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US 6,406,510 B1Granted
Methods for treating wastewater sludge
AssigneeUnified Environmental Services Group, LLC
InventorJeffrey C. Burnham
Life of this patent
Estimating the term…
Abstract
This invention relates to methods for treating wastewater sludge cake with acid and calcium carbonate under acidic, low heat conditions to produce a stable, soil-like or granular, finished product containing calcium carbonate, useful as a nitrogen fertilizer, synthetic soil component or soil conditioner for pH control.
Claims19
A method for treating wastewater sludge to produce a stabilized product comprising the steps of:
- mixing said wastewater sludge comprising greater than 10% solids with an acid to form an acid-sludge mixture;
- mixing the acid-sludge mixture with an amount of a material containing calcium carbonate, wherein said amount is such that the pH of the mixture is less than about 8.0;
- and
- drying the mixture to produce the stabilized product.
1 more element
A method for treating wastewater sludge to produce a stabilized product comprising the steps of:
- mixing said wastewater with an amount of a material containing calcium carbonate, wherein said amount is such that the pH of the mixture is less than about 8.0;
- mixing the calcium carbonate-containing wastewater mixture with an acid to form an acid-sludge mixture;
- and
- drying the acid-containing mixture to produce the stabilized product.
1 more element
Dependencies are inferred from the claim text.