METHOD FOR DEHYDRATION OF SEDIMENT Russian patent published in 2006 - IPC C02F11/14 C02F1/56 B01D21/01 

FIELD: chemical technology.

SUBSTANCE: invention relates to methods for separating heterogeneous media, namely, wetted sediments to isolate dehydrated sediment as the end product. Method for treatment of sediment involves addition to a sediment two flocculants and conversion of treated sediment on press and the following preparing a solid phase wherein cationic and non-ionogenic flocculants before their addition to a sediment are mixed in the amount (by mass) from 3:1 to 1:1, and the total amount of mixture is from 3.0 to 7.2 kg per 1000 kg of the sediment solid phase. As a cationic flocculant method involves using a copolymer of acrylamide with a monomer comprising quaternary nitrogen atom, and polymer based on acrylic acid amide is used as a non-ionogenic flocculant. Preferably, mixing flocculant solutions is carried out 20 min before their addition to sediment, not early. For mixing flocculant solutions with their concentrations 0.03-0.20 wt.-% are used. Separation of a solid phase is carried out in chamber filter-press. Method provides effective dehydration of sediments of different composite and origin in simultaneous increase of the equipment output. Invention can be used in coal mining, coal chemical, mining, food processing and chemical industries and in treatment of sewage waters.

EFFECT: improved method for dehydration.

5 cl, 5 ex