Water Supply Vol 4 No 5-6 pp 189–197 © IWA Publishing 2005
Enhancing an adsorption-membrane hybrid system with microground activated carbon
Y. Matsui*, Y. Fukuda**, T. Inoue***, T. Matsushita****, N. Aoki***** and S. Mima******
*Department of Civil Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
**Department of Civil Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
***Department of Civil Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
****Department of Civil Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
*****Research & Development Department, NGK Insulators, Ltd., Maegata-cho 1, Handa 475-0825, Japan
******Research & Development Department, NGK Insulators, Ltd., Maegata-cho 1, Handa 475-0825, Japan
ABSTRACT
The effects of particle size and mixing method of adsorbent during pretreatment in a microfiltration system were investigated. Micrometre-size powdered activated carbons (PACs) obtained by pulverization of an as-received PAC removed natural organic matter (NOM) from water much more efficiently than the as-received PAC, without additional membrane fouling and trans-membrane pressure buildup. The dosage of micrometre-size PAC required for pretreatment was one-sixth the equipollent dosage of the as-received PAC. The coagulant - PAC dosing sequence did not affect the extent of NOM removal, suggesting that the reduction of PAC-pore-blocking macromolecules by coagulation before PAC adsorption was not a key factor in improving the final extent of NOM removal. The mechanism of the enhanced adsorption by micrometre-size PAC seems to involve increases in the adsorption capacity itself, as well as increases in adsorption kinetics.
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