Biological sludge-energy recycling method

Details Biological sludge-energy recycling method Biological sludge-energy recycling method

1979-06-27

1981-05-12

Castel, Benoit

Liquid purification or separation

Processes

Treatment by living organism

210609, 210613, 210631, 210632, 210912, C02F 334

Patent

active

042670497

ABSTRACT:
A method is described for converting treated sludge into an improved concentrated organic feedstock. The method includes conditioning of sludge with hydrolytic enzymes, the mechanical disintegration of tissue and cell components, the removal of heavy metals, autolysis and dewatering to produce an organic fertilizer or feedstock. Product stabilization for long-term storage is achieved by acidification or addition of granular sorbents. Agricultural fertilizers are produced from input raw material such as sludge from municipal waste-water treatment facilities or sludge from biological processing of other organic wastes. Animal feed protein concentrates are produced from cultured cellular biomass sludge inputs. The separated heavy metals fraction may be refined to recover individual minerals. Energy usually expended for disposal of sludge as wastes may be applied to recycling such sludge into useful products of this invention. The commercial equivalents of these products usually are manufactured from petrochemical and other primary energy resources.

REFERENCES:
patent: 3801499 (1974-04-01), Luck
patent: 3994780 (1976-11-01), Klass et al.
patent: 4041182 (1977-08-01), Erickson et al.
patent: 4083783 (1978-04-01), Wing et al.
patent: 4159944 (1979-07-01), Erickson et al.

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