Experimental Study on Application of
PAC Produced Electrochemically in Water and Wastewater
Treatment

QU Jiu-hui，LIU Hui-juan，LEI Peng-ju，TANG
Hong-xiao
(Res.Center of Eco-environ.Sci.,Chinese
Academy of Sci.,Beijing 100085,China)

　　 Abstract：A kind of high grade PAC with Alb
content of 67.6% and molar ratio of hydroxy to aluminum
of 64.5% was produced by electrolysis process and used
for treatment of water and wastewater in jar tests and
pilot-scale tests.The results show that this kind of PAC
is more effective in removal of SS,humics from water and
COD and oil from wastewater comparing with other PACs
and traditional coagulants.99.1% of SS and 57.6% of COD
can be removed from wastewater with the dosage of 10
mg/L PAC (as Al2O3),so it is obviously superior to other
coagulants.
　　Keywords:coagulant;electrolysis
process;PAC;water treatment

　　在现代絮凝剂的研究中，已从形态学方面证明聚合氯化铝(PAC)主要由3种形态构成［1～3］：Ala形态(主要包括铝的自由离子、单体、低聚物)、Alb形态(铝的聚合物)和Alc(三羟化铝溶液或凝胶)，并可分别求得各自的含量及比例：AlT＝Ala+Alb+Alc(1)一般认为Alb部分是最佳的凝聚絮凝形态，并证明Alb即为Al13的聚合形态(化学式为Al13O4(OH)7+24)［4］，它实际上是一定控制条件下铝离子的水解—聚合—沉淀过程的动力学中间产物。采用电化学方法制备絮凝剂主要是采用电解法制备碱式氯化铝和电渗析法制备一般概念上的聚合氯化铝。在前期的研究中［5～7］，一种以Alb为优势形态的聚合氯化铝采用电解法制备成功，它具有高碱化度、高Alb形态等特点，具备高效净水最佳絮凝的化学形态条件。

1　E—PAC的制备

　　连续进料、出料的电解制备反应系统见图1。
　　电解液采用三氯化铝溶液，阳极为金属铝，电流为600
A，电压为1.4 V，E—PAC为无色透明液体，产量为100
kg/d，W(Al2O3)＝10%，W(Alb)＝67.6%，W(碱化度)＝64.5%。

2　试验方法

2.1烧杯试验
　　采用烧杯搅拌试验考察E—PAC对水中的浊度、腐殖质、COD、油的去除效果。模拟的浑浊水和含腐殖质水分别采用高岭土和富里酸(山西产)加1∶1的自来水和去离子水配制，生活污水和含油废水均为实际水样。烧杯搅拌试验在美国产六联搅拌器上进行，使用2