Liquid purification or separation – Processes – Treatment by living organism
Patent
1991-11-19
1992-09-29
Silverman, Stanley S.
Liquid purification or separation
Processes
Treatment by living organism
210625, 210629, 210151, 2101952, 2101953, 210205, 210258, C02F 144, C02F 312
Patent
active
051511878
ABSTRACT:
In a system for biodegrading oxidizable organic waste in a bioreactor in combination with a membrane ultrafiltration unit used to separate a high quality permeate from activated sludge which is returned to the bioreactor from the membrane unit as a recycle stream, it has been found that an in-line fine bubble diffuser or "micronizer" takes advantage of the kinetic energy in the recycle stream to aerate the biomass with surprising efficiency. The micronizer is positioned external to the biomass in the bioreactor; the discharge from the micronizer provides a microaerated tail-jet of the recycle stream which has been infused with a mass of air bubbles from 1-1000 .mu.m in diameter. The velocity of the compressed air flowed into the micronizer keeps its pores from clogging with sludge. The energy of the recycle stream without the air is insufficient to provide the requisite motive force for adequate oxygen transfer and to establish a predetermined recirculation pattern.
REFERENCES:
patent: 3269542 (1966-08-01), Renzi et al.
patent: 3773659 (1973-11-01), Carlson et al.
patent: 4861471 (1989-08-01), Nakao et al.
Lobo Alfred D.
Silverman Stanley S.
Upton Christopher
Zenon Environmental Inc.
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