Patent ID: 6468429
Filing Date: 2002-10-22
Classification: C02F,Y02W

Abstract:
An aerobic bioreactor having an upper circulating zone and a lower plug flow zone, said bioreactor having elongate upflow and downflow chambers in said circulating zone which are in fluid communication at their upper and lower ends; an influent conduit for discharging biodegradable waste into said upflow chamber; an effluent conduit for extracting effluent from said plug flow zone in a lower portion of said bioreactor; and a gas inlet for injecting oxygen-containing gas into said bioreactor to drive the circulation of a liquor comprising said biodegradable waste between said upflow and downflow chambers wherein said bioreactor comprises a flow control device mounted in said upflow chamber upstream from a discharge end of said influent conduit for adjustably regulating the circulation velocity of said liquor.