Liquid purification or separation – Processes – Treatment by living organism
Patent
1995-11-08
1997-05-06
McCarthy, Neil
Liquid purification or separation
Processes
Treatment by living organism
210620, 210626, 210628, 210630, 210 961, 210143, 210151, 2101951, 210205, 210209, 210220, 210903, C02F 330, C02F 320
Patent
active
056267550
ABSTRACT:
Methods and apparatus for treating waste streams utilize controlled introduction of microscopic gaseous bubbles to create, in a single vessel, as many as three separate biological environments in discrete, stratified zones. In preferred embodiments, bubbles of air are introduced at the bottom of the vessel, creating an aerobic zone in this vicinity. Depletion of oxygen by microorganisms resident in this layer creates an anoxic zone that drifts upward, establishing itself above the aerobic layer. The two layers remain segregated due to the intolerance of aerobic microorganisms for the overlying anoxic environment, the sharpness of the interface depending on the degree of intolerance. Preferably, the treatment vessel is used in conjunction with a clarifier in an internal recycle configuration; clear water from the top of the clarifier is conducted away from the system as treated effluent, while a portion of the biomass settling at the bottom of the clarifier is returned to the head of the treatment vessel through a hydrocyclone and screen arrangement to remove inert content, thereby substantially increasing the efficiency of biological waste-digestion processes.
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Holcombe Don M.
Keyser Gene E.
Green Theodore M.
McCarthy Neil
Micronair, Inc.
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