Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
Sci Total Environ. 2018 Jul 1;628-629:261-270. doi: 10.1016/j.scitotenv.2018.02.043. Epub 2018 Feb 13.
Some refractory organic matters or soluble microbial products remained in the effluents of refractory organic wastewater after biological secondary treatment and need an advanced treatment before final disposal. Graphene oxide (GO) was known to have potential to be the next generation membrane material. The functional organics/inorganic salts separation GO membrane preparation and application in wastewater advanced treatment could reduce energy or chemicals consumption and avoid organics/inorganic salts mixed concentrate waste problems after nanofiltration or reverse osmosis. In this study, we developed a novelty GO membrane aiming at advanced purification of organic matters in the secondary effluents of refractory organic wastewater and avoiding the organics/inorganic salts mixed concentrate waste problem. The influence of preparation conditions including pore size of support membrane, the number of GO layers and the applied pressure was investigated. It was found that for organics/inorganic salts mixture separation membrane preparation, the rejection and flux would achieve balance for the support membrane at a pore size of 0.1μm and the number of GO layers of has an optimization value (10 layers). A higher assemble pressure (~10bar) contributed to the acquisition of a higher rejection efficiency and lower roughness membrane. This as prepared GO membrane was applied to practical secondary effluent of a chemical synthesis pharmaceuticals wastewater. A good organic matter rejection efficiency (76%) and limited salt separation (<14%) was finally obtained. These results can promote the practical application of GO membrane and the resourcelized treatment of industrial wastewater.
一些难生物降解的有机物质或可溶解性微生物产物仍然存在于难生物降解有机废水的生物二级处理出水中，在最终处置之前需要进行高级处理。氧化石墨烯（GO）有望成为下一代膜材料。功能有机/无机盐分离的 GO 膜制备及其在废水高级处理中的应用，可以降低纳滤或反渗透后能源或化学品的消耗，并避免有机/无机盐混合浓缩废物问题。在这项研究中，我们开发了一种新型 GO 膜，旨在对难生物降解有机废水的二级出水中的有机物进行高级净化，并避免有机/无机盐混合浓缩废物问题。研究考察了制备条件（支撑膜的孔径、GO 层数和施加压力）的影响。结果表明，对于有机/无机盐混合物分离膜的制备，支撑膜的孔径为0.1μm，GO 层数具有优化值（10 层）时，截留率和通量会达到平衡。较高的组装压力（~10bar）有助于获得更高的截留效率和更低粗糙度的膜。将所制备的 GO 膜应用于化学合成制药废水的实际二级出水中，最终获得了良好的有机物去除效率（76%）和有限的盐分离（<14%）。这些结果可以促进 GO 膜的实际应用和工业废水的资源化处理。
