Method of improving membrane bioreactor performance

Liquid purification or separation – Processes – Treatment by living organism

Reexamination Certificate

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C210S732000

Reexamination Certificate

active

07378023

ABSTRACT:
Cationic polymers having a molecular weight greater than about 200,000 can be added to the activated sludge in an MBR for industrial wastewater treatment for reasons, which include: conditioning the activated sludge; improving flux through a membrane in the MBR; reducing fouling of the of the membrane in the MBR; and reducing foaming of the activated sludge in the MBR.

REFERENCES:
patent: 6723245 (2004-04-01), Collins et al.
patent: 6872312 (2005-03-01), Shah et al.
patent: 2005/0029174 (2005-02-01), Collins
Calvo et al., Abstract of “Behaviour of a nitrifying and denitrifying submerged filters in the treatment of urban wastewater,” Current Studies of Biotechnology, 2001, vol. 2, pp. 175-181.
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Nagaoka et al., “Influence of bacterial extracellular polymers on the membrane separation activated sludge process,” Water Science and Technology, 1996, vol. 34, No. 9, pp. 165-172.
Nagaoka et al., “Modeling of biofouling by extracellular polymers in a membrane separation activated sludge system,”Water Science and Technology, 1998, vol. 38, Nos. 4-5, pp. 497-504.
Yoon et al., “A novel flux enhancing method for membrane bioreactor (MBR) process using polymer,” Proceedings of the International Conference On Membrane (ICOM), 2005b, Aug. 21-25, Seoul, Korea.
Yoon et al., “Effects of flux enhancing polymer on the characteristics of sludge in membrane bioreactor process,” Water Science and Technology, 2005a, vol. 51, Nos. 6-7, pp. 151-157.

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