共查询到19条相似文献,搜索用时 203 毫秒
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超滤膜的零污染通量及其在城市水处理工艺中的应用 总被引:1,自引:0,他引:1
对于超滤膜在城市水处理工艺中的应用,选择合适的膜通量和控制膜污染是其成功的关键所在。围绕上述关键点,结合城市超滤水厂的运行要求,系统论述了超滤膜零污染通量和经济通量的关系,并以东营超滤水厂为例,开展了超滤膜的零污染通量生产性试验,确定了该水厂在不同条件下的超滤膜零污染通量。超滤膜零污染通量相关内容的研究将可能成为膜技术发展的一个新方向。 相似文献
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本文介绍了超滤在市政领域水处理中的应用情况和研究进展,同时通过对两个超滤水厂的分析,讨论了针对不同水源采用不同超滤组合工艺的可行性,超滤工艺的产水稳定性以及相对于常规工艺,超滤饮用水工艺的优势。本文详细讨论了两座超滤水厂的制水成本,分析得出超滤饮用水工艺具有经济性,具有很强的竞争力和很好的发展前景。 相似文献
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由于上海徐泾地区对自来水量需求的增加和饮用水新标准的执行,上海徐泾水厂分别采用热致相PVDF膜与PVC合金膜浸没式超滤膜对水厂进行了升级改造,升级改造后的系统具有膜装填密度高,产水水质好,自动化程度高和运行能耗较低的特点。 相似文献
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根据原水低浊、高藻、碱度及硬度偏低的特点,充分利用水厂现有构筑物进行升级改造,通过试验确定采用絮凝沉淀+活性炭滤池+超滤的净水工艺,并预留再矿化工艺。分析了中试系统的处理效果,并对升级改造的活性炭滤池、超滤膜等主要构筑物设计进行了阐述。 相似文献
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超滤技术用于饮用水处理领域案例分析 总被引:3,自引:2,他引:1
介绍了超滤技术在饮用水处理领域的应用情况,分别对以地表水和地下水为原水的两座超滤水厂进行分析,讨论了针对不同水源采用不同超滤组合工艺的可行性、超滤工艺的产水稳定性以及超滤相对于常规工艺所具备的优势.对两座超滤水厂制水成本的分析表明,超滤饮用水工艺既具有经济性,又具有很强的竞争力和良好的发展前景. 相似文献
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超滤技术已广泛应用于城镇给水处理厂,使得饮用水水质得到显著改善。不同材质超滤膜的运行周期、膜通量、跨膜压差(TMP)等的变化规律会有显著的差异,需要根据各自的特点对超滤系统进行运行参数调控与优化,以保证超滤系统的长期稳定运行。分析了山东某大型超滤水厂超滤系统长期运行的特点,对比了PVC膜和PVDF膜孔结构特征、膜通量、跨膜压差变化趋势及膜过滤阻力特性,调控和优化超滤系统运行参数,并进行了长时间的运行验证。结果表明,膜孔径和膜孔结构不同造成的膜污染是PVC膜与PVDF膜过滤特性差异的主要因素,恒定过滤周期运行模式下PVC膜通量加速衰减时段为82~220 min,造成PVC膜通量衰减了9. 14%,并形成了约5%的永久衰减膜通量,而PVDF膜的通量衰减并不明显,使得水厂超滤系统在恒定过滤周期(180min)运行模式下,出现了PVC膜的污染速率明显高于PVDF膜、系统的运行工况出现显著差异的现象。按照恒定过滤阻力模式运行时,PVC膜和PVDF膜的最佳过滤周期范围分别为82~108 min和96~155 min。水厂超滤系统在恒定过滤阻力运行模式下将PVC膜与PVDF膜在高温期和低温期的过滤周期分别调整为110、90 min和150、120 min,TMP的增长速率和化学维护清洗周期均基本一致,超滤系统实现了长期稳定运行。研究成果为我国超滤水厂中不同材质超滤膜的运行参数优化及协同稳定运行提供了参考。 相似文献
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Boudaud N Machinal C David F Fréval-Le Bourdonnec A Jossent J Bakanga F Arnal C Jaffrezic MP Oberti S Gantzer C 《Water research》2012,46(8):2651-2664
The removal of MS2, Qβ and GA, F-specific RNA bacteriophages, potential surrogates for pathogenic waterborne viruses, was investigated during a conventional drinking water treatment at pilot scale by using river water, artificially and independently spiked with these bacteriophages. The objective of this work is to develop a standard system for assessing the effectiveness of drinking water plants with respect to the removal of MS2, Qβ and GA bacteriophages by a conventional pre-treatment process (coagulation-flocculation-settling-sand filtration) followed or not by an ultrafiltration (UF) membrane (complete treatment process). The specific performances of three UF membranes alone were assessed by using (i) pre-treated water and (ii) 0.1 mM sterile phosphate buffer solution (PBS), spiked with bacteriophages. These UF membranes tested in this work were designed for drinking water treatment market and were also selected for research purpose.The hypothesis serving as base for this study was that the interfacial properties for these three bacteriophages, in terms of electrostatic charge and the degree of hydrophobicity, could induce variations in the removal performances achieved by drinking water treatments.The comparison of the results showed a similar behaviour for both MS2 and Qβ surrogates whereas it was particularly atypical for the GA surrogate. The infectious character of MS2 and Qβ bacteriophages was mostly removed after clarification followed by sand filtration processes (more than a 4.8-log reduction) while genomic copies were removed at more than a 4.0-log after the complete treatment process. On the contrary, GA bacteriophage was only slightly removed by clarification followed by sand filtration, with less than1.7-log and 1.2-log reduction, respectively. After the complete treatment process achieved, GA bacteriophage was removed with less than 2.2-log and 1.6-log reduction, respectively.The effectiveness of the three UF membranes tested in terms of bacteriophages removal showed significant differences, especially for GA bacteriophage. These results could provide recommendations for drinking water suppliers in terms of selection criteria for membranes.MS2 bacteriophage is widely used as a surrogate for pathogenic waterborne viruses in Europe and the United States. In this study, the choice of MS2 bacteriophage as the best surrogate to be used for assessment of the effectiveness of drinking water treatment in removal of pathogenic waterborne viruses in worst conditions is clearly challenged. It was shown that GA bacteriophage is potentially a better surrogate as a worst case than MS2. Considering GA bacteriophage as the best surrogate in this study, a chlorine disinfection step could guaranteed a complete removal of this model and ensure the safety character of drinking water plants. 相似文献
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