| 摘要 |
PROBLEM TO BE SOLVED: To enhance the efficiency of dehydration of raw sewage sludge produced by membrane separation and denitrification by using a mixture of a prescribed polymer contg. a water-soluble cationic vinyl monomer represented by a specified formula with a hydrophilic surfactant. SOLUTION: Monomers including a water-soluble cationic vinyl monomer represented by the formula or its mixture are subjected to reverse phase emulsion polymn. in the presence of a chain transfer agent and the resultant polymer is mixed with a hydrophilic surfactant to obtain the objective dehydrating agent forming particles each having <=30μm particle diameter when it is diluted with water to a concn. fit for addition to sludge and forming a continuous dry film when the prepd. diluted soln. is applied to glass plate and dried at 105 deg.C. In the formula, A is O or NH, B is C2 H4 , C3 H6 or C3 H5 OH, R1 is H or CH3 , each of R2 and R3 is a 1-4C alkyl, R4 is H, a 1-4C alkyl or benzyl and X<-> is an anionic counter ion.
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