| http://www.w3.org/ns/prov#value | - U.S. Pat. No. 2,809,118 teaches admixing sewage sludges with water glass (sodium silicate), a hydratizing chemical such as sodium carbonate, ammonium carbonate, sodium bicarbonate, ammonium phosphate, and the like, and a clay material to form substantially solid plastic materials suitable for compacting into constructional materials.
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