XIEYa-wei,YUWen-qing,FANCheng-yue,et al.Performance Evaluation of Nanofiltration Membranes Scale Inhibitors for Drinking Water Treatment[J].China Water & Wastewater,2024,40(3):23-30.
给水处理纳滤膜阻垢剂性能评价
- Title:
- Performance Evaluation of Nanofiltration Membranes Scale Inhibitors for Drinking Water Treatment
- 摘要:
- 针对浙江某给水厂纳滤（NF）工程筛选合适的阻垢剂的需求，采用静态法和改进的动态法评价了5种商品阻垢剂（3种含磷、2种不含磷）。静态实验表明，5种阻垢剂的阻垢效果存在差异，但实验条件与实际工程运行环境差距大，无法得出适用于工程需要的阻垢剂最优投加量。在改进的基于浓缩原水的部分循环法动态实验中，5号阻垢剂在投量为2 mg/L时阻垢性能最优，但会导致NF浓水磷浓度超出0.06 mg/L的限值；在满足浓水TP要求下，2号阻垢剂、2 mg/L投量为最佳选择。静态和动态实验均表明，含磷阻垢剂的阻垢性能优于无磷阻垢剂。阻垢剂缓解膜污染的效果与膜比通量变化具有较好的相关性，且动态实验未造成膜的机械损伤以及影响膜截留能力。每组动态实验时间仅为2 h，实验条件更接近实际工程环境，可为阻垢剂选用提供更为合理的依据。
- Abstract:
- To meet the needs of the nanofiltration project in a drinking water plant in Zhejiang Province, five kinds of commercial scale inhibitors (three containing phosphorus and two without phosphorus) were evaluated by the static method and improved dynamic method. The static experiment showed differences in the effect of the five scale inhibitors, however, there was a critical difference between the experimental conditions and the actual engineering operation environment, so it was impossible to obtain the optimal dosage of scale inhibitors suitable for engineering needs. In the dynamic experiment based on an improved partial circulating method for concentrated raw water, performance of No.5 scale inhibitor was the best under the dosage of 2 mg/L, but the phosphorus concentration in concentrates exceeded 0.06 mg/L. Under the conditions of meeting the TP requirements for concentrated water, the best choice was No.2 scale inhibitor with the dosage of 2 mg/L. Both the static and dynamic experiments showed that the scale inhibition performance of containing phosphorus scale inhibitors were better than that of non-phosphorus scale inhibitors. The analysis of membrane fouling showed that the effect of scale inhibitors on alleviating membrane fouling was highly correlated with normalized flux. The analysis of membrane damage and water quality proved that the experiment would not lead to mechanical damage and change the rejection characteristics of the membrane. The dynamic experiment time of each group was only 2 hours, and the operating conditions were closer to the actual engineering environment, which could provide a reasonable basis for the selection of scale inhibitors.
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