Kong Fanying, Ren Hong-Yu, Liu Dong, Wang Zilong, Nan Jun, Ren Nan-Qi, Fu Qiang
School of Water Conservancy and Civil Engineering, Northeast Agricultural University, Harbin 150030, China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Bioresour Technol. 2022 Jun;353:127147. doi: 10.1016/j.biortech.2022.127147. Epub 2022 Apr 11.
In this study, a stacked integrated system with anaerobic bioelectrochemical system (BES) and aerobic moving bed biofilm reactor (MBBR) was developed to improve the decolorization and mineralization of azo dye. This stacked BES-MBBR exhibited better performance with acid orange (AO7) decolorization of 96.4 ± 0.6% and chemical oxygen demand (COD) removal of 87.7 ± 4.4%. Contribution of each module in the BES and MBBR stages indicated that BES modules enhanced the pretreatment process in AO7 decolorization, and MBBR played an important role in further removal of COD. The mechanism analysis indicated that the azo bond was cleaved with reductive decolorization at biocathode in the anaerobic BES stages, and then the intermediate products can be further oxidized with COD removal in the aerobic MBBR stage. This work demonstrated that the integrated system with stacked anaerobic BES and aerobic MBBR could provide a promising way for the pretreatment and post-treatment of refractory wastewater.
在本研究中，开发了一种由厌氧生物电化学系统（BES）和好氧移动床生物膜反应器（MBBR）组成的堆叠式集成系统，以提高偶氮染料的脱色和矿化效果。这种堆叠式BES-MBBR表现出更好的性能，酸性橙（AO7）脱色率为96.4±0.6%，化学需氧量（COD）去除率为87.7±4.4%。BES和MBBR阶段各模块的贡献表明，BES模块增强了AO7脱色的预处理过程，而MBBR在进一步去除COD方面发挥了重要作用。机理分析表明，在厌氧BES阶段，偶氮键在生物阴极通过还原脱色被裂解，然后中间产物在好氧MBBR阶段可被进一步氧化以去除COD。这项工作表明，堆叠式厌氧BES和好氧MBBR的集成系统可为难处理废水的预处理和后处理提供一种有前景的方法。
