Yiqun Yao , Xudong Zhang , Ruoyu Wang , Shihong Lin , Tiezheng Tong
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引用次数: 0
摘要
高盐度盐水的管理是实现循环水经济的关键挑战。传统的盐水处理技术主要依靠热蒸发,这需要大量能源、成本和/或占地面积。最近开发的电解结晶(EDC)是一种无需蒸发即可实现盐水结晶的新型工艺。然而,矿物结垢和有机污垢对 EDC 性能的潜在影响尚未得到揭示。在本研究中,我们系统地研究了 EDC 中的矿物结垢和有机污垢。我们证明,尽管在腐植酸存在的情况下能耗会增加,但 EDC 的离子传输和结晶效率总体上不受各种矿物结垢剂和有机污垢的影响。此外,与反渗透相比,EDC 不易受石膏结垢的影响,这主要是由于这两种膜过程在浓度极化方面存在差异。为了在假定的 EDC-RO 处理过程中减轻石膏结垢,以实现零液体排放 (ZLD),采用了聚丙烯酸 (PAA) 作为反冲洗剂,以防止反冲洗过程中的石膏结垢,同时在相对较低的浓度下不会对 EDC 的性能产生不利影响。我们的研究揭示了 EDC 在处理具有高结垢和结垢潜能的给水时的行为,为了解矿物结垢和有机结垢提供了宝贵的见解,有助于应用基于 ED 的技术处理高盐度盐水以实现 ZLD。
Mineral scaling and organic fouling in electrodialytic crystallization
The management of hypersaline brine is a critical challenge to achieving a circular water economy. Traditional brine treatment technologies mainly rely on thermal evaporation, which requires intensive energy, cost, and/or areal footprint. Electrodialytic crystallization (EDC) has been recently developed as a novel process that enables brine crystallization without evaporation. However, the potential effects of mineral scaling and organic fouling on the performance of EDC have not been revealed. In this study, we systematically investigated mineral scaling and organic fouling in EDC. We demonstrate that the ion transport and crystallization efficiencies of EDC are generally unaffected by a variety of mineral scalants and organic foulants, despite an increase of energy consumption in the presence of humic acid. Further, EDC is shown to be less susceptible to gypsum scaling than RO, mainly due to the difference in concentration polarization between these two membrane processes. To mitigate gypsum scaling in an assumptive EDC-RO treatment train towards zero liquid discharge (ZLD), polyacrylic acid (PAA) is employed as an antiscalant that prevents gypsum scaling in RO while not adversely affecting EDC performance at relatively low concentration. Our study unravels the behaviors of EDC when treating feedwater with high scaling and fouling potentials, providing valuable insights for understanding mineral scaling and organic fouling when applying an ED-based technology for hypersaline brine treatment towards ZLD.
期刊介绍:
The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.