Poly ferric sulfate (PFS),polydimethyldiallylammonium chloride(PDMAAC) and effective micro organism (EM) were used singly and combinedly to treat the water in soft shell turtle ponds.

Jar tests were used to study the influences of the composite ratios of polyaluminum chloride(PAC) to polydimethyldiallylammonium chloride(PDM) and the intrinsic viscocity of PDM on the turbidity removal and precipitating performance,and the turbidity removal effect under the condition of prechlorination technique was compared with that without prechlorination.

A series of stable composite coagulants was prepared using polyaluminum chloride(PAC) and polydimethyldiallylammonium chloride(PDM) with different intrinsic viscosity as raw materials.

PREPARATION AND APPLICATION OF PDMDAAC-BF SLAG;

Dimethyldiallylammonium chloride(DMDAAC) was prepared by two-steps reaction and then polymerized it to get PDMDAAC.

Fly ash was modified by macromolecular flocculant PDMDAAC to improve its perfor-mance for pollutants removal,and the optimal parameters for the modification were investigated through orthogonal test.

A kind of composites of inorganic coagulants and organic polymer poly(dimethyldiallylammonium chloride)(PDM) was used for enhanced coagulation.

Flocculation mechanism of the cationic polyelectrolyte-polydiallyldimethylammonium chloride (PDADMAC);

Enhanced flocculation of natural dissolve humus by polydiallyldimethylammonium chloride(PDADMAC) was studied and removal mechanism was discussed.