Zhang Bangxi, Fu Tianhong, Zhang Qinyu, Wang Xiaomin, Tang Ling, Wei Quanquan, Li Yun, Peng Yutao
Institute of Agricultural Resources and Environment, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China.
School of Pharmacy, Zunyi Medical University, Zunyi 563006, China.
Membranes (Basel). 2023 Feb 28;13(3):288. doi: 10.3390/membranes13030288.
Forward osmosis membrane technology (FO) shows potential application prospects in biogas slurry concentration, which is conducive to promoting the sustainable development of biogas projects. However, at present, the key influencing factors of membrane concentration using FO are not well understood. Therefore, this study analyzed the influence of draw solution concentration, pH, temperature and cross-flow velocity on the concentration efficiency of FO membrane, and optimized the operation parameters of FO membrane. The results showed that the concentration effect of the NaCl draw solution at pH 5 or 9 was better than that at pH 7. The order of factor influencing the water flux was as follows: draw liquid concentration > cross-flow velocity > operating temperature. The optimal combination obtained by orthogonal analysis was under 45 °C, with a cross-flow velocity of 1 L/min and the use of 1.5 mol/L NaCl as draw solution. The results of the membrane cleaning implied that the recovery rate of the fouled membrane after acid-base cleaning is significantly higher (88%) than other cleaning solutions. This research offers a scientific reference for applying positive osmosis technology to re-utilize biogas slurry resources.
正向渗透膜技术（FO）在沼液浓缩方面展现出潜在的应用前景，这有利于推动沼气工程的可持续发展。然而，目前对于采用FO进行膜浓缩的关键影响因素尚未完全明晰。因此，本研究分析了汲取液浓度、pH值、温度和错流速度对FO膜浓缩效率的影响，并对FO膜的运行参数进行了优化。结果表明，pH值为5或9时NaCl汲取液的浓缩效果优于pH值为7时。影响水通量的因素顺序如下：汲取液浓度＞错流速度＞操作温度。通过正交分析得到的最佳组合为：45℃、错流速度1L/min以及使用1.5mol/L NaCl作为汲取液。膜清洗结果表明，酸碱清洗后污堵膜的回收率显著更高（88%），高于其他清洗液。本研究为应用正渗透技术重新利用沼液资源提供了科学参考。
