Water Science & Technology Vol 41 No 10-11 pp 77–84 © IWA Publishing 2000
Pilot-plant study of a high recovery membrane filtration process for
drinking water treatment
JY Huang*, S Takizawa** and K Fujita***
*
Department of Environment Science and Human Engineering,
Graduate School of Science and Engineering, Saitama University,
255 Shimo-Okubo, Urawa, Saitama, 338-8570 Japan
**
Department of Urban Engineering, The University of Tokyo, 7-3-1 Hongo,
Bunkyo, Tokyo, 113-8656 Japan
***
Research Development Department, Maezawa Industries, INC. 5-11 Nakachuo,
Kawaguchi, Saitama, 332-8556 Japan (E-mail: huang@maezawa.co.jp)
ABSTRACT
Successful application of energy efficient dead-end micro-filtration (MF),
which does not require recirculation like cross-flow filtration, depends
on achieving high recovery rates. In this study, two different types of
pilot scale membrane systems (horizontally and vertically stretched
membrane filters) were evaluated based on the effects of pre-chlorination,
intermittent chlorination and circulation flow by air-scrubbing.
Additionally, the effects of operating factors including physical
cleaning and chemical cleaning on membrane fouling were examined. The
vertically stretched membranes showed better performance than horizontally
stretched membranes at filtration fluxes of either 0.55 m/day or 0.78 m/day
even under 2.6 to 27.5°C and raw water turbidity higher than 300 units,
as long as intermittent chlorination (10 mg/l once a week) along with the
circulation flow by air-scrubbing (once in 30 minutes) in the housing were
employed. It was demonstrated that the vertically stretched membranes have been operated for one year without chemical cleaning of the membranes,
wherein the recovery of raw water as a filtrate was 97.0% or 98.9%.
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