Marmara University, Environmental Engineering Department, 34722 Goztepe, Istanbul, Turkey.
Waste Manag. 2014 Jul;34(7):1171-8. doi: 10.1016/j.wasman.2014.01.020. Epub 2014 Feb 22.
Volatile fatty acid (VFA) separation from synthetic VFA solutions and leachate was investigated via the use of a membrane contactor. NaOH was used as a stripping solution to provide constant concentration gradient of VFAs in both sides of a membrane. Mass flux (12.23 g/m(2)h) and selectivity (1.599) observed for acetic acid were significantly higher than those reported in the literature and were observed at feed pH of 3.0, flow rate of 31.5 ± 0.9 mL/min, and stripping solution concentration of 1.0 N. This study revealed that the flow rate, stripping solution strength, and feed pH affect the mass transfer of VFAs through the PTFE membrane. Acetic and propionic acid separation performances observed in the present study provided a cost effective and environmental alternative due to elimination of the use of extractants.
采用膜接触器从合成 VFA 溶液和渗滤液中分离挥发性脂肪酸（VFA）。NaOH 用作汽提液，在膜两侧提供 VFA 的恒定浓度梯度。在进料 pH 值为 3.0、流速为 31.5±0.9mL/min 和汽提液浓度为 1.0N 的条件下，观察到乙酸的质量通量（12.23g/m(2)h）和选择性（1.599）明显高于文献报道的值。本研究表明，流速、汽提液强度和进料 pH 值会影响 VFA 通过 PTFE 膜的传质。由于无需使用萃取剂，本研究中观察到的乙酸和丙酸的分离性能提供了一种具有成本效益和环保的替代方案。
