BROWSE

Related Researcher

Author's Photo

Cho, Jaeweon
OWIELAB(Organic-Water Interface Engineering Laboratory)
Research Interests
  • Convergence of Science and Arts, Feces Standard Money (FSM), Water & Energy

ITEM VIEW & DOWNLOAD

Variations in backwash efficiency during colloidal filtration of hollow-fiber microfiltration membranes

Cited 18 times inthomson ciCited 20 times inthomson ci
Title
Variations in backwash efficiency during colloidal filtration of hollow-fiber microfiltration membranes
Author
Hong, SeungkwanKrishna, PraveenHobbs, ColinKim, DoheeCho, Jaeweon
Keywords
Backwashing efficiency; Cake layer structure; Colloidal fouling; Microfiltration; Water treatment
Issue Date
2005-03
Publisher
ELSEVIER SCIENCE BV
Citation
DESALINATION, v.173, no.3, pp.257 - 268
Abstract
A series of filtration experiments was performed systematically to investigate physical and chemical factors affecting the efficiency of backwashing during microfiltration of colloidal suspensions. In this study, all experiments were conducted in dead-end filtration mode utilizing an outside-in, hollow-fiber module with a nominal pore size of 0.1 mu m. Silica particles (mean diameter = 0.14 mu m) were used as model colloids. Using a flux decline model based on the Happel's cell for the hydraulic resistance of the particle layer, the cake structure was determined from experimental fouling data and then correlated to backwash efficiency. Modeling of experimental data revealed no noticeable changes in cake layer structure when feed particle concentration and operating pressure increased. Specifically, the packing density of the cake layer (1-cake porosity) in the cake layer ranged from 0.66 to 0.67, which corresponds well to random packing density. However, the particle packing density increased drastically with ionic strength. The results of backwashing experiments demonstrated that the efficiency of backwashing decreased significantly with increasing solution ionic strength, while backwash efficiency did not vary when particle concentration and operating pressure increased. This finding suggests that backwash efficiency is closely related to the structure of the cake layer formed during particle filtration. More densely packed cake layers were formed under high ionic strength, and consequently less flux was recovered per given backwash volume during backwashing
URI
Go to Link
DOI
10.1016/j.desal.2004.07.049
ISSN
0011-9164
Appears in Collections:
UEE_Journal Papers
Files in This Item:
1-s2.0-S0011916404007222-main.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

MENU