Liquid purification or separation – Processes – Treatment by living organism
Patent
1989-12-22
1992-04-21
Dawson, Robert A.
Liquid purification or separation
Processes
Treatment by living organism
210 85, 210 961, 210143, 2101951, 210620, 210739, C02F 300
Patent
active
051065118
ABSTRACT:
This invention describes a biological inhibition/toxicity detector, which provides an early warning of a process upset due to possible inhibition/toxicity problems in biological reactors treating municipal and/or industrial wastewaters. The detector basically comprises separate means for providing two liquids in communication with a mixing tank, a spiral plug-flow reactor, two dissolved oxygen (DO) probes, a DO analyzer, a computer, and a chart recorder. Two pumps can continuously pump portions of wastewater to be tested and acclimated active biomass (mixed liquor) from a biological reactor into the mixing tank. The wastewater and biomass are mixed and oxygenated in the tank, and then continuously fed to the plug-flow reactor. The DO concentrations at the front and back ends of the plug-flow reactor are measured separately by the two DO probes. These probes send corresponding signals through a DO analyzer to a computer, which calculates the oxygen uptake rate (OUR) or the specific oxygen uptake rate (SOUR) of the biomass mixture in the plug-flow reactor based on some user input information. A chart recorder prints out the measured DO concentrations and the calculated OUR or SOUR values. By monitoring the OUR or SOUR values continuously and accompanying them with "normal" values, the device described in this invention provides an advance warning of a potential process upset in biological reactors treating municipal and/or industrial wastewaters.
REFERENCES:
patent: 4009099 (1977-02-01), Jeris
patent: 4260490 (1981-04-01), Moss et al.
patent: 4314969 (1982-02-01), Arthur et al.
patent: 4329232 (1982-05-01), McKenna
patent: 4643830 (1987-02-01), Reid
patent: 4783750 (1988-11-01), Smith
Metcalf and Eddy, Wastewater Engineering: Treatment Disposal Reuse (1979), 2nd Edition, published by McGraw-Hill, N.Y., p. 479.
Dawson Robert A.
Kim Sun Uk
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