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.

引用

页码：891 / 899

页数：8

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