Fouling and cleaning of microfiltration membrane in municipal wastewater reclamation.

This paper presents an investigation on fouling and cleaning of a tubular microfiltration membrane for municipal wastewater reclamation. A bi-level complex model, namely channel clogging and pore plugging, was introduced to elucidate the fouling mechanism. Based on 135 days of microfiltration of activated sludge, a preventive method for channel clogging was reasonably proposed and proven to be effective. Without channel clogging, the operation period was observed a five-fold increase on average, reaching 3-4 weeks. To remove pore plugging, a multi-step chemical cleaning was employed and further optimized in terms of temperature and alkaline concentration. Generally, the chemical cleaning could restore the membrane permeability to higher than 90%.

[1]  George Tchobanoglous,et al.  Wastewater Engineering Treatment Disposal Reuse , 1972 .

[2]  Yoshihito Osada,et al.  Membrane Science and Technology , 1992 .

[3]  G. K. Anderson,et al.  Use of crossflow microfiltration in wastewater treatment , 1997 .

[4]  Munir Cheryan,et al.  Ultrafiltration and Microfiltration Handbook , 1998 .

[5]  In-Soung Chang,et al.  Membrane filtration characteristics in membrane-coupled activated sludge system -- the effect of physiological states of activated sludge on membrane fouling , 1998 .

[6]  A. Grasmick,et al.  Floc size distribution in a membrane bioreactor and consequences for membrane fouling , 1998 .

[7]  P. Blanpain-Avet,et al.  The effect of oscillatory flow on crossflow microfiltration of beer in a tubular mineral membrane system – Membrane fouling resistance decrease and energetic considerations , 1999 .

[8]  A. Grasmick,et al.  Influence of hydrodynamics on fouling velocity in a recirculated MBR for wastewater treatment , 1999 .

[9]  M. Jaffrin,et al.  Comparison between filtrations at fixed transmembrane pressure and fixed permeate flux : application to a membrane bioreactor used for wastewater treatment , 1999 .

[10]  Richard J. Wakeman,et al.  Membrane fouling and alternative techniques for its alleviation , 2000 .

[11]  Michel Y. Jaffrin,et al.  Contribution of various constituents of activated sludge to membrane bioreactor fouling , 2000 .

[12]  Xianghua Wen,et al.  Ultrafiltration membrane bioreactor for urban wastewater reclamation , 2000 .

[13]  M. Mercier-Bonin,et al.  How unsteady filtration conditions can improve the process efficiency during cell cultures in membrane bioreactors , 2001 .

[14]  El Hani Bouhabila,et al.  Fouling characterisation in membrane bioreactors , 2001 .

[15]  Y. Qian,et al.  Microfiltration-membrane-coupled bioreactor for urban wastewater reclamation , 2001 .

[16]  Abderrahim Abbas,et al.  Use of fluid instabilities to enhance membrane performance: a review , 2001 .

[17]  Rishi Sondhi,et al.  Role of backpulsing in fouling minimization in crossflow filtration with ceramic membranes , 2001 .