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2 109 696

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IPC

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Application

96113570/25, 1996-07-05

(22)

Actual filing date

1996-07-05

(45)

Published

1998-04-27

(72)

Inventor

Ehl'Kind K.M.Torunova M.N.Tishkov K.N.Dubrovin A.M.Loginov N.V.

(73)

Holder

Nizhegorodskij Gosudarstvennyj Tekhnicheskij Universitet

METHOD FOR UTILIZING SEWAGE PRECIPITATES OF PLANTS FOR BIOLOGICAL PURIFICATION Russian patent published in 1998 - IPC

Abstract RU 2109696 C1

FIELD: utilization of precipitates of sewage being prepared by municipal aeration plants. SUBSTANCE: precipitate is treated by acid washing solution. Then precipitate is neutralized by ammonia. Waste acid solution is affected in turn by electrochemical and chemical regeneration to extract heavy metals, thus treated solution is secondary used for treatment of sewage precipitate. 5-15 % solution of sulfuric acid is used as acid washing solution, precipitate is neutralized by 5-25 % aqueous ammonia solution. EFFECT: improved efficiency of the method. 4 cl, 4 tbl, 1 dwg

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RU 2 109 696 C1

Authors

Ehl'Kind K.M.

Torunova M.N.

Tishkov K.N.

Dubrovin A.M.

Loginov N.V.

Dates

1998-04-27—Published

1996-07-05—Filed

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