Blocking laws analysis of dead-end constant flux microfiltration of compressible cakes. Academic Article

abstract

• New blocking law models for dead-end constant flux microfiltration of colloids forming cakes that compressed in a linear and power law manner were derived. Constant pressure and constant flux experiments were performed using bacteria, colloidal silica, and treated natural waters to validate these new models and quantitatively verify blocking law predictions on the role of cake compressibility in microfilter fouling. Statistically invariant values of cake specific resistance and compressibility were obtained for constant flux and constant pressure operation for each feed suspension. This suggests that colloids formed cakes whose hydraulic resistance is dominated by a morphology that did not depend on their mode of deposition, confirming that the cake permeability was determined by the instantaneous pressure. Additionally, an inverse relationship between extracellular polymeric substances (EPS) secreted by bacteria and hydrodynamic flux restoration procedures was obtained demonstrating the importance of linking EPS to backwashing frequency when bacteria are present in the feed water.

authors

• Chellam, Shankararaman

published proceedings

• J Colloid Interface Sci

author list (cited authors)

• Chellam, S., & Xu, W.

citation count

• 74

complete list of authors

• Chellam, Shankararaman||Xu, Wendong

publication date

• September 2006

publisher

• Elsevier  Publisher

published in

• Journal of Colloid and Interface Science  Journal

keywords

• Biofilms
• Biofouling
• Compressible Cakes
• EPS
• Microfiltration
• Water And Wastewater Treatment

PubMed Central ID

• 16753173

Digital Object Identifier (DOI)

• 10.1016/j.jcis.2006.04.064

start page

• 248

end page

• 257

volume

• 301

issue

• 1