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2 038 345

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C1

(51)

IPC

(21) (22)

Application

4941908/26, 1991-06-03

(22)

Actual filing date

1991-06-03

(45)

Published

1995-06-27

(72)

Inventor

Petrov V.G.Makhnev E.S.Semakin V.P.

(73)

Holder

Institut Prikladnoj Mekhaniki Ural'Skogo Otdelenija Ran

METHOD FOR PRODUCTION OF ORGANIC-MINERAL FERTILIZER Russian patent published in 1995 - IPC

Abstract RU 2038345 C1

FIELD: agriculture. SUBSTANCE: method involves mixing the sewage sediment with a sulfuric acid solution, concentration 0.52-0.86 mole/cu dm at 40-70 C for 10-20 min. The resulting mixture is filtered on a drum-type vacuum filter. The residual acidity of the sediment is neutralized with alkaline agents. EFFECT: higher quality of fertilizer obtained by extraction of heavy metals from sewage sediment, and prevention of pollution of ambient medium. 1 tbl

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RU 2 038 345 C1

Authors

Petrov V.G.

Makhnev E.S.

Semakin V.P.

Dates

1995-06-27—Published

1991-06-03—Filed

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