混凝-超滤工艺残余铝含量调控方式优化研究  

Optimization of coagulation-ultrafiltration process based on residual aluminum control

作　　者：何溢恬 唐娜 黄鑫 李天玉[3] 石宝友[1,2] HE Yitian;TANG Na;HUANG Xin;LI Tianyu;SHI Baoyou(State Key Laboratory of Environmental Aquatic Chemistry,Research Center for Eco-EnvironmentaI Sciences,Chinese Academy of Sciences,Beijing 100085,China;University of Chinese Academy of Science,Beijing 101407,China;Beijing Origin Water Technology Co.,Ltd.,Beijing 101407,China)

机构地区：[1]中国科学院生态环境研究中心环境水质学国家重点实验室,北京100085 [2]中国科学院大学,北京101407 [3]北京碧水源科技股份有限公司,北京101407

出　　处：《给水排水》2022年第3期22-28,共7页Water & Wastewater Engineering

基　　金：纳滤饮用水处理工艺技术研究与产业化(建司局函标[2020]131号)。

摘　　要：考察了前调pH和后调pH、两段加药及复合混凝剂对混凝-超滤工艺处理长江原水的出水残余铝的控制效果。结果表明,CO_(2)调节长江原水pH至6.5时采用30%/70%的两段加药方式是安全且最有效的降低出水残余铝含量的方式。快搅后的pH降低至6.3~6.4之间时可以将二次投加的PAC中更多的溶解铝转化为颗粒铝并被超滤去除。此外,使用复合混凝剂PAC-PDM也可以降低超滤出水残余铝,并且调节pH对PAC-PDM的处理效果影响并不大,说明PAC-PDM对pH的适应性比PAC更好。This study investigated the effects of pre-and post-adjustment of pH,two-stage coagulation addition and composite coagulant on the control of residual aluminum in the effluent of the coagulation-ultrafiltration process for the treatment of Yangtze raw water.The results showed that residual aluminum could be safely and most effectively reduced by the 30%/70% two-stage coagulant addition strategy when adjusting the pH of raw water to 6.5 by CO_(2).More soluble aluminum transferred to particulate aluminum and removed by ultrafiltration when pH after rapid mixing was between 6.3 and 6.4.Therefore,more residual aluminum was removed by ultrafiltration by 30%/70%strategy.In addition,the use of the composite coagulant PAC-PDM also reduced the residual aluminum in the ultrafiltration effluent,and the effect of pH adjustment on PAC-PDM was not significant,indicating that PAC-PDM had better adaptability to pH adjustment than PAC.

关 键 词：残余铝 混凝-超滤 PH 两段加药 复合混凝剂 

分 类 号：TU991.22[建筑科学—市政工程]