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首页> 外文会议>2011 Membrane technology conference amp; exposition. >Comparison of Permeability and Fouling Trends for Two Different Generations of Norit Membranes at the Columbia Heights UF Plant
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Comparison of Permeability and Fouling Trends for Two Different Generations of Norit Membranes at the Columbia Heights UF Plant

机译：哥伦比亚高地超滤厂的两代诺芮特膜的渗透性和结垢趋势的比较

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The City of Minneapolis operates a 70 MGD Ultrafiltration (UF) system at Columbia Heightsrnto provide a physical barrier to potential waterborne pathogens in the treatment of therndrinking water supply. The GE plant uses Norit membranes, and was commissioned in 2005.rnDuring 2010 the original membranes were replaced with a new generation of Noritrnmembranes which had a higher permeability but the same cut off (based on LRV accreditationrnfrom the California Department of Public Health).rnThe original membranes at Columbia Heights operated with a fairly stable permeability,rnnormally starting at around 10-14 gfd/psi (250-350 lmh/bar) after a chemical clean, graduallyrnfalling to between 6 and 8 gfd/psi (150-200 lmh.bar) in a period of about 90 days. Foulingrnrates increased during times of poor feed quality, sometimes occurring in late spring withrnsnow melt run off, or autumn, due to heavy rains after the summer. During these periods,rnunstable performance suggested that a change in CEB chemicals or a greater CEB frequencyrnwas required. Also, mechanical problems increased fouling rates sharply.rnThe new generation membranes have started operation with higher permeability levels, andrnhave stabilized at a permeability 1.5-2.0 times that of the original membranes. Although thernfouling rate within a CEB cycle is similar, it has been possible to extend the CEB interval byrnusing an improved CEB procedure, and also due to the higher starting level.rnThe new membranes respond well to the cleaning procedures used. The long term downwardrndrift of permeability which characterized the original membranes has not so far occurred withrnthe new membranes. As a result, more extensive clean-in-place procedures (CIP) have beenrnunnecessary in the first 6 months of operation. It is likely that the higher permeability of thernnew membranes has reduced the tendency for pore plugging and reduced the foulingrnpropensity of the membranes.
机译：明尼阿波利斯市在哥伦比亚高地运行70 MGD超滤（UF）系统，为饮用水处理中的潜在水生病原体提供物理屏障。 GE工厂使用Norit膜，并于2005年投产.2010年，原始膜被新一代Noritrn膜所替代，该膜具有更高的渗透性但截留率相同（基于加州公共卫生部的LRV认证）。哥伦比亚高地的原始膜以相当稳定的渗透率运行，通常在化学清洗后通常从约10-14 gfd / psi（250-350 lmh / bar）开始，逐渐下降到6至8 gfd / psi（150-200 lmh）。条），大约需要90天。饲料质量差的时候污垢率会增加，有时会在春季末期融雪流失或秋季，这是由于夏季过后的大雨。在这些时期内，性能不稳定表示需要更换CEB化学品或提高CEB频率。而且，机械问题也大大增加了结垢率。新一代膜已经以较高的渗透率水平开始运行，并且已稳定在渗透率是原始膜的1.5-2.0倍。尽管CEB循环中的结垢率相似，但可以通过使用改进的CEB程序来延长CEB间隔，并且由于起始水平更高。新膜对所用的清洁程序反应良好。到目前为止，新膜尚未出现长期渗透率向下漂移的现象，这种现象是原始膜的特征。因此，在运行的前6个月中，不再需要进行更广泛的就地清洁程序（CIP）。新膜的较高渗透性可能降低了孔堵塞的趋势并降低了膜的结垢倾向。

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