Enhancement Effects and Mechanisms of Microscale Zero Valent Iron on the Performance of Anaerobic Co-digestion of Waste Activated Sludge and Food Waste

被引：3
|
作者：
Chen S.-J. [1 ,2 ]
Yao F.-B. [1 ,2 ]
Pi Z.-J. [1 ,2 ]
Hou K.-J. [1 ,2 ]
He L. [1 ,2 ]
Li X.-M. [1 ,2 ]
Wang D.-B. [1 ,2 ]
Yang Q. [1 ,2 ]
机构：
[1] College of Environmental Science and Engineering, Hunan University, Changsha
[2] Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha
来源：
Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 02期
关键词：
Anaerobic co-digestion; Direct interspecies electron transfer (DIET); Food waste; Microbial community; Microscale zero valent iron (mZVI); Waste activated sludge;
D O I：
10.13227/j.hjkx.202007035
中图分类号：
学科分类号：
摘要：
Focusing on low biogas yields in the anaerobic co-digestion of waste activated sludge and food waste, the enhancing effects and mechanisms of microscale zero valent iron (mZVI) on anaerobic co-digestion was investigated. The results indicated that the addition of mZVI enhanced the methanogenesis stage of co-digestion but had no significant effect on the solubilization, hydrolysis, and acidification stages. With a dosage of 10 g•L-1 mZVI, the cumulative methane yield (based on VS) within 15 days reached 238.68 mL•g-1, which was 20.05% higher than the control group. The mechanism analysis showed that mZVI promoted electron transport system (ETS) activity (based on INTF/TS), which increased to 21.50 mg•(g•h)-1 with 10 g•L-1 mZVI compared to 13.43 mg•(g•h)-1 in the control group. Furthermore, mZVI enhanced direct interspecies electron transfer (DIET) between specific bacteria and methanogens. Microbial community analysis demonstrated that the abundance of DIET-related microorganisms, such as Syntrophomonas, Methanosarcina, and Methanobacterium, was higher in presence of mZVI. © 2021, Science Press. All right reserved.
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页码：891 / 899
页数：8
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