Effects of cold temperature and chemical cleaning on performance, membrane fouling and its control in drinking water membrane filtration

低温和化学清洗对饮用水膜过滤性能、膜污染及其控制的影响

• 批准号: 476874-2014
• 负责人: Liao, Baoqiang
• 金额: $ 3.34万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=578759
• 关键词: Effects; cold; temperature; chemical; cleaning

Membrane filtration technology has been widely used for drinking water production all over the world, due to its advantages in better removal of contaminants, high efficiency, small footprint, easy operation, long filtration life, and superior quality of drinking water-free of solids, pathogens, virus and bacteria. However, temperature is a significant factor that affects the performance of membrane filtration. The geographical locations of Canada lead to months of cold temperature each year for many municipalities. The cold temperature has dramatically negative influence on membrane filtration in drinking water production. Each year, thousands of dollars are wasted in each membrane filtration plant in the form of membrane replacements, due to poor operation and membrane cleaning, and membrane structure deterioration in cold temperature. Furthermore, chemical cleanings are routinely used for membrane fouling control. Some of the widely used chemical cleaning agents, such as sodium hypochlorite, have significantly negative impact on membrane structure and thus cause membrane aging and reduce membrane lifespan. Thus, finding replacements for these cleaning agents are highly desirable. The proposed study will develop an improved fundamental understanding of the effect of cold temperature and chemical cleaning on membrane performance, fouling and its control, and membrane structure by conducting bench-, pilot-, and full-scale studies. New operating and membrane cleaning strategies will be developed to optimize the performance of drinking water membrane filtration plants in cold regions in Canada. The findings from this study will help drinking water membrane filtration plants to maximize productivity, minimize membrane fouling, reduce chemical usage and operating costs, and extend membrane lifespan.

膜过滤技术具有去除污染物效果好、效率高、占地面积小、操作方便、过滤寿命长、无固体、无病原体、无病毒、无细菌等优点，在世界各地的饮用水生产中得到了广泛应用。而温度是影响膜过滤性能的重要因素。加拿大的地理位置导致许多城市每年都有几个月的低温。在饮用水生产中，低温对膜过滤有显著的负面影响。每年，由于操作和膜清洗不良，以及低温下膜结构恶化，每个膜过滤装置以换膜的形式浪费了数千美元。此外，化学清洗通常用于膜污染控制。一些广泛使用的化学清洗剂，如次氯酸钠，对膜结构有明显的负面影响，从而导致膜老化，降低膜寿命。因此，寻找这些清洁剂的替代品是非常可取的。该研究将通过实验、中试和全面研究，对低温和化学清洗对膜性能、污染及其控制和膜结构的影响有更深入的了解。将开发新的操作和膜清洁策略，以优化加拿大寒冷地区饮用水膜过滤厂的性能。本研究结果将有助于饮用水膜过滤厂提高生产效率，减少膜污染，减少化学品的使用和运营成本，延长膜的使用寿命。