Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
2007-05-07
2008-12-02
Barry, Chester T (Department: 1797)
Liquid purification or separation
Processes
Treatment by living organism
C210S629000, C210S741000, C210S797000
Reexamination Certificate
active
07459083
ABSTRACT:
A membrane bioreactor system includes one or more biological reactors and one or more membrane tanks with each membrane tank having one or more membrane filters. To control membrane fouling, various process control variables are employed. First, the membrane filters are cleaned by an air scouring process where bubbles are moved upwardly adjacent the membrane filters and clean the same in the process. To control membrane fouling, a process is utilized that dynamically varies the air scouring flow rate (V) as a function of transmembrane pressure (TMP). In addition, the process entails allowing permeation to start and stop which results in a series of cycles where each cycle includes a permeation phase and a relaxation phase. The duration of the relaxation phase (TR) and the duration of the permeation phase (TP) is varied from cycle to cycle as a function of one or more process variables including the change in TMP over a selected period within a membrane phase, or the change in TMP over a selected time period spanning at least two membrane phases.
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DiMassimo Richard W.
Hong Sun-Nan
Zhao Hong W.
Barry Chester T
Coats & Bennett P.L.L.C.
I. Kruger Inc.
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