Integrated pore blockage-cake filtration model for crossflow filtration

Crossflow filtration is to be a key process in the treatment and disposal of approximately 60,000 metric tons of high-level radioactive waste stored at the Hanford Site in Richland, Washington. Pacific Northwest National Laboratory is assessing filter performance with waste simulant materials that mimic the chemical and physical properties of Hanford tank waste. Prior simulant studies indicated that waste filtration performance may be limited by pore and cake fouling. To limit the shutdown of waste treatment operations, the pre-treatment facility plans to recover filter flux losses from cake formation and filter fouling by frequently backpulsing the filter elements. The objective of the current paper is to develop a simple model of flux decline resulting from cake and pore fouling and potential flux recovery through backpulsing of the filters for Hanford waste filtration operations. To this end, a model capable of characterizing the decline in waste simulant filter flux as a function of both irreversible pore blockage and reversible cake formation is proposed. This model is used to characterize the filtration behavior of Hanford waste simulants in both continuous and backpulsed operations. The model is then used to infer the optimal backpulse frequency under specific operating conditions.     

过滤理论研究与过滤实践中的几个问题

对过滤理论研究的进展情况进行了较系统的介绍与分析 ,并就工业生产中存在的问题提出了看法。     

高剪切错流过滤

与传统的低剪切错流过滤相比，高剪切错流过滤具有提高透过液通量、大大减少停车清洗或更换膜的频度、无需使用絮凝剂或破乳剂等优点，具有广泛的应用前景。本文介绍了高剪切错流过滤的概念、方法及应用实例。