Liquid purification or separation – Processes – Treatment by living organism
Patent
1983-01-27
1985-12-24
Castel, Benoit
Liquid purification or separation
Processes
Treatment by living organism
210617, 210150, 210903, 435167, 435170, 435174, 435801, C02F 306, C02F 328, C12P 502
Patent
active
045604797
ABSTRACT:
In a process for the production and maintenance of well-adhering biomass attached to carrier particles capable of decomposing contaminants in waste water containing both well-adhering and non-adhering microorganisms wherein a granular carrier is contacted in a reaction space with a continuous stream of waste water containing both well-adhering and non-adhering microorganisms and nutrients for the growth and the maintenance of the microorganisms in an adherent layer until a sufficiently thick, well-adhering layer of microorganisms is formed and maintained on the carrier, the improvement comprising maintaining the residence time of the waste water in the reaction space lower than the reciprocal maximum growth rate of the microorganisms on carrier particles of at least 0.1 mm while generating in the reaction liquid shear forces caused by liquid motion and circulation caused by gas bubbles and washing out of the reaction space all non-adhering microorganisms.
The process can be used for the production of high amounts per cubic meter of reactor volume of all kinds of biomass attached to a carrier, e.g. biomasses as are applied in the biological purification of waste water, aerobic biomass, anaerobic biomass, nitrifying biomass and denitrifying biomass, as well as biomasses forming a desired metabolic product which inhibits its own production rate at higher concentrations, e.g. biomass for the production of alcohol.
REFERENCES:
patent: 3846289 (1974-11-01), Jeris et al.
patent: 4009099 (1977-02-01), Jeris
patent: 4225430 (1980-09-01), Bosman
patent: 4255266 (1981-03-01), Moreaud et al.
patent: 4284508 (1981-08-01), Jewell
patent: 4419243 (1983-12-01), Atkinson et al.
Atkinson, et al.; "The Completely Mixed Microbial Film Fermenter"; Trans. Inst. Chem. Engrs., vol. 50, 1972 (pp. 208-216).
Jack et al., "The Immobilization of Whole Cells"; Advances in Biochem. Eng., vol. 5, 1977 (pp. 126-127).
Castel Benoit
Gist-Brocades N.V.
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