Patent ID: 6613222
Filing Date: 2003-09-02
Classification: C02F,Y02W

Abstract:
A device for the treatment of waste water comprising:one or more single-chamber bioreactors in parallel containing an activated sludge for exposing the waste water to a) an initial mix-fill phase having a predetermined duration in which the waste water is directed into the bioreactor, mixed with the activated sludge and the bioreactor environment is controlled to provide an initial anaerobic time for achieving phosphorous release and denitrification of oxidized nitrogen in the vessel, b) a react-fill phase having a predetermined duration in which the flow of waste water into the bioreactor continues and the waste water is exposed to alternating periods of aeration and mixing only to promote completely mixed aerobic and anoxic conditions and c) a react-discharge phase having a predetermined duration in which the flow of waste water into the bioreactor ceases and the waste water is exposed to alternating periods of aerobic and anoxic conditions; an external filtration unit including a membrane; one or more valves for controlling the flow of wastewater into the bioreactor to create a mixture; one or more pumps for controllably pumping waste water into the bioreactor one or more mixers for mixing the waste water with the activated sludge in the bioreactor; one or more blowers for controllably aerating the waste water and activated sludge in the bioreactor at designated intervals; one or more valves for controlling the flow of the mixture to the filtration unit; a pump for pumping the mixture through the filtration unit such that solids in the mixture are separated from liquid in the mixture; and one or more valves for controlling the return flow of the mixture from the filtration unit to the bioreactor.