摘要
以高浊度河水为实验用水进行常规混凝沉淀和磁加载混凝沉淀实验研究,考察了混凝剂、助凝剂以及磁粉投加量对浊度去除效率的影响。结果表明,当原水浊度在200 NTU以下时,磁加载混凝反应PAC、PAM和磁粉最佳投加量分别为10、0.2、75 mg/L,浊度去除率大于97%,出水浊度小于3 NTU,PAC的投加量与常规混凝相比减少50%以上;通过测定反应体系的ζ电位、观察絮体结构特征初步探究了磁粉影响混凝反应的机理,磁加载混凝形成的磁絮体结构紧密,有利于沉淀分离;在小试实验结论的基础上设计5 m^3/h磁加载混凝沉淀中试装置并进行中试实验。结果表明,当磁加载混凝沉淀表面负荷为10 m^3/(m^2·h)、原水浊度在200~500 NTU时,出水浊度均小于3 NTU,去除率达到98%~99.4%,出水浊度达到GB 5749-2006。磁加载混凝设备具有体积小、重量轻,水质好的优点,适用于高浊度原水的应急饮用水处理。
The experiment of conventional and magnetic coagulating sedimentation for high-turbidity river water treatment was carded out, and the effects of the dosage of coagulants, coagnlant aids, and magnetic powder on the turbidity removal efficiency were studied. The results showed that, for magnetic coagulation, when the turbidity of raw water was below 200 NTU,the optimum dosages ofPAC, PAM and magnetic powder were 10 mg/L, 0.2 mg/L and 75 mg/L respectively which gave a turbidity removal rate over 97% and a turbidity of effluent below 3 NTU. Especially, the dosage of PAC was reduced over 50% when compared to the conventional coagulation. By measuring the Zeta potential and observing the floe structure, the mechanism of the magnetic coagulation was preliminary discovered. The floc structure formed in the magnetic coagulation was more compact, which facilitated rapid precipitation and separation. Based on the experiment, a 5 m3/h magnetic coagulation pilot device was designed for testing and the result showed that when the surface load was 10 m3/（m2.h） and the turbidity of raw water was 200~500 NTU, the turbidity of effluent was below 3 NTU and the removal rate reached 98%~99.4%, which met the standard of＇standard for drinking water quality＇ （GB5749-2006）. Magnetic coagnlation device was light and small in size and provided high quality effluent, which was suitable for the emergency drinking water treatment of high-turbidity raw water.
出处
《水处理技术》
CAS
CSCD
北大核心
2017年第9期104-108,共5页
Technology of Water Treatment
基金
国家科技支撑计划资助项目(2014BAK13B03)
关键词
磁加载混凝
高浊度原水
应急水处理
表面负荷
中试实验
magnetic loading coagulation
high-turbidity wastewater
emergency water treatment
surface loading rate
pilot test
