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Optimizing seawater operating protocols for pressurized ultrafiltration based on advanced cleaning research

机译：基于先进清洁研究优化加压超滤的海水操作规程

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This paper is part of a global research project conducted by Dow Water & Process Solutions to optimize the efficiency of ultrafiltration processes. After an initial identification of the backwash as the key opportunity to increase the efficiency of the process, a study based on its optimization is developed. Main emphasis is given to the sequence and subsequent number of steps involved in the backwash. The ultimate goal is thus to increase the availability and recovery of the process while still attaining a high cleaning effect during the backwash. This optimization is done through the realization of various experiments using DOW? Ultrafiltration SFP-2660 outside-in polyvinylidene difluoride (PVDF) membranes following an exhaustively planned factorial design of experiments. The factors being assessed are the steps normally performed during a backwash. These are the air scour (AS/D), the draining (D), the backwash top (BWT) with or without air scour, the backwash bottom (BWB) and the forward flush (FF). The responses analyzed are the calculated efficiency of the process and the experimentally obtained transmembrane pressure, which represents the fouling rate of the membrane. The results are analyzed through a formal statistical study of the analysis of the variance and are validated through 25 days of stable operation. The results show that the backwash can be simplified from an original sequence of five steps to only two steps, which are the backwash top with air scour and the forward flush without impairing the effectiveness of the cleanings. This leads to an increase in efficiency higher than 5%, which represents a decrease of 50% in the filtration inefficiency. This is achieved thanks to the reduction of the time invested for the cleanings and the decrease in the amount of water consumed.
机译：本文是陶氏水处理与工艺解决方案部进行的一项全球研究项目的一部分，旨在优化超滤过程的效率。在初步确定将反洗作为提高工艺效率的关键机会之后，进行了基于其优化的研究。主要强调反洗涉及的步骤顺序和后续数量。因此，最终目标是增加工艺的可用性和回收率，同时在反洗过程中仍能获得较高的清洁效果。通过使用DOW？实现各种实验来完成此优化。经过详尽规划的实验设计后，超滤SFP-2660外-内-聚偏二氟乙烯（PVDF）膜。评估的因素是反洗过程中通常执行的步骤。它们是空气冲刷（AS / D），排水（D），带或不带空气冲刷的反洗顶部（BWT），反洗底部（BWB）和正向冲洗（FF）。分析的响应是该过程的计算效率和实验获得的跨膜压力，该压力表示膜的结垢率。通过对方差分析的正式统计研究对结果进行分析，并通过25天的稳定运行进行验证。结果表明，反洗可以从原来的五个步骤简化为只有两个步骤，即带有空气冲刷功能的反洗顶部和向前冲洗，而不会损害清洁效果。这导致效率提高超过5％，这表示过滤效率降低了50％。这要归功于减少的清洁时间以及所消耗的水量的减少。

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