CTS/PAM/PAC絮凝剂处理造纸废水的应用研究

Application Study on the Treatment of Paper-making Wastewater Using Chitosan / Polyacrylamide / Polyaluminium Chloride Flocculants

为了改善传统絮凝剂聚合氯化铝/聚丙烯酰胺(PAC/PAM)的絮凝效果,本课题研究了壳聚糖/聚合氯化铝/聚丙烯酰胺(CTS/PAM/PAC)复合絮凝剂的制备方法,考察了絮凝剂用量、p H值、搅拌速率和搅拌时间等因素对造纸废水CODcr和浊度去除效果的影响。结果表明:当复合絮凝剂中CTS、PAM和PAC用量分别为12 mg/L、60 mg/L和200 mg/L时,在p H值为7.2、搅拌速率和搅拌时间分别为80 r/min和8 min条件下,絮凝效果最好,CODcr与浊度的去除率分别为53.9%和98.6%。与PAC/PAM混合絮凝剂相比,CODcr与浊度的去除率分别提高了13.2%和5.9%,药剂成本下降了21.1%,因此,CTS/PAM/PAC絮凝剂具有明显的环境效益与经济效益。

In order to improve the coagulating performance of traditional polyaluminium choride /polyacrylamide flocculant（ PAC / PAM）, the preparation of chitosan / polyacrylamide / polyaluminium choride（ CTS / PAM / PAC） composite flocculants was studied and the effect of flocculants dosage,p H,mixing rate and mixing time on removal efficiency of CODcrand turbidity were also investigated. It was found that coagulating performance is the highest when the component and dosage of composite flocculants were 12 mg / L of CTS,60 mg / L of PAM and 200 mg / L of PAC under the condition of p H = 7. 2,mixing rate of 80 r / min and mixing time of 8 min,respectively. The removal efficiencies of CODcrand turbidity reached 53. 9% and 98. 6% by using composite flocculants. The removal efficiencies of CODcrand SS were respectively increased by 13. 2% and 5. 9%,and the cost of the composite flocculants was decreased by 21. 1%,compared with the conventional flocculants PAC / PAM. Therefore,CTS / PAM /PAC flocculants had obvious economic and environmental benefits.