Method for producing biological fertilizers from sewage
OwnerRudolf Postrihacinventor
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Abstract
A biological fertilizer is prepared by a process which comprises treating sewage sedimentation sludge with sulphite waste liquor, the treatment being carried out at a pH of no more than 6, followed by mixing the mixture of treated sludge and waste liquor with pulverized vegetable matter, whereby to form a biological fertilizer.
Claims21
A process for preparing a biological fertilizer which comprises treating sewage sedimentation sludge with sulphite waste liquor, at a pH of no more than 6, at a temperature of up to about 25.degree. C, under oxidizing conditions to form a reaction product, and mixing the reaction product with pulverized vegetable matter to form a biological fertilizer.
A process for the preparation of a biological fertilizer, which process comprises treating sewage sedimentation sludge with from 5 to 30% by volume of green liquor resulting from paper or cellulose production, the green liquor containing from 5 to 10% by weight of an alumina product selected from the group consisting of red mud and bauxite containing a low proportion of alumina, the treatment being carried out at a pH of from 5 to 6, and at a temperature of up to 25.degree. C, followed by mixing the mixture of treated sludge and green liquor with pulverized vegetable matter, said vegetable matter being selected from the group consisting of shredded peat, peat litter, chopped straw and grass cuttings, to form a biological fertilizer, and then storing said biological fertilizer for at least about 1 month after production.
Dependencies are inferred from the claim text.