Aerated immersed membrane system

Details Aerated immersed membrane system Aerated immersed membrane system

B - Operations, Transporting

01

D

B01D 65/02 (2006.01) B01D 61/18 (2006.01) B01D 63/02 (2006.01) B01D 63/04 (2006.01) B01D 65/08 (2006.01) C02F 1/44 (2006.01) C02F 1/74 (2006.01)

Patent

CA 2307492

An element of immersed, suction driven, filtering membranes has a plurality of hollow fibre membranes suspended between upper and lower headers. The lower header is movable between a first position in which the fibres are substantially elongated and second position in which the two headers are closer to each other by between 1 and 4% of the un-potted length of the membranes. The weight of the lower header is sufficient to keep the lower header in the first position in substantially quiescent water while allowing the lower header to rise to the second position in upwardly flowing water. Aerators are mounted generally below the elements and supply scouring bubbles to each element at a higher rate and then at a rate less than one half of the higher rate in repeated cycles. The cycles are preferably between 10 seconds and 60 seconds in duration. The lower header rises to the second position when bubbles are supplied at the higher rate and falls to the first position when bubbles are supplied at the lower rate.

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