Method of waste water treatment by flocculating sedimentation

Details Method of waste water treatment by flocculating sedimentation Method of waste water treatment by flocculating sedimentation

1997-08-14

1999-01-19

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210631, 210727, 210730, 210734, C02F 156

Patent

active

058611002

ABSTRACT:
The method of the invention is characterized by adding comprises adding an inorganic flocculant to waste water treated with activated sludge process, adjusting the waste water between pH 4.0 and 5.0, waste water in this state for at least 1 minute, adjusting the waste water between pH 5.5 and 9.0 and adding an anionic polymer flocculant to generate flocs and separating the flocs to obtain supernatant. According to the invention, flocs become large, especially since flocs grow by adsorbing fine particles during maturation. The clarity of the treated water is sharply improved, and the qualities of the treated water, such as COD and chromaticity are also improved. Moreover, the scale of sedimentation tank can be made compact due to the improvement in precipitatability of flocs by growing into large size.

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patent: 5160621 (1992-11-01), Nagasaki et al.
patent: 5433853 (1995-07-01), Mamone
patent: 5573670 (1996-11-01), Nagasaki et al.

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