Enhanced biogas biological upgrading from kitchen wastewater by in-situ hydrogen supply through nano zero-valent iron corrosion

Jieyu Tang; Ziyi Liu; Mingxing Zhao; Hengfeng Miao; Wansheng Shi; Zhenxing Huang; Lijuan Xie; Wenquan Ruan

doi:10.1016/j.jenvman.2022.114774

Enhanced biogas biological upgrading from kitchen wastewater by in-situ hydrogen supply through nano zero-valent iron corrosion

J Environ Manage. 2022 May 15:310:114774. doi: 10.1016/j.jenvman.2022.114774. Epub 2022 Feb 23.

Authors

Jieyu Tang¹, Ziyi Liu², Mingxing Zhao³, Hengfeng Miao¹, Wansheng Shi⁴, Zhenxing Huang⁵, Lijuan Xie¹, Wenquan Ruan⁴

Affiliations

¹ School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China; Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi, 214122, China.
² Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK.
³ School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China; Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi, 214122, China. Electronic address: mxzhao@jiangnan.edu.cn.
⁴ School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China; Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, 214122, China.
⁵ School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China; Jiangsu Collaborative Innovation Center of Water Treatment Technology & Material, Suzhou, 215009, China.

PMID: 35219211
DOI: 10.1016/j.jenvman.2022.114774

Abstract

The in-situ hydrogen supply by nano zero-valent iron (nZVI, nFe⁰) corrosion provided a feasible way to improve the efficiency of biogas biological upgrading. This work studied the effects of nZVI at different dosages (0, 2, 4, 6, 8 and 10 g/L) on anaerobic digestion of kitchen wastewater by two buffer systems 2-[4-(2-hydroxyethyl) piperazin-1-yl] ethanesulfonic acid (HEPES) and sodium hydrogen carbonate (NaHCO₃). The addition of nZVI improved the content of methane (CH₄) and stability of anaerobic digestion process. In HEPES buffer system, the CH₄ was all increased and the maximum reached 90.51% with 10 g/L nZVI, higher than 32.25% compared to the control. The maximum hydrogen enrichment (HE) was 113 ppb after nZVI addition, indicating the mass transfer efficiency of hydrogen (H₂) was improved. Microbial community analysis showed that the total relative abundance of Methanobacterium and Methanolinea at 10 g/L nZVI was 53.72%, which was 1.62 times of the control group. However, in the NaHCO₃ buffer system with 10 g/L nZVI addition, the content of CH₄ and the loosely bound extracellular polymeric substances (LB-EPS) was lower than the control. The results indicated that the addition of nZVI was feasible for biogas upgrading, and the bidirectional effect of nZVI on the promotion or inhibition of bio-methanation might be related to the buffer system of the anaerobic process.

Keywords: Anaerobic digestion; HEPES; In-situ hydrogen supply; Methane; NaHCO(3); Nano zero-valent iron.

MeSH terms

Anaerobiosis
Biofuels* / analysis
Corrosion
Hydrogen
Iron
Methane / metabolism
Sewage / microbiology
Wastewater*

Substances

Biofuels
Sewage
Waste Water
Hydrogen
Iron
Methane