PAC-PAM复合絮凝剂处理燃煤电厂脱硫废水的研究

Study on PAC-PAM compound flocculant for treatment of desulfurization wastewater from coal-fired power plants

考察了现阶段燃煤电厂脱硫废水常用水处理药剂聚合氯化铝(PAC)与聚丙烯酰胺(PAM)联合用于预处理脱硫废水时,药剂的离子形态、絮凝剂选择、药剂投加量、反应转速、溶液pH对絮凝效果的影响及其影响机理。絮凝试验结果表明,非离子形态PAM在低投加量情况下的絮凝效果优于C-PAM和A-PAM;相较于PAFC、PAFS、PFS等絮凝剂,PAC的絮凝效果较好,且其与PAM质量比为10:1、pH=8、转速为250 r/min条件下,除浊率达99.3%,此时上清液浊度为30.2 NTU,SS值为58 mg/L,可满足脱硫废水水质指标中对SS的出水要求。

The impacts of the ion morphology of flocculant,flocculant selection,the dosage of flocculant,reaction rotation speed and solution pH on the flocculation effect are investigated,and the impacting mechanism is explored when polyaluminum chloride(PAC)and polyacrylamide(PAM)are jointly used to pretreat the desulphurization wastewater from coal-fired power plants.The flocculation test results show that the flocculation effect by non-ionic form PAM is better than that by C-PAM and A-PAM under the condition of low dosage.Compared with PAFC,PAFS,PFS and other flocculants,PAC has better flocculation effect.The removal rate of turbidity reaches 99.3%when the mass ratio of PAC to PAM is 10∶1,pH=8,and the rotating speed is 250 r·min^(-1).Meanwhile,the turbidity of supernatant is 30.2 NTU and the SS value is 58 mg·L^(-1),which can meet the requirement on SS in effluent for the quality index of desulfurization wastewater.