Institute of Environmental Research at Greater Bay, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, China.
Shandong Key Laboratory of Water pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Qingdao 266237, China.
J Hazard Mater. 2023 Sep 5;457:131744. doi: 10.1016/j.jhazmat.2023.131744. Epub 2023 May 30.
High energy consumption is impedimental for eliminating refractory organics in wastewater by current technologies. Herein, we develop an efficient self-purification process for actual non-biodegradable dyeing wastewater at pilot scale, using N-doped graphene-like (CN) complexed Cu-AlO supported AlO ceramics (HCLL-S8-M) fixed-bed reactor without additional input. About 36% chemical oxygen demand removal was achieved within 20 min empty bed retention time and maintained stability for almost one year. The HCLL-S8-M structure feature and its interface on microbial community structure, functions, and metabolic pathways were analyzed by density-functional theory calculation, X-ray photoelectron spectroscopy, multiomics analysis of metagenome, macrotranscriptome and macroproteome. On the surface of HCLL-S8-M, a strong microelectronic field (MEF) was formed by the electron-rich/poor area due to Cu-π interaction from the complexation between phenolic hydroxy of CN and Cu species, driving the electrons of the adsorbed dye pollutants to the microorganisms through extracellular polymeric substance and the direct transfer of extracellular electrons, causing their degradation into CO and intermediates, which was degraded partly via intracellular metabolism. The lower energy feeding for the microbiome produced less adenosine triphosphate, resulting in little sludge throughout reaction. The MEF from electronic polarization is greatly potential to develop low-energy wastewater treatment technology.
高能耗阻碍了当前技术对废水中难降解有机物的去除。在此，我们在中试规模下开发了一种用于实际难生物降解染色废水的高效自净化工艺，使用氮掺杂类石墨烯（CN）复合 Cu-AlO 负载 AlO 陶瓷（HCLL-S8-M）固定床反应器，无需额外投入。在 20 分钟空床保留时间内，约 36%的化学需氧量被去除，并且在近一年的时间内保持稳定。通过密度泛函理论计算、X 射线光电子能谱、宏基因组、宏转录组和宏蛋白质组的多组学分析，研究了 HCLL-S8-M 的结构特征及其对微生物群落结构、功能和代谢途径的界面作用。在 HCLL-S8-M 表面，由于 CN 与 Cu 物种之间的配合作用导致的酚羟基的 Cu-π 相互作用，形成了富电子/缺电子区域的强微观电子场（MEF），通过细胞外聚合物和细胞外电子的直接转移，将吸附染料污染物的电子驱动到微生物中，导致其降解为 CO 和中间产物，部分通过细胞内代谢降解。微生物组的低能量供应产生较少的三磷酸腺苷，导致整个反应过程中污泥量很少。电子极化产生的 MEF 很有潜力开发低能耗废水处理技术。
