School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China; State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin, 300387, China.
State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin, 300387, China; School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin, 300387, China.
Water Res. 2019 Feb 1;149:215-224. doi: 10.1016/j.watres.2018.10.091. Epub 2018 Nov 2.
In this study, a novel manner of bio-electric field (BEF) which generated by upflow anaerobic sludge blanket (UASB)-microbial fuel cell (MFC) integrated system facilitated iron-carbon micro-electrolysis in blast furnace dusting ash (BFDA) was proposed for the reinforcement of anaerobic digestion in UASB. The responses of COD removal efficiency and biogas production with (0.1-0.4 V) BEF catalyzed 5 g BFDA(R) were much higher than the other tests, and maximum reached 86% and 240 ml/d respectively. Ultra-fast acidogenesis was achieved with 0.3 V BEF supplied to BFDA and the time shortened 94 h compared controlled (R) with R. With the electrochemical and microbial community analysis, the redox ability and direct interspecies electron transfer accumulated with BEF catalyzed. The abundance of Firmicutes which could generate bio-hydrogen was highest in R (44.58%) compared to R (31.36%) and R (40.04%). In addition, the structure and morphology variation of BFDA revealed that the synergistic effects of BEF stimulated iron-carbon micro-electrolysis for electron transferring and enhanced the activities of methanogens and acetogens with high relative abundance to biotransform organic compounds, as well as adsorption and precipitation of iron oxides (hematite and magnetite) promoting anaerobic digestion. The MFC-BFDA-UASB integrated system provides a promising and cost-effective way to enhance anaerobic digestion and recycled functionalized waste effectively.
在这项研究中，提出了一种新型生物电场 (BEF) 方式，该方式由上流式厌氧污泥床 (UASB)-微生物燃料电池 (MFC) 集成系统产生，可促进高炉粉尘灰 (BFDA) 中的铁碳微电解，从而增强 UASB 中的厌氧消化。与其他测试相比，施加 (0.1-0.4 V) BEF 催化 5 g BFDA(R)时，COD 去除效率和沼气产量的响应要高得多，分别达到 86%和 240 ml/d。施加 0.3 V BEF 可实现超快产酸，与对照 (R) 相比，时间缩短了 94 h。通过电化学和微生物群落分析，BEF 催化下积累了氧化还原能力和直接种间电子转移。与 R (31.36%)和 R (40.04%)相比，R 中生成生物氢的Firmicutes 丰度最高 (44.58%)。此外，BFDA 的结构和形态变化表明，BEF 的协同作用刺激了铁碳微电解的电子传递，并增强了相对丰度较高的产甲烷菌和产乙酸菌的活性，使其能够将有机化合物进行生物转化，同时铁氧化物（赤铁矿和磁铁矿）的吸附和沉淀也促进了厌氧消化。MFC-BFDA-UASB 集成系统为增强厌氧消化和有效回收功能化废物提供了一种有前途且具有成本效益的方法。
