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The effect of feed pretreatment on membrane microfiltration of titanium dioxide dispersions by ceramic tubular membranes

机译：陶瓷管状膜饲料预处理对二氧化钛分散体膜微滤的影响

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摘要

The influence of 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 with a nominal pore size of 0.1m at various operating parameters. Three chosen types of organic coagulants were used for a series of crossflow microfiltration experiments: polyacrylamide (PAM), poly(diallyldimethylammonium 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 showed that the flux initially declines rapidly and then stabilizes. The results also suggested that PDADMAC was a better coagulant for this system and its optimal concentration was 30mgl(-1). Finally, it was shown that pretreatment of the feed by PDADMAC resulted in a permeate flux that was more than three times higher than that obtained without any pretreatment. Moreover, there was a very positive effect of this coagulant on the particle size. Pretreatment by 30mgl(-1) PDADMAC led to an average particle size that was almost 18 times higher than that obtained without pretreatment. The other two coagulants did not produce such improvements: pretreatment of the feed by PAM increased the permeate flux by only 10%, while pretreatment by PACA gave even lower permeate flux than no pretreatment. This means that the results of various experiments have shown the need for careful selection of the coagulant due to their differing influences on the permeate flux. The relationship between the particle size of the dispersion and the permeate flux was found from the results of these experiments. A published mathematical model was used to estimate the permeate flux. The results of the experiments showed that the mathematical model was able to predict the steady-state permeate flux quite accurately in some cases.
机译：研究了凝结剂型和操作参数对二氧化钛水分散体的跨流微处理的影响。通过管状陶瓷微滤膜进行实验，标称孔径为0.1m的各种操作参数。三种选择的有机凝结剂用于一系列横流微滤实验：聚丙烯酰胺（PAM），聚（二烯丙基甲基氯化铵）（PDADMAC）和聚（丙烯酰胺 - 共丙烯酸）部分钠盐（PACA）。已经通过实验评估了稳态渗透助焊剂的值，用于横流微滤，具有和无预处理。没有凝结剂的实验结果表明，助焊剂最初迅速下降，然后稳定。结果还表明，PDADMAC是该系统的更好的凝结剂，其最佳浓度为30mg1（-1）。最后，显示通过PDADMAC的饲料预处理导致渗透的助焊剂比在没有任何预处理的情况下获得的渗透剂助熔剂。此外，这种凝结剂对粒径存在非常积极的效果。通过30mgL（-1）PDADMAC的预处理导致平均粒度比在没有预处理的情况下获得的差异几乎高18倍。另外两种凝结剂没有产生这种改进：通过PAM的饲料预处理仅增加了渗透物助焊剂仅10％，而PACA的预处理比没有预处理的预处理降低了渗透物助焊剂。这意味着各种实验的结果表明，由于它们对渗透助焊剂的不同影响，因此需要仔细选择凝结剂。从这些实验的结果中发现分散体的粒度与渗透通量之间的关系。发布的数学模型用于估计渗透助焊剂。实验结果表明，在某些情况下，数学模型能够在某些情况下准确地预测稳态渗透助焊剂。

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