ZHANGRui-jun,FENGXiao-lin,XIAOFeng,et al.Optimization of Chemical Cleaning Protocol for Ultrafiltration Membrane Maintenance in a Water Purification Plant in Tianjin[J].China Water & Wastewater,2025,41(19):8-15.
Optimization of Chemical Cleaning Protocol for Ultrafiltration Membrane Maintenance in a Water Purification Plant in Tianjin
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第19期
Page:
8-15
Column:
Date of publication:
2025-10-01
- Keywords:
- ultrafiltration; membrane fouling; chemical cleaning; transmembrane pressure recovery rate
- Abstract:
- This study systematically investigated key parameters including the contact mode of cleaning agents, cleaning duration, chemical concentration, and cleaning sequence, focusing on their impact on the recovery rate of transmembrane pressure, and analyzed the surface morphology and functional group composition of the original membrane, fouled membrane, and cleaned membrane using scanning electron microscopy (SEM) and attenuated total reflectance Fourier?transform infrared spectroscopy (ATR-FTIR), so as to address the issue of the unsatisfactory cleaning performance of the current maintenance chemical cleaning protocol for ultrafiltration membranes at a water purification plant in Tianjin. The primary foulants on the membrane surface included organic matters such as humic substances, proteins, and polysaccharides. Two consecutive cleaning cycles were performed using 450 mg/L sodium hypochlorite followed by 500 mg/L citric acid as cleaning agents. Each cleaning cycle consisted of 10 minutes of isobaric circulation, 40 minutes of cross-flow circulation, and 10 minutes of immersion. Under this cleaning protocol, a significantly improved cleaning performance was achieved, with the transmembrane pressure recovery rate increasing from the initial 31.6% to 91.9%. It was further proposed to incorporate 100 mg/L of sodium chloride into the first cycle of the aforementioned cleaning protocol with the aim of enhancing the cleaning efficiency. The results indicated that this modification increased the transmembrane pressure recovery rate to 94.7%.
Last Update:
2025-10-01