碱式氯化铝与聚丙烯酰胺的协同作用

Synergistic Effect Between PAC and PAM in Wastewater Treatment

通过絮凝试验表明，碱式氯化铝与聚丙烯酰胺复配使用会产生协同作用。聚丙烯酰胺分子通过桥连作用，可使碱式氯化铝生成的絮体变大，絮体结构更为紧凑、牢固，含水量减少，加快絮体与水的分离速度，从而提高水处理效果。这种协同作用与加药顺序有很大关系。若先加碱式氯化铝，后加聚丙烯酸胺，则可发生明显的协同作用。反之，则无协同作用。污水的ｐＨ值也会影响这种协同作用，ｐＨ７～８时的效果最佳。用炼油厂的污水进行试验得到了同样的结果。

It is demonstrated that a synergistic effect will occur if PAC and PAM are used together in flocculation. By building bridge among the flocculates formed by PAC, the PAM molecules can make them bigger, and their structure denser and solider. The water they containe will be less. They can seperate from water faster. Therefore, the treatment efficiency can be improved. The synergistic effect can be affected greatly by the sequence of adding the two agents. If adding PAC firstly, and then PAM, the effect will be strong.Otherwise, it will be nothing. Also, it can be affected by the pH of wastewater. Its optimum pH is 7～8. Also, the effect occurs in the flocculating ex penment using refinery wastewater.