HE Lin-juan,ZOU Kang-bing,SHENG Yun-ge,et al.Control Effect of Pretreatment on Membrane Fouling during Ultrafiltration of Dongjiang River Raw Water[J].China Water & Wastewater,2021,37(1 1):16-21.
Control Effect of Pretreatment on Membrane Fouling during Ultrafiltration of Dongjiang River Raw Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
1 1
Page:
16-21
Column:
Date of publication:
2021-01-01
- Keywords:
- ultrafiltration; membrane fouling; pretreatment; natural organic matter; coagulation; adsorption; oxidation
- Abstract:
- Effects of different pretreatment processes (coagulation, adsorption and oxidation) and their combinations on removal of organic pollutants in raw water of Dongjiang River in Pearl River Basin and control of ultrafiltration membrane fouling were explored. For removal of natural organic matter in raw water of Dongjiang River, the optimal dosages of coagulant (polyaluminum), adsorbent (powdered activated carbon) and oxidant (kMnO4) were 20 mg/L, 30 mg/L and 0.1 mg/L, respectively. Three single pretreatment process could effectively alleviate membrane flux attenuation, while pairwise combined pretreatment processes could further alleviate membrane fouling. The combined pretreatment of polyaluminum and powdered activated carbon exhibited the best control effect on fouling of the polyvinylidene fluoride membrane. Polyaluminum and kMnO4 had better removal efficiency of UV254 and protein compared with that of powdered activated carbon. However, the three pretreatment processes had poor removal efficiency of polysaccharides (<40%), among which, powdered activated carbon was slightly better than polyaluminum and kMnO4. In addition, the three single pretreatment processes were more effective in removing humiclike fluorescent substances than protein-based fluorescent substances, while combined pretreatment processes could significantly reduce the response intensity of these two types of fluorescent substances. Among them, the combined pretreatment process of polyaluminum and powdered activated carbon had the best removal effect on each fluorescent component of organic matter. Through the identification and analysis of membrane fouling components， it was showed that the main fouling substances during ultrafiltration of Dongjiang River raw water included humic acids, polysaccharides and proteins. Among them, chemically irreversible foulants were polysaccharides and a small amount of humic acids, whereas the chemically reversible foulants were proteins and some humic acids.
Last Update:
2021-01-01