Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
2007-08-28
2010-06-15
Prince, Fred (Department: 1797)
Liquid purification or separation
Processes
Treatment by living organism
C210S617000, C210S603000, C210S150000, C210S259000, C210S903000, C210S906000
Reexamination Certificate
active
07736513
ABSTRACT:
Biological nutrient removal (BNR) in wastewater treatment to remove carbonaceous substrates, nutrients and phosphorus, has recently become increasingly popular worldwide due to increasingly stringent regulations. Biological fluidized bed (BFB) technology, which could be potentially used for BNR processes, can provide some advantages such as high efficiency and compact structure. This present invention incorporates the fixed-film biological fluidized bed technology with the biological nutrient removal in a twin liquid-solid fluidized bed, which has achieved the simultaneous elimination of organic carbon, nitrogen and phosphorus, in a very efficient manner and with very compact space requirements. The BNR-LSFB has two fluidized beds, running as anoxic/anaerobic and aerobic processes to accomplish simultaneous nitrification and denitrification and to remove carbonaceous substrates, nutrients and phosphorus, with continuous liquid and solids recirculation through the anoxic/anaerobic bed and the aerobic bed. The new BNR-LSFB system is not only an excellent alternative for conventional activated sludge type BNR technologies but is also capable of processing much higher loadings and suitable for industrial applications.
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Cui Yubo
Nakhla George
Zhu Jingxu
Hill & Schumacher
Prince Fred
Schumacher Lynn C.
The University of Western Ontario
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