Water Science & Technology Vol 41 No 10-11 pp 317–325 © IWA Publishing 2000
Fouling performance in the filtration of water containing humic acid and/or
kaolin with microporous membrane
S Fukada*, T Tsuji**, T Minegishi***, S Yamamoto****, T Itazawa***** and K Matsumoto******
*
Engineering Research Center, NKK Corporation, 1-1, Minami-watarida-cho, Kawasaki-ku, Kawasaki,
210-0855 Japan
**
Engineering Research Center, NKK Corporation, 1-1, Minami-watarida-cho, Kawasaki-ku, Kawasaki,
210-0855 Japan
***
Engineering Research Center, NKK Corporation, 1-1, Minami-watarida-cho, Kawasaki-ku, Kawasaki,
210-0855 Japan
****
Dept. of Chemical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, 240-8501 Japan
*****
Dept. of Chemical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, 240-8501 Japan
******
Dept. of Chemical Engineering, Yokohama National University, 79-5, Tokiwadai, Hodogaya-ku, Yokohama, 240-8501 Japan
ABSTRACT
Acceleration tests were done using the small-scale microporous membrane (MF)
module to predict the increase in transmembrane pressure at the constant
flow rate dead-end filtration in a pilot plant for treating the river water
or dam water. The kaolin suspension, solution of humic acid and the mixture
of kaolin and humic acid were used as feed water in the acceleration tests.
The conventional equations of medium blocking filtration were applied to
predict the pressure increase for both pilot plant tests and small-scale
ones. The experimental results are summarized as follows:
(1) The pilot plant tests: The time course of transmembrane pressure was
expressed by the complete blocking filtration equation or the standard one
when the unstable time at the beginning of operation was excluded.
(2) The acceleration tests using small-scale membrane module:
(a) No increase in transmembrane pressure was observed when the kaolin
suspension and the bentonite one were used as feed water,
(b) The increasing rate of transmembrane pressure was lowered by the
addition of coagulant into the humic acid solution,
(c) The humic acid had a great influence on the increasing rate of
transmembrane pressure in the filtration of water containing kaolin or
no kaolin and
(d) Similar curves of filtration time vs. transmembrane pressure were
obtained in the acceleration tests as were obtained in pilot plant tests.
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