Control of anaerobic filter

Details Control of anaerobic filter Control of anaerobic filter

G - Physics

05

D

362/3, 341/38

G05D 7/06 (2006.01) B05B 12/00 (2006.01) C02F 3/00 (2006.01) C02F 3/28 (2006.01) F04B 49/06 (2006.01) G05B 13/02 (2006.01)

Patent

CA 1167137

ABSTRACT OF THE DISCLOSURE The operation of an anaerobic mathanogenic filter is controlled by measuring the rates at which oxygen demand (O.D.) is fed to the anaerobic filter and at which methane is generated by the filter, estimating there- from the O.D. of the effluent of the anaerobic filter and controlling the feed rate to the anaerobic filter in accordance with that estimated value. Also disclosed is a means for eliminating long term bias that may be pre- sent in the signals fed from sensors to the circuit used for estimating the value of a variable of a process. One aspect of this invention relates to the control of an anaerobic methanogenic reactor containing a retained backmixed bed of methanogenic bacteria through which aqueous organic waste water is fed upwardly, and in particular to the control of a recycling anaerobic filter. Another aspect relates to an improvement in the reli- ability of process control systems in general.

389748

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