摘要
以向地表水中投加的隐孢子虫微球和贾第鞭毛虫微球为对象,研究通过对给水混凝工艺对其的去除效果进行比较,着重考察了不同混凝剂种类、投加量及水样pH值对去除效果的影响。结果表明,混凝工艺可较为有效地去除地表水中的两虫微球,去除率最高可达4 lg。相比常规的金属盐类混凝剂,高分子的PAC、PAFC混凝剂对两虫微球的混凝去除率更高;投加量为40~70 mg/L,pH为8时,PAC对两虫微球去除的效果最佳;投加量为20~70 mg/L,pH为6~8时,PAFC对两虫微球去除的效果最佳,而硫酸铝、硫酸铁、氯化铁的效果相对稍差。整体上PAC、硫酸铝等铝盐混凝剂对贾第鞭毛虫微球的去除率高于隐孢子虫微球的去除率,而PAFC、硫酸铁等含铁盐对隐孢子虫微球的去除率高于贾第鞭毛虫微球的去除率;铝盐混凝剂对两虫微球的整体去除率高于铁盐混凝剂。
Coagulation process was tested to remove Cryptosporidium and Giardia microspheres in surface water from a reservoir in Xiamen.The effects of different parameters including coagulant types,dosages,and pH on these microspheres removal were studied.It was found that coagulation would be an efficient method in Cryptosporidium and Giardia removal（up to 4 lg）.Polymer coagulants including PAC and PAFC were more suitable to be applied to remove the microspheres than traditional inorganic metal coagulants.Optimized operation condition for PAC application was： dosage of 40~70 mg/L and pH of 8;for PAFC was： dosage of 20~70 mg/L and pH of 6~8.The removal of Giardia microsphere using aluminum coagulants including PAC and aluminum sulfate was higher than that of Cryptosporidium microsphere,while the removal rate of Giardia microsphere using iron salt coagulants including PAFC,ferric sulfate was higher than that of Cryptosporidium microsphere.Overall,the removal of the two pathogen microspheres using aluminum coagulants was higher than that of iron salt coagulant.
出处
《环境工程学报》
CAS
CSCD
北大核心
2011年第1期65-69,共5页
Chinese Journal of Environmental Engineering
基金
中国科学院百人计划项目"城市饮用水生物安全性及其控制技术"(2009-2011)
关键词
地表水
隐孢子虫
贾第鞭毛虫
荧光微球
混凝
去除
Cryptosporidium
Giardia
surface water
flocculation
polystyrene microspheres
removal
