Liquid purification or separation – Processes – Treatment by living organism
Patent
1992-04-15
1995-05-09
Cintins, Ivars
Liquid purification or separation
Processes
Treatment by living organism
C02F 328
Patent
active
054137136
ABSTRACT:
A process is disclosed to increase the anaerobic bioremediation rate in a bioreactor by recirculating to the bioreactor that portion of a pollution stream that has flowed through a passageway containing material on whose surface anaerobic microorganisms can attach or become immobilized at a flow rate that would slough from the surface and return to the stream at least a portion of the microorganisms from the surface. A preferred flow rate would be one which, after the surface of the material has been substantially covered with immobilized microorganisms, sloughs from the surface and returns to the stream a portion of the immobilized microorganisms at a rate of at least 10.sup.5 cfu for each milliliter of the stream flowing through the passageway, more preferably 10.sup.6 -10.sup.8 cfu. Another preferred flow rate would be one in which the total BOD consumed in the passageway per unit of time is maximized. Still another preferred flow rate would be 0.1-12.0 times the volume of the passageway per hour.
In another embodiment a microorganism incubation apparatus for bioremediation of a liquid pollution stream is provided which comprises: a column having a passageway extending through the column, charged, porous material positioned in the passageway and having a surface about which microorganisms can become immobilized, means for retaining the material in the passageway and structured to allow the stream to pass through the passageway, and a pump sized to flow the stream through the passageway at a flow rate sufficient to slough from the surface and return to the stream at least a portion of any microorganisms attached or immobilized on the surface of the material.
REFERENCES:
patent: 4627917 (1986-12-01), Morper
Day Donal F.
White Elton W.
Cintins Ivars
Kiesel William David
Tucker Robert C.
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