聚二甲基二烯丙基氯化銨是一種以二甲基二烯丙基氯化銨為主體的陽離子型有機(jī)高分子聚合物，具有良好的水溶性，水溶液呈中性，在水溶液中電離后產(chǎn)生帶正電荷的季銨鹽類線型作用基團(tuán)。它除了具有一般高分子絮凝劑的架橋、卷掃功能外，還具有相當(dāng)強(qiáng)的電中和能力。其絮凝機(jī)理是高分子陽離子基團(tuán)與帶負(fù)電荷的污泥離子相吸引，降低及中和了膠體離子的表面電和，同時(shí)壓縮了膠體擴(kuò)散層而使微粒凝聚脫穩(wěn)；同時(shí)，借助高分子鏈的粘連架橋作用產(chǎn)生絮凝沉降。經(jīng)電中和，使膠體脫穩(wěn)，并將表面附著水轉(zhuǎn)化成自由水，提高污泥脫水性能。結(jié)論綜上，在實(shí)驗(yàn)的幾種調(diào)理方式中，陽離子PAM調(diào)理的污泥雖然CST 和SRT降低，但是泥餅含水率降至77%以后難以進(jìn)一步降低，不能滿足深脫含水率要求。鐵鹽+石灰和聚二甲基二烯丙基氯化銨在達(dá)到一定的藥劑投加量后，能使泥餅含水率至深脫要求。Polydimethyldiallylammonium chloride is a cationic organic polymer with dimethyldiallylammonium chloride as the main body. It has good water solubility, and the aqueous solution is neutral. After ionization, a positively charged quaternary ammonium salt linear action group is produced. In addition to the bridging and roll sweeping functions of general polymer flocculants, it also has quite strong electrical neutralization capabilities. The flocculation mechanism is that polymer cationic groups attract negatively charged sludge ions, which reduces and neutralizes the surface charge of colloidal ions, and at the same time compresses the colloidal diffusion layer to make particles agglomerate and destabilize; at the same time, with the help of polymer The adhesion and bridging of the chain produces flocculation and settlement. After electric neutralization, the colloid is destabilized and the surface attached water is converted into free water, which improves the sludge dewatering performance. Conclusion In summary, in the several conditioning methods in the experiment, although the CST and SRT of the sludge conditioned by cationic PAM are reduced, it is difficult to further reduce the water content of the sludge cake after it drops to 77%, which cannot meet the requirements of deep dehydration. After iron salt+lime and polydimethyldiallylammonium chloride reach a certain dosage of medicament, the moisture content of the mud cake can reach the requirement of deep removal.