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.
Enhancing an adsorption-membrane hybrid system with microground activated carbon
Y. Matsui, Y. Fukuda, T. Inoue, T. Matsushita, N. Aoki, S. Mima; Enhancing an adsorption-membrane hybrid system with microground activated carbon. Water Science and Technology: Water Supply 1 December 2004; 4 (5-6): 189–197. doi: https://doi.org/10.2166/ws.2004.0108
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