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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 turbid water was used as experimental water to carry out conventional coagulation and sedimentation and magnetic loading coagulation and sedimentation experiments. The effects of coagulant, coagulant and magnetic powder dosage on turbidity removal efficiency were investigated. The results show that when the turbidity of raw water is below 200 NTU, the optimal loadings of PAC, PAM and magnetic powder are 10, 0.2 and 75 mg / L respectively, and the turbidity removal efficiency is more than 97% Less than 3 NTU. The dosage of PAC decreased by more than 50% compared with that of conventional coagulation. By measuring the zeta potential of the reaction system and observing the structural characteristics of the floc, the mechanism that the magnetic powder affected the coagulation reaction was investigated. The structure of the magnetic flocs is close, which is propitious to sedimentation and separation. On the basis of the experimental results, a 5 m ~ 3 / h magnetically loaded coagulation pilot plant was designed and piloted. The results show that the turbidity of the effluent is less than 3 NTU and the removal efficiency reaches 98% ~ 99.4 when the magnetic loading coagulation sedimentation surface load is 10 m ~ 3 / (m ~ 2 · h) and the turbidity of raw water is 200 ~ 500 NTU %, Effluent turbidity reached GB 5749-2006. Magnetic loading coagulation equipment has the advantages of small size, light weight, good water quality, suitable for emergency drinking water treatment of high turbidity raw water.