Tomczak Wirginia, Gryta Marek
Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, ul. Pułaskiego 10, 70-322 Szczecin, Poland.
CEA, DEN/DEC, 13108 Saint-Paul-lez-Durance, France.
Membranes (Basel). 2020 Oct 30;10(11):319. doi: 10.3390/membranes10110319.
This work examined the use of a ceramic fine ultrafiltration (UF) membrane for the pre-treatment of 1,3-propanodiol (1,3-PD) fermentation broths. It has been demonstrated that the membrane used provides obtaining a high-quality, sterile permeate, which can be sequentially separated by other processes such as nanofiltration (NF) and membrane distillation (MD). Special attention was paid to the impact of the operational parameters on the membrane performance. The series of UF experiments under transmembrane pressure (TMP) from 0.1 to 0.4 MPa and feed flow rate (Q) from 200 to 400 dm/h were performed. Moreover, the impact of the feed pH, in the range from 5 to 10, on the flux was investigated. It has been demonstrated that for fine UF, increasing the TMP is beneficial, and TMP equal to 0.4 MPa and Q of 400 dm/h ensure the highest flux and its long-term stability. It has been shown that in terms of process efficiency, the most favorable pH of the broths is equal to 9.4. An effective and simple method of membrane cleaning was presented. Finally, the resistance-in-series model was applied to describe resistances that cause flux decline. Results obtained in this study can assist in improving the cost-effectiveness of the UF process of 1,3-PD fermentation broths.
本研究考察了陶瓷微滤超滤（UF）膜用于1,3 - 丙二醇（1,3 - PD）发酵液预处理的情况。结果表明，所使用的膜能够获得高质量的无菌渗透液，该渗透液可通过纳滤（NF）和膜蒸馏（MD）等其他工艺依次分离。特别关注了操作参数对膜性能的影响。进行了一系列超滤实验，跨膜压力（TMP）范围为0.1至0.4 MPa，进料流速（Q）范围为200至400 dm³/h。此外，还研究了进料pH值在5至10范围内对通量的影响。结果表明，对于微滤超滤而言，提高跨膜压力是有益的，跨膜压力等于0.4 MPa且进料流速为400 dm³/h可确保最高通量及其长期稳定性。结果表明，就工艺效率而言，发酵液最适宜的pH值为9.4。提出了一种有效且简单的膜清洗方法。最后，应用串联阻力模型来描述导致通量下降的阻力。本研究所得结果有助于提高1,3 - PD发酵液超滤过程的成本效益。
