Li Yun, Xie Xiaomin, Yin Rongxiu, Dong Qingzhao, Wei Quanquan, Zhang Bangxi
College of Resource and Environment, Qingdao Agricultural University, Qingdao 266109, China.
School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China.
Membranes (Basel). 2022 Apr 28;12(5):476. doi: 10.3390/membranes12050476.
Biogas slurry poses a severe challenge to the sustainable management of livestock farms. The technology of the forward osmosis (FO) membrane has a good application prospect in the field of biogas slurry concentration. Further research is needed to verify the effects of different draw solutions on FO membranes in biogas slurry treatment and the related membrane fouling characteristics. In this study, three different draw solutions were selected to evaluate the performance of FO membranes for biogas slurry concentration. Membrane fouling was investigated by characterization after FO membrane treatment to identify fouling contaminants. The result showed that FO membrane treatment can realize the concentration of biogas slurry and MgCl as the draw solution has the best effect on the concentration of biogas slurry. The different draw solutions all contributed to the efficient retention of most organics and TP while each treatment was ineffective at retaining nitrogen. The cake layer that appeared after the biogas slurry was concentrated covered the surface of the FO membrane. Some functional groups were detected on the surface after membrane fouling, such as C-O and C=C. Moreover, the C element accounts for 57% of the main components of the cake layer after the membrane fouling. Membrane fouling is caused by both organic fouling and inorganic fouling, of which organic fouling is the main reason. This study provides a technical reference for the high-value utilization of biogas slurry.
沼液给养殖场的可持续管理带来了严峻挑战。正向渗透（FO）膜技术在沼液浓缩领域具有良好的应用前景。需要进一步研究以验证不同汲取液对沼液处理中FO膜的影响以及相关的膜污染特性。在本研究中，选择了三种不同的汲取液来评估FO膜对沼液浓缩的性能。通过对FO膜处理后的表征来研究膜污染，以识别污染污染物。结果表明，FO膜处理能够实现沼液的浓缩，且以MgCl作为汲取液对沼液浓缩效果最佳。不同的汲取液都有助于高效截留大多数有机物和总磷，而每种处理在截留氮方面均无效。沼液浓缩后出现的滤饼层覆盖了FO膜的表面。膜污染后在表面检测到一些官能团，如C-O和C=C。此外，膜污染后滤饼层的主要成分中C元素占57%。膜污染是由有机污染和无机污染共同引起的，其中有机污染是主要原因。本研究为沼液的高值化利用提供了技术参考。
