Liquid purification or separation – Processes – Treatment by living organism
Patent
1979-10-01
1981-08-18
Wyse, Thomas G.
Liquid purification or separation
Processes
Treatment by living organism
210612, 210617, C02F 328
Patent
active
042845084
ABSTRACT:
A method for purifying wastewater of biodegradable organics by converting the organics to methane and carbon dioxide gases is disclosed, characterized by the use of an anaerobic attached film expanded bed reactor for the reaction process. Dilute organic waste material is initially seeded with a heterogeneous anaerobic bacteria population including a methane-producing bacteria. The seeded organic waste material is introduced into the bottom of the expanded bed reactor which includes a particulate support media coated with a polysaccharide film. A low-velocity upward flow of the organic waste material is established through the bed during which the attached bacterial film reacts with the organic material to produce methane and carbon dioxide gases, purified water, and a small amount of residual effluent material. The residual effluent material is filtered by the film as it flows upwardly through the reactor bed. In a preferred embodiment, partially treated effluent material is recycled from the top of the bed to the bottom of the bed for further treatment. The methane and carbon dioxide gases are then separated from the residual effluent material and purified water.
REFERENCES:
patent: 4032407 (1977-06-01), Scott et al.
patent: 4127447 (1978-11-01), Griffith et al.
patent: 4182675 (1980-01-01), Teris
Pitt et al., "The Tapered Fluidized Bioreactor, etc.", AICHE Symposium Series No. 181, vol. 74 (1978).
Holladay et al., "Biodegradation of Phenolic Waste Liquors, etc.", AICHE Symposium Series, vol. 74, No. 172, pp. 241-252 (1978).
Scott et al., "Use of a Tapered Fluidized Bed as a Continuous Bioreactor", Biotechnology & Bioengineering, vol. 18, pp. 1393-1403 (1976).
Hsu, "Characteristics of Tapered Fluidized Reactors, etc.", paper presented at symposium on Biotechnology, etc., Gatlinburg, Tenn., May 10-12, 1978.
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