NanoFe3O4 accelerates methanogenic straw degradation by improving energy metabolism

Cunpu Qiu; Youzhi Feng; Meng Wu; Ming Liu; Weitao Li; Zhongpei Li

doi:10.1016/j.biortech.2019.121930

NanoFe₃O₄ accelerates methanogenic straw degradation by improving energy metabolism

Bioresour Technol. 2019 Nov:292:121930. doi: 10.1016/j.biortech.2019.121930. Epub 2019 Jul 30.

Authors

Cunpu Qiu¹, Youzhi Feng¹, Meng Wu¹, Ming Liu¹, Weitao Li², Zhongpei Li³

Affiliations

¹ State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, Jiangsu Province, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China.
² State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, Jiangsu Province, PR China.
³ State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, Jiangsu Province, PR China; University of the Chinese Academy of Sciences, Beijing 100049, PR China. Electronic address: zhpli@issas.ac.cn.

PMID: 31401356
DOI: 10.1016/j.biortech.2019.121930

Abstract

The impacts of nanoFe₃O₄ on the composition of degradation products, microbial community, and microbial metabolic functions during rice straw anaerobic degradation were investigated. Under nanoFe₃O₄ addition, CH₄ production and straw degradation increased by 81% and 10.4%, respectively, in paddy soil enrichment. Coupling product chemistry and microbial community during straw degradation found that nanoFe₃O₄ effectively promoted the hydrolysis-acidification-methanogenesis of straw, which made lignin-, lipid-, protein-, tannin-like and VFAs products rapidly increase and then quickly decrease. Moreover, the relative abundance of Clostridiaceae and Methanosarcina corresponded with increased hydrolysis and acetoclastic methanogenesis with nanoFe₃O₄ addition. Cellular processes, environmental information processing and metabolism, especially energy metabolism, were enhanced functions of the microbial community during straw degradation with nanoFe₃O₄. The nanoFe₃O₄ addition may improve the electron transfer efficiency, stimulate energy release, reduce Gibbs free energy of the half reaction of organic carbon oxidation (ΔG_cox⁰) and promote energy metabolism to accelerate straw degradation and CH₄ generation.

Keywords: Energy metabolism; FT-ICR MS; Metabolic function; NanoFe(3)O(4); Rice straw degradation.

MeSH terms

Energy Metabolism
Methane
Oryza*
Soil
Soil Microbiology*

Substances

Soil
Methane