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Disposal method and use of sewage sludge
| Details |
Inventors: Webster, William C.; Hilton, Robert G.; Cotts, Ronald F.;
Assignee: IU Conversion Systems, Inc. (Philadelphia, PA)
Primary Examiner: Douglas; Winston A.
Assistant Examiner: Sheehan; John P.
Attorney, Agent or Firm: Miller & Prestia
Digested sewage sludge resulting from sewage plant treatment of municipal sewage is disposed of and used in an ecologically acceptable manner by the incorporation of such sludge in hardenable compositions further including, for example, lime, fly ash and, in some cases, alkaline earth metal sulfates and/or soil or other inert or complimentary additives. These hardenable compositions may be emplaced in an area open to the atmosphere and permitted to cure over a period of time to act as land fill or as road base materials. |
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DETAILED DESCRIPTION We claim: 1.
A water-solids mixture hardenable under atmospheric conditions the dry solids of which comprise (based on weight % of dry solids): 1-15% lime 1-50% digested sewage sludge solids 20-90% fly ash, and the water of which provides a moisture content (based also on weight % dry solids) of 5- 50%.
2.
A water-solids mixture hardenable under atmospheric conditions, as recited in Claim 1, wherein said moisture content is 15-30% and said dry solids comprise: 2-6% lime 8-20% digested sewage sludge solids 30-80% fly ash.
3.
A water-solids mixture hardenable under atmospheric condition, as recited in claim 1, wherein said mixture further includes: 1-10% calcium sulfate anhydrite (based on weight % of solids).
4.
A water-solids mixture hardenable under atmospheric condition, as recited in claim 2, further including: 1.
5 - 3% calcium sulfate anhydrite (based on weight % solids).
5.
A water-solids mixture hardenable under atmospheric condition, as recited in claim 3, further including: 10-60% soil (based on weight % solids).
6.
A water-solids mixture hardenable under atmospheric condition, as recited in claim 4, further including: 20-45% soil (based on weight % solids).
7.
Method of treating a sludge from a municipal sewage plant comprising admixing said sludge with lime and fly ash such that the final composition of said admixture has a moisture content of 5- 50% and the dry solids therein comprise: 1-15% lime 1-50% digested sewage sludge solids 20-90% fly ash, and permitting said admixture to harden under atmospheric conditions.
8.
Method, as recited in claim 7, wherein an alkaline earth sulfate is also included in said admixture, the amount of said sulfate in said admixture to be the molar equivalent of 1- 10% (by weight solids) calcium sulfate anhydrite.
9.
Method, as recited in claim 8, wherein soil is also included in said admixture, said soil comprising 10-60% of said solids.
10.
Method, as recited in claim 7, wherein said moisture content is below 35% and said admixture is compacted after placement and before being permitted to harden
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Gutter-related 
