Membrane and Water Treatment

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Fouling and cleaning of a tubular ultrafiltration ceramic membrane

  • Siddiqui, Farrukh Arsalan (University of Oxford, Department of Engineering Science) ;
  • Field, Robert W. (University of Oxford, Department of Engineering Science)
  • Received : 2015.08.09
  • Accepted : 2016.05.16
  • Published : 2016.09.25
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Abstract

The successful application of cleaning protocols is vital for optimized filtration processes. A series of experiments with an ultrafiltration ceramic tubular membrane were carried out for the foulants dextran and carboxymethyl cellulose. Firstly, the impact on fouling of concentration changes was investigated with the increase in resistance being used as the key parameter. In the second phase, removal of reversible fouling was also investigated by employing intermittent rinsing consisting of a cold water rinse followed by a hot one. A comparative analysis for both foulants is reported. Across a range of concentrations and for both foulants, the reduction in resistance due to rinsing was found to depend upon concentration (C); it changed as $C^n$ where n was found to be 0.3. A plausible semi-theoretical explanation is given. Thirdly, for both foulants, the application of a combination of strong alkaline solutions with oxidizing agent (mainly sodium hypochlorite) followed by acid was found to be appropriate for cleaning of the ceramic membrane. The effect of increased temperature for cleaning agents followed by a warm water rinse contributed positively to the cleaning capability.

Keywords

Acknowledgement

Supported by : Higher Education Commission of Pakistan

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