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Surface Seawater Pretreatment Upstream of Reverse Osmosis: Membrane Polymer Material Impact 反渗透上游表层海水预处理:膜聚合物材料的影响
发布日期: 2003-03-05
海水反渗透(SWRO)淡化装置采用表面敞开式进水口运行 需要有效的预处理,以满足反渗透给水要求。本研究的目的 在进行超滤预处理之前,对超滤的性能进行评估 高污染潜势表面海水。配备Aquasource超滤膜的中试装置 直接在直布罗陀港海水上以死胡同模式运行。超滤效率 针对下游反渗透,对预处理与常规预处理进行了评估 液压性能。 研究结果表明,UF预处理产生了非常好和稳定的质量 渗透液,其SDI值低于简单的单级双介质产生的渗透液 过滤预处理。确定了造成UF污染的主要海水成分 作为浮游生物释放的有机物。使用低剂量预混凝 UF有助于控制这种结垢的可能性,导致稳态水力条件和较低的温度 清洁频率。 在较高的回收率和回收率下,对UF下游反渗透膜的性能进行了评估 更高的通量率操作条件,以解决UF与其他设备相比的成本差异 常规预处理,使SWRO装置的设计降低了运营费用和成本 增加了操作的便利性。包括12个参考文献、表格和图表。
Seawater Reverse Osmosis (SWRO) desalination plants operating with surface open intakes require an efficient pretreatment to meet RO feedwater requirements. The objective of this study was to assess the performance of ultrafiltration (UF) pretreatment prior to RO for the treatment of high fouling potential surface seawater. A pilot plant equipped with Aquasource UF membranes was operated in dead-end mode directly on Gibraltar harbor seawater. The efficiency of UF pretreatment was evaluated against conventional pretreatment with respect to downstream RO hydraulic performance. Results of the study illustrated that UF pretreatment yielded a very good and steady quality permeate, having a lower SDI value than permeate produced by simple one-stage dual media filtration pretreatment. The principal seawater components responsible for UF fouling was identified as organic matter released by planktonic organisms. Use of low dose pre-coagulation upstream of UF helped to control this fouling potential, resulting in steady state hydraulic conditions and a low cleaning frequency. The performance of RO membranes downstream of UF were evaluated under higher recovery and higher flux rate operating conditions, to address the differential cost of UF as compared to conventional pretreatment, enabling SWRO plant design having reduced operating expenses and increased ease of operation. Includes 12 references, tables, figures.
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发布单位或类别: 美国-美国给水工程协会
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