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Liquid Purification

Method-for-increasing-the-rate-of-anaerobic-bioremediation-in-a-bioreactor

Process for treatment of water and of surfaces in contact with the said water in order to prevent the attachment of and/or to remove and/or to control macroorganisms, composition and paint for the said treatment

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Method for increasing the rate of anaerobic bioremediation in a bioreactor

Details

Inventors: Day, Donal F.; White, Elton W.;
Assignee:
Primary Examiner: Cintins; Ivars
Assistant Examiner:
Attorney, Agent or Firm: Kiesel; William David, Tucker; Robert C.

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.

DETAILED DESCRIPTION Therefore, one object of this invention is to provide improved processes for rapidly increasing the rate of remediation of bioreactors by the continuous addition of large quantities of the most pollution-specific and acclimated anaerobic microorganisms available to the bioreactor.
Another object of this invention is to provide improved processes and apparatus for continuous rapid selection (isolation) of the most pollutant-degrading and environment acclimated populations of anaerobic microorganisms available to the bioreactor.
Another object of this invention is to provide improved processes and apparatus for the continuous, rapid and automatic re-selection of the most pollutant-degrading and environment acclimated populations of anaerobic microorganisms whenever a more efficient organism becomes available in the bioreactor, either through the evolutionary process (adaption), from changing environmental conditions that favor one microbe over another or from ex-situ introduction of organisms into the bioreactor.
Another object of this invention is to provide improved processes and apparatus for continuously and rapidly increasing populations of the selected pollutant-degrading and environment acclimated microorganisms.
Another object of this invention is to provide improved processes and apparatus for continuously and rapidly adding the increased populations of the selected pollutant-degrading and environment acclimated microorganisms to a bioreactor.
Still another object of this invention is to provide improved processes and apparatus to protect a bioreactor from upsets.
Still another object of this invention is to provide improved processes and apparatus to provide rapid recovery of a bioreactor from upset conditions.
A further object of this invention is to provide an anaerobic incubator apparatus that is structured to accommodate various sized and shaped pollution water streams.
Another object of this invention is to provide processes and apparatus that do not require the addition of ex-situ grown microorganisms to the bioreactor

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