Yang Bo, Jia Li-Juan, Xu Hui, Li Fang, Liu Yan-Biao
State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Shanghai 201620, China.
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
Huan Jing Ke Xue. 2020 Apr 8;41(4):1816-1824. doi: 10.13227/j.hjkx.201910019.
The addition of conductive materials or metal oxide nanoparticles to an anaerobic system is an attractive strategy to enhance anaerobic digestion. The effect of granular activated carbon (GAC) and/or manganese dioxide (MnO) on waste activated sludge (WAS) anaerobic digestion was investigated by batch experiments. The experiments were provided in control, GAC, MnO, and GAC/MnO groups, which were named R0, R1, R2, and R3, respectively. The sludge characteristics, microbial activity, and microbial community structure were systematically investigated. Results showed that CH yield rate was evidently increased by 68.18% and 51.35% in R1 and R3, respectively, whereas the cumulative CH production decreased by 21.25% in R2, compared with R0. Moreover, the fermentation process could be promoted with the addition of GAC and/or MnO. The phosphate precipitation generated by Mn and phosphate released from WAS blocked the anaerobic metabolic channel and then decreased the production of CH in R2. The increase in CH yield rate in R3 was mainly attributed to the conductivity and adsorption of GAC and the catalysis of MnO. Additionally, the microbial activity could be promoted with the addition of GAC, MnO, and GAC/MnO in anaerobic digestion. Microbial community structure analysis showed that the abundance of the and increased with the addition of GAC and MnO, which could enhance the interspecies electron transfer between fermenting bacteria and methanogens and boost fermentation and CH production.
向厌氧系统中添加导电材料或金属氧化物纳米颗粒是增强厌氧消化的一种有吸引力的策略。通过批次实验研究了颗粒活性炭（GAC）和/或二氧化锰（MnO）对剩余活性污泥（WAS）厌氧消化的影响。实验设置了对照组、GAC组、MnO组和GAC/MnO组，分别命名为R0、R1、R2和R3。系统研究了污泥特性、微生物活性和微生物群落结构。结果表明，与R0相比，R1和R3的CH产率分别显著提高了68.18%和51.35%，而R2的CH累计产量下降了21.25%。此外，添加GAC和/或MnO可以促进发酵过程。Mn产生的磷酸盐沉淀和WAS释放的磷酸盐堵塞了厌氧代谢通道，进而降低了R2中CH的产量。R3中CH产率的提高主要归因于GAC的导电性和吸附性以及MnO的催化作用。此外，在厌氧消化中添加GAC、MnO和GAC/MnO可以促进微生物活性。微生物群落结构分析表明，添加GAC和MnO后， 和 的丰度增加，这可以增强发酵细菌和产甲烷菌之间的种间电子传递，促进发酵和CH的产生。
