Liquid purification or separation – Processes – Treatment by living organism
Patent
1998-08-14
2000-03-14
Upton, Christopher
Liquid purification or separation
Processes
Treatment by living organism
210614, 210620, 210612, C02F 312
Patent
active
060368624
ABSTRACT:
The present invention provides a process and apparatus for autothermal aerobic thermophilic treatment of high strength and high temperature wastes. In accordance with the process of the present invention, waste material is injected into a reactor vessel having thermophilic microorganisms to form a volume of bulk liquid in the reactor vessel. An oxygen-containing gas is also injected into the reactor vessel in such manner as to transfer oxygen into the reactor bulk liquid for utilization by the thermophilic microorganisms in aerobic treatment of the waste material. The oxidation-reduction potential and temperature of the reactor bulk liquid are monitored and at least a selected one of the rate of injection of the oxygen-containing gas, the oxygen-transfer efficiency of the oxygen-containing gas and the volume of bulk liquid in the reactor are adjusted in response to the oxidation-reduction potential and temperature of the reactor bulk liquid to maintain the temperature of the reactor bulk liquid within a predetermined range. This allows the system to match the oxygen transfer to the oxygen demand for the system. In particularly preferred embodiments, other parameters such as pH, COD, TS, VS, VFAs, NH.sub.3 --N, PO.sub.4 --P, alkalinity and sulfides in the reactor bulk liquid, as well as O.sub.2, CO.sub.2, and H.sub.2 S in the offgas are monitored to provide further process information for optimization of the aerobic, thermophilic treatment process. Biological kinetic relationships developed by the inventor, and specific formulations of biological growth micronutrients are utilized for further enhancing the aerobic thermophilic treatment process.
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Free, Jr. Phillip L.
McCarty Bill D.
Upton Christopher
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