Tomczak Wirginia, Gryta Marek
Faculty of Chemical Technology and Engineering, Bydgoszcz University of Science and Technology, 3 Seminaryjna Street, 85-326 Bydgoszcz, Poland.
Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, ul. Pułaskiego 10, 70-322 Szczecin, Poland.
Materials (Basel). 2023 Feb 16;16(4):1673. doi: 10.3390/ma16041673.
The past decade has seen a rise in the importance of the ultrafiltration (UF) technique in the separation of various complex solutions. However, the fouling phenomenon is the main limitation to faster process development. To the best of the authors' knowledge, the present paper is the first to aim to identify the role of corrosion fouling in long-term UF. For this purpose, polyvinylidene fluoride (PVDF) and polyethersulfone (PES) membranes were used. The investigations were carried out with the use of both pilot-scale and laboratory-scale units. Results obtained in the present study have clearly demonstrated that the oil concentration has a significant impact on the process performance. Indeed, it has been noted that a reduction in oil concentration from 160 to 100 mg/L resulted in an increase in the PVDF membrane flux from 57 to 77 L/mh. In addition, it has been shown that the feed temperature has a significant influence on the UF performance. Importantly, it has been shown that corrosion fouling is of vital importance in UF membranes. Indeed, corrosion products such as iron oxides contaminated the membrane surface leading to an irreversible decrease in the UF process performance. In addition, it has been found that repeating the chemical cleaning of the membrane units significantly reduced the intensity of the fouling phenomenon. However, the complete elimination of its effects was not achieved. Therefore, it has been indicated that cleaning agents recommended by membrane manufacturers do not remove corrosion products deposited on the membrane surface. Undoubtedly, the obtained results can be used in the design of UF units leading to the extension of membrane installation lifetime.
在过去十年中，超滤（UF）技术在各种复杂溶液分离中的重要性日益凸显。然而，污染现象是阻碍该工艺更快发展的主要限制因素。据作者所知，本文首次旨在确定腐蚀污染在长期超滤过程中的作用。为此，使用了聚偏氟乙烯（PVDF）和聚醚砜（PES）膜。研究在中试规模和实验室规模的装置上进行。本研究获得的结果清楚地表明，油浓度对工艺性能有显著影响。事实上，已经注意到油浓度从160毫克/升降至100毫克/升时，PVDF膜通量从57升/小时增加到77升/小时。此外，研究表明进料温度对超滤性能有显著影响。重要的是，研究表明腐蚀污染对超滤膜至关重要。事实上，诸如氧化铁之类的腐蚀产物污染了膜表面，导致超滤工艺性能出现不可逆的下降。此外，还发现重复对膜装置进行化学清洗可显著降低污染现象的强度。然而，其影响并未完全消除。因此，已表明膜制造商推荐的清洗剂无法去除沉积在膜表面的腐蚀产物。毫无疑问，所获得的结果可用于超滤装置的设计，从而延长膜装置的使用寿命。
