Abstract
This study investigated the influence of cold source water temperature (0.3, 5 and 10 °C) on dynamic changes in membrane structure and the effectiveness of subsequent recovery treatment using warm water. The experimental results indicate that statistically significant shrinkage of membrane pores occurred under cold temperatures. After the exposure to cold temperatures for 24 h, a reduction in d50 (medium of membrane pores) by 25%, 20% and 11% compared to the virgin membranes (control) was observed at 0.3 °C, 5 °C and 10 °C, respectively. The change in membrane structure caused by cold source water could influence membrane plant performance.Warm water recovery treatment of membranes following exposure to cold temperatures was able to restore the membrane pores. Warm water at 35 °C could fully recover the shrunken pores to those of virgin membranes within 8 h, while the membrane pore sizes were not able to reach the original status even with prolonged treatment at room temperature.
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