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Development of Alternative Membrane Integrity Detection Tools for Low Pressure Membranes Treating Filter Backwash Water 用于处理过滤器反冲洗水的低压膜的替代膜完整性检测工具的开发
发布日期: 2005-11-01
快速识别膜过程中的漏洞或系统突破的能力 确保持续供应优质水和遵守饮用水标准至关重要 指导方针和条例。直接完整性方法,如压力衰减和气泡 点测试能够识别和隔离膜内的完整性破坏 操作系统。然而,这些测试的间歇性并不能提供实时性 有关膜操作系统性能的信息。因此,整合 在运行期间,需要对膜渗透流进行连续间接完整性监测 根据美国环境保护局(USEPA)膜过滤指南的建议指南推荐 手动,如浊度计和颗粒计数器。膜下操作 条件,如高天然有机物(NOM)源水或过滤反冲洗水(FBWW)的处理 这些监测工具在探测初始系统突破时的灵敏度 由溶解物质(例如,NOM、金属)的慢性增加定义可能不是最优的。 因此,本研究调查的目的是评估间接诚信 中试规模超滤(UF)膜处理FBWW的试验方法。间接完整性测试 在一个故意破坏的系统上对方法进行评估,以确定 这些监测程序检测单个光纤针孔的能力。最重要的两个 常用的间接完整性程序,即颗粒计数和浊度 对膜渗透液进行的测量未能检测出膜中产生的故意破裂 膜操作系统。然而,溶解有机碳(DOC)和颜色 测量结果表明,这些替代性间接测试程序的能力很有希望 确定环境中溶解污染物浓度的显著增加 渗透到溪流中。包括4个参考文献,表1。
The ability to quickly identify breaches or system breakthrough within the membrane process is critical to ensure the consistent supply of high quality water and compliance with drinking water guidelines and regulations. Direct integrity methodologies such as pressure decay and bubble point tests are capable of identifying and isolating integrity breaches within a membrane operating system. However, the intermittent nature of these tests does not provide real-time information as to the performance of a membrane operating system. Therefore, the integration of continuous indirect integrity monitoring of membrane permeate streams during operation is recommended within the proposed guidelines of the US Environmental Protection Agency (USEPA) Membrane Filtration Guidance Manual, such as turbidity meters and particle counters. Under challenged membrane operating conditions, such as the treatment of high natural organic matter (NOM) source water or filter backwash water (FBWW) applications, the sensitivity of these monitoring tools in detecting initial system breakthrough as defined by chronic increases in dissolved material (e.g., NOM, metals) may not be optimal. Therefore, the purpose of the present research investigation was to evaluate indirect integrity testing methodologies on a pilot-scale ultrafiltration (UF) membrane treating FBWW. Indirect integrity test methodologies were evaluated on an intentionally compromised system to determine the capabilities of these monitoring procedures in detecting individual fiber pinholes. The two most commonly employed indirect integrity procedures, namely particle counting and turbidity measurements on the membrane permeate failed to detect the intentional breach created in the membrane operating system. However, dissolved organic carbon (DOC) and color measurements showed promising results in the ability of these alternative indirect test procedures to identify significant increases in the concentration of dissolved contaminants within the permeate stream. Includes 4 references, table.
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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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