Side stream type membrane bioreactor process

Details Side stream type membrane bioreactor process Side stream type membrane bioreactor process

2011-01-25

2011-01-25

Barry, Chester T (Department: 1797)

Liquid purification or separation

Processes

Treatment by living organism

C210S623000, C210S624000, C210S625000, C210S626000, C210S627000, C210S760000, C210S798000

Reexamination Certificate

active

07875179

ABSTRACT:
The invention provides a side stream type membrane bioreactor process which does not cause an excessive fall in the MLSS concentration in a bioreactor, does not require any additional effluent treatment facility for discharging backwash effluent, and can further ensure the stability of the membrane filtration performance of a separation membrane. According to the invention, in a side stream type membrane bioreactor process, a backwash effluent containing foulants that are generated by backwashing a separation membrane is collected in a backwash effluent tank, and subjected to ozone treatment, and the resultant is returned to a bioreactor. By this ozone treatment, the foulants close to the membrane pore size of the separation membrane are made fine or are made into a state be easily taken into activated sludge flocs. Therefore, even when the treated effluent is returned to the bioreactor, the membrane filtration performance of the separation membrane is not deteriorated.

REFERENCES:
patent: 5851399 (1998-12-01), Leitzke
patent: 2006/0213833 (2006-09-01), Kando et al.
patent: 2000-218294 (2000-08-01), None
patent: 2001-070761 (2001-03-01), None
patent: 2001-300576 (2001-10-01), None
patent: 2003-033764 (2003-02-01), None
patent: 2004-249235 (2004-09-01), None
patent: 2006-297376 (2006-11-01), None

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