The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 24, 1985
Filed:
Jan. 27, 1983
Joseph J Heijnen, The Hague, NL;
Gist-Brocades N.V., Delft, NL;
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.