Control of anaerobic filter

Details Control of anaerobic filter Control of anaerobic filter

1980-11-24

1982-09-14

Adee, John

Liquid purification or separation

Constituent mixture variation responsive

210104, 210110, 210120, 210218, 324 71R, C02C 102

Patent

active

043494358

ABSTRACT:
The operation of an anaerobic methanogenic 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 therefrom 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 present in the signals fed from sensors to the circuit used for estimating the value of a variable of a process.

REFERENCES:
patent: 3823728 (1974-07-01), Borris
patent: 4053352 (1977-10-01), Hultman
patent: 4098274 (1978-07-01), Ebling et al.
patent: 4229266 (1980-10-01), Wheaton
Athans, "The Compensated Kalman Filter", Proceeding of Nonlinear Estimation Theory Conference, pp. 10-22, IEEE, Sep. 1971.
Graef and Andrews, "Stability and Control of Anaerobic Digestion", Journal WPCF, vol. 46, No. 4, Apr. 1974, pp. 666-683.
Lettinga, "Direct Anaerobic Treatment Handles Wastes Efficiently", Industrial Wastes, Jan./Feb., 1979, pp. 18-24, 40, 41.
Athans, "The Role and Use of the Stochastic Linear-Quadratic-Gaussian Problem in Control System Design", IEEE Transactions on Automatic Control , vol. AC-16, No. 6, Dec. 1971, pp. 529, 552.

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