Process for conditioning sewage sludge

Details Process for conditioning sewage sludge Process for conditioning sewage sludge

2006-07-10

2010-06-08

Savage, Matthew O (Department: 1797)

Liquid purification or separation

Processes

Chemical treatment

C210S749000, C071S012000, C071S061000, C071S064010

Reexamination Certificate

active

07731859

ABSTRACT:
A method of treating sewage sludge that has a solids concentration of about 18-35% by weight includes treating the sewage sludge with sodium hydroxide, potassium hydroxide, or a combination thereof to increase its pH to at least about 12, and treating the sewage sludge with calcium oxide. The treatment of the sewage sludge with the calcium oxide can take place before and/or during the treatment of the sludge with the sodium hydroxide, potassium hydroxide, or a combination thereof. The amount of calcium oxide used is about 0.05-0.8% by weight of the sewage sludge.

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