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.
Performance Evaluation of Nanofiltration Membranes Scale Inhibitors for Drinking Water Treatment
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第3期
Page:
23-30
Column:
Date of publication:
2024-02-01
- 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.
Last Update:
2024-02-01