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首页> 外文会议>2011 Membrane technology conference amp; exposition. >Comparison of surface water pretreatment technologies for membrane-based drinking water production processes
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Comparison of surface water pretreatment technologies for membrane-based drinking water production processes

机译：膜基饮用水生产工艺中地表水预处理技术的比较

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A long term side-by-side pilot-scale comparison of different pretreatments prior to surface water nanofiltration was conducted. Conventional clarification was compared to two membrane pretreatments (clarification followed by ultrafiltration and microfiltration alone) and their impact on 3 semi-industrial NF pilot plants (4 to 9 m~3/h) was studied over 3 years. Results showed that pilot plants located after membrane pretreatments (UF or MF) are more prone to fouling compared to pilot plant fed with conventionally pretreated water, even if feed water produced by UF proved to be of higher quality in terms of particles content. This fouling led to an increase of longitudinal pressure drop and water flux was significantly reduced after one year and two years of operation for MF pretreatment and UF pretreatment, respectively. Autopsies were conducted on membrane elements from each line and showed that biological fouling is present on the 3 NF pilot plants but at different extent. In ultrafiltration or microfiltration units, no biological effect occurs whereas reference lane pretreatment comprises dual-media filtration: most available nutrients are probably consumed in this treatment step. This consumption seems sufficient to inhibit biofilm growth in nanofiltration pilot plants.
机译：进行了地表水纳米过滤之前不同预处理的长期并列中试规模比较。将传统的澄清方法与两种膜预处理方法进行了比较（先进行澄清，然后进行超滤和微滤），然后在3年中研究了它们对3种半工业NF中试工厂（4至9 m〜3 / h）的影响。结果表明，与用常规预处理水进料的中试设备相比，膜预处理（UF或MF）后的中试设备更容易结垢，即使用UF生产的进水在颗粒含量方面被证明具有更高的质量。这种污垢导致纵向压力降增加，MF预处理和UF预处理分别运行一年和两年后，水通量显着降低。对每条品系的膜元件进行尸检，结果表明在3个NF试点植物上存在生物结垢，但程度不同。在超滤或微滤装置中，没有生物学作用，而参考泳道预处理包括双重介质过滤：在此处理步骤中可能消耗了大部分可用养分。这种消耗似乎足以抑制纳滤中试植物中生物膜的生长。

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