高梯度磁化控制纳滤膜无机垢污染的研究

Research on inorganic scale pollution control of nano-filtration membrane using high gradient magnetizing pretreatment

实验对比分析了有无磁化预处理条件下纳滤膜的无机垢污染情况。研究结果发现,磁化预处理能够有效减缓膜比通量的衰减,低压冲洗后膜比通量恢复率可高达90%,而无磁化预处理的纳滤膜通量恢复率仅为68%。SEM分析发现,加上磁化预处理后,纳滤膜表面生成的Ca CO3垢不再是致密的方解石,而是质地松软、易脱落的文石结构,这更有利于维持纳滤膜的稳定运行。

The situation of inorganic scale pollution of nano-filtration（NF） membrane by or not by magnetizing pre-treatment has been contrasted and analyzed. It is found that magnetizing pretreatment can effectively retard the de-cline of membrane specific flux. After rinsed under low pressure ,the membrane specific flux recovering rate can be as high as 90%. But the flux recovering rate of nano-filtration membrane that has not been pretreated by magnetiza-tion process is only 68%. According to SEM analysis,after being pretreated by magnetization process,the CaCO3 scale formed on the surface of nano-filtration membrane is soft and caduceus aragonite ,instead of dense calcite. The fact is more advantageous for the nano-filtration membrane to keep stable operation.