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US 5,281,341 AGranted
Sludge treatment process
AssigneeThe Administrators of the Tulane Educational Fund
InventorsRobert S. Reimers, Maurice D. Little
Life of this patent
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Abstract
A method of treating a liquid waste or process stream that includes a sludge component and that enhances sludge treatment or stabilization. The sludge is acidified to a pH of less than 4.0 in an oxygen enriched environment. A nitrous acid level is maintained sufficiently high to kill pathogens, in a closed chamber so that the nitrous acid won't be lost from the chamber through volatilization.
Claims14
A method of treating liquid waste or process streams that include a sludge component, and that enhances sludge treatment or stabilization, comprising the steps of:
- a) preliminarily acidifying the sludge to be treated to a pH of about 3.0 in an oxygen enriched environment;
- and
- b) ozonating the sludge to raise the oxydation reduction potential of the sludge;
- c) placing the waste stream in a closed chamber;
- d) maintaining a nitrous acid level of 400 mg/l in the waste stream being treated for a sufficient time to kill pathogens.
2 more elements
Dependencies are inferred from the claim text.