Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1995-04-18
1997-02-18
Wyse, Thomas G.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210751, 210764, C02F 1114
Patent
active
056038429
ABSTRACT:
A process is provided for the alkaline stabilization of substantially liquid sludge which includes the steps of providing sludge of low solids content to a basin, and providing alkaline additive in sufficient quantity to the sludge in the basin to increase the ph of the sludge to a level above 12 by utilizing a sludge/alkaline blending Y. The blending Y has a sludge arm conduit, an alkaline arm conduit, and an exit conduit. Alkaline additive is provided to the alkaline arm conduit and recirculated sludge/alkaline mixture is drawn from the basin and is provided to the sludge arm conduit. A sludge/alkaline mixture containing newly added alkaline additive exits through the exit conduit of the Y. The recirculated sludge/alkaline and alkaline additive are mixed and thoroughly intermingled as they pass through the Y. The contents of the basin are thoroughly mixed by mixers such that all particles of the sludge/alkaline mixture in the basin have a Ph level of at least approximately 12 and the pH of the sludge/alkaline mixture is maintained at this level for at least approximately 2 hours. Finally, the pH of the sludge alkaline mixture is maintained at a level above approximately 11.5 for at least approximately 22 hours. A substantial reduction of pathogens and vector attractiveness of the resulting mixture is realized. An apparatus for achieving the same is also provided.
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Lime, Handling, Application and Storage, Bulletin 213, Published by National Lime Association, Seventh Edition 1995.
Tuttle Randall S.
Whitaker Roy L.
Amsco Incorporated
Wyse Thomas G.
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