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THE EFFECT OF FEED PRETREATMENT ON MEMBRANE MICROFILTRATION OF TITANIUM DIOXIDE DISPERSIONS BY CERAMIC TUBULAR MEMBRANES
Authors: Grulich Miroslav | Mikulášek Petr
Year: 2015
Type of publication: ostatní - článek ve sborníku
Name of source: EuroMed 2015: Desalination for Clean Water and Energy - Cooperation among Mediterranean Countries of Europe and the MENA Region: book of abstracts
Publisher name: European Desalination Society
Place: Řím
Page from-to: nestránkováno
Titles:
Language Name Abstract Keywords
eng THE EFFECT OF FEED PRETREATMENT ON MEMBRANE MICROFILTRATION OF TITANIUM DIOXIDE DISPERSIONS BY CERAMIC TUBULAR MEMBRANES The influence of a coagulant type and operating parameters on crossflow microfiltration of aqueous dispersions of titanium dioxide has been examined. The experiments were carried out with a tubular ceramic microfiltration membrane of nominal pore size 0.1 µm at various operating parameters. Three chosen types of organic coagulants were used for a series of crossflow microfiltration experiments: polyacrylamide (PAM), poly(diallyldimethyl-ammonium chloride) (pDADMAC) and poly(acrylamide-co-acrylic acid) partial sodium salt (PACA). The value of steady-state permeate flux has been experimentally evaluated for the crossflow microfiltration with and without pretreatment. The results of the experiments without coagulants have shown that initial flux declines rapidly, but after an initial decline, the flux is stabilized. The results also suggest that pDADMAC is a better coagulant for this system and its optimal concentration is 30 mg l–1. Finally it is shown that the feed pretreated by pDADMAC has resulted in more than three-times higher permeate flux than that without any pretreatment. Moreover, there was a very positive effect of this coagulant on the particle size. Pretreatment by 30 mg l–1 pDADMAC has led to almost eighteen-times higher average particle size compared to the average particle size without pretreatment. The other two coagulants did not show such improvements as pDADMAC; pretreatment of the feed by PAM giving only a 10 % higher permeate flux whilst the pretreatment of the feed by PACA causing even lower permeate flux than those without any pretreatment. This means that the results of various experiments have shown the need for careful selection of the coagulant due to their differing influence on the permeate flux. The relationship between particle sizes of dispersion and permeate flux was found from results of this experiments. Mathematical model published has been used to estimate the permeate flux. Microfiltration, Pretreatment, Coagulation, Ceramic membrane, Particle size

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