LINJing-fang,ZHANGXin-ying,ZHANGLi-min,et al.Membrane Cleaning Effect and Membrane Performance Change in MBR Projects during Long-term Operation[J].China Water & Wastewater,2022,38(No.3):67-73.
Membrane Cleaning Effect and Membrane Performance Change in MBR Projects during Long-term Operation
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
No.第3
Page:
67-73
Column:
Date of publication:
2022-02-01
- Keywords:
- membrane bioreactor; chemical cleaning; membrane performance
- Abstract:
- To explore the effects of different service life and cleaning schemes on membrane performance in membrane bioreactor (MBR) projects during long-term operation, the existing membrane cleaning effect in three MBR projects was evaluated, and the mechanical strength, contact angle, infrared spectrum and other aspects of the membrane were analyzed. Some organic and inorganic foulants still remained on the membrane surface of the three MBR projects after recovery cleaning. Among them, MBR in phase Ⅳ project of Yangli WWTP which had the longest operation time (5 years), had a poor organic fouling cleaning effect, and there were more floc fiber residues on the membrane surface. The inorganic foulants were mainly Ca and Fe, and citric acid had a good removal effect on inorganic foulants containing Fe element. The mechanical strength of the membrane might decrease with the increase of the service time and membrane aging. The membrane cleaning frequency had a certain influence on the mechanical properties of the membrane, and cleaning agent would destroy the hydrophilic modifier on the membrane surface, resulting in the decrease of membrane hydrophilicity.
Last Update:
2022-02-01