Patent ID: 7850849
Filing Date: 2010-12-14
Classification: B01D,C02F,C12M,Y02E

Abstract:
1. An apparatus for biological anaerobic treatment of wastewater, comprising a vertically elongated reaction vessel ( 1 ), a wastewater inlet system for reactor liquor ( 5 ) and influent ( 2 ) mixing and subsequent downward injection through one or more inlets or nozzles into one or more draft tubes located under the water level and mounted off the bottom of said reaction vessel ( 1 ), a reactor liquor recycling system comprising one or more outlets or nozzles for the suction of said reactor liquor ( 5 ) located in the bottom section of said reactor vessel ( 1 ), a means ( 7 ) for recycling said reactor liquor ( 5 ) from the bottom section to said wastewater inlet system, a means ( 4 ) for separating solids from purified water ( 3 ) situated in said bottom section of said reaction vessel, a treated wastewater outlet system comprising one or more outlets or nozzles ( 10 ) located after the said means ( 4 ) for separating solids for the removal of treated water ( 3 ) out of said reaction vessel ( 1 ), one or more spraying nozzles situated in the top of the reactor for spraying said treated water ( 3 ) onto the floating sludge as to counteract foaming, and a biogas collection system located in the top of the reactor ( 1 ) above the spraying nozzles comprising one or more outlets.