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US5116506: Support aerated biofilm reactor

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Filing Information

Inventor(s) Kenneth J. Williamson · Sandra Woods · Stuart E. Strand ·
Assignee(s) Oregon State University ·
Attorney/Agent(s) Klarquist, Sparkman, Campbell, Leigh & Whinston ·
Primary Examiner Thomas Wyse ·
Application Number US7655206
Filing date 02/11/1991
Issue date 05/26/1992
Predicted expiration date 06/30/2009
U.S. Classifications 210/610  · 210/615  ·
International Classifications C02F 330  ·
Kind CodeA
International Classifications 210615;610;611;605;620;629;630;150;151;908;909 ·
Related U.S. Application DataThis application is a continuation of application Ser. No. 07/375,269, filed on Jun. 30, 1989, now abandoned.
17 Claims, No Drawings


Abstract

A gas permeable membrane divides a reactor vessel into a liquid compartment and a gas compartment. A biofilm is grown on the gas permeable membrane on the liquid side of the membrane. Teh gas permeable membrane is supported by the structure of the membrane itself. The biofilm is chosen from bacteria to degrade cetain pollutants by means of anaerobic fermentation, aerobic heterotrophic oxidation, dehalogenation, and hydrocarbon oxidation. This is accomplished by means of oxygen and alternate gases (i.e., methane) through the gas permeable membrane to certain bacteria growing on the liquid side of the gas permeable membrane.

Independent Claims | See all claims (17)

  1. 1. A method of treating liquid waste, comprising the steps of:providing a reactor having a gas permeable membrane that divides the reactor into a liquid compartment for the liquid waste and a gas compartment for a gas;providing a biofilm layer on the liquid compartment side of the membrane, the layer comprising a first layer of aerobic organisms adjacent the membrane, and a second layer of anaerobic organisms between the aerobic layer and liquid;introducing an oxygen containing gas into the gas compartment, and allowing it to diffuse through the membrane; andintroducing a liquid waste into the liquid compartment and allowing it to react with the biofilm layer.
  2. 17.17. A reactor for treating liquid waste, comprisinga reactor having a gas permeable membrane that divides the reactor into a liquid compartment for the liquid waste and a gas compartment for a gas;a biofilm layer on the liquid compartment side of the membrane, the layer comprising a first layer of aerobic organisms adjacent the membrane, and a second layer of anaerobic organisms between the aerobic layer and liquid;a means for introducing an oxygen containing gas into the gas compartment, and means for allowing the gas to diffuse through the membrane without mixing the first and second layers; andmeans for introducing a liquid waste into the liquid compartment and allowing it to react with the biofilm layer.

References Cited

U.S. Patent Documents

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US4416993 McLeod & Miller (Engineers) Limited McKeown Nov 1983
US4746435 Mitsubishi Rayon Co., Ltd. Onishi et al. May 1988
US5057221 Weyerhaeuser Company Bryant et al. Oct 1991

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