comprising water and suspended organic waste, and allowing at least a portion of the organic waste to be anaerobically digested by microorganisms naturally occurring in the organic waste. Next, at least a portion of the liquid fraction having a reduced biological oxygen demand in relation to the biological oxygen demand of the waste material is removed and mixed with aerobic microorganisms and an aerating gas and allowing at least a portion of the organic waste in the aerobic mixture to be aerobically digested by the aerobic microorganisms to form a liquor comprising water and suspended solids. The liquor has a reduced biological oxygen demand relative to the biological oxygen demand of the liquid fraction. Then, at least a portion of the suspended solids in the liquor is allowed to settle, forming a clarified liquor having a reduced biological oxygen demand relative to the biological oxygen demand of the liquor. The clarified liquor is subjected to microzone treatment to remove at least a portion of the aerobic microorganisms from the clarified liquor to form a permeate having a reduced biological oxygen demand relative to the clarified liquid. Finally, at least a portion of the permeate is discharged or reused.
REFERENCES:
patent: 3711392 (1973-01-01), Metzger
patent: 4053394 (1977-10-01), Fisk
patent: 4251359 (1981-02-01), Colwell et al.
patent: 4267038 (1981-05-01), Thompson
patent: 4995980 (1991-02-01), Jaubert
patent: 5645725 (1997-07-01), Kong et al.
Tracy Emery L.
Wyse Thomas G.
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