Journal
FUEL
Volume 320, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.123923
Keywords
Organic fraction of municipal solid waste; Anaerobic digestion; Excessive acidification; Zero valent iron; Nanoscale zero valent iron
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Funding
- Natural Nature Science Foundation of China [51908396]
- Science and Technology Innovation Major Project of Ningbo, Zhejiang Province of China [2018B10023]
- Applied Basic Research Project of Shanxi Province [20210302124481]
- Graduate Innovation Project of Shanxi Province, China [2021Y243]
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This study found that nanoscale zero valent iron (NZVI) can effectively recover from acidification during anaerobic digestion and improve methane production. Compared to microscale iron, the optimal dosage of NZVI is lower and it can enhance microbial syntrophism.
Fe0 above the micro size (zero valent iron; ZVI) can effectively eliminate or inhibit excessive acidification during anaerobic digestion of the organic fraction of municipal solid waste, particularly at high organic loading rates. However, the role of nanoscale ZVI (NZVI) in anaerobic digestion remains controversial. In this study, the effect of NZVI at different dosages (0.4, 0.5, 0.6, 0.7, 0.8 g/g volatile solids [VS]) on the anaerobic digestion stability of the organic fraction of municipal solid waste was investigated and compared with the performance of ZVI, as were its effects on microbial syntrophism. Similarly to ZVI, NZVI recovered methane production from excessive acidification conditions, but the optimal NZVI dosage (0.4 g/gVS) was far lower than that for ZVI (0.8 g/gVS), and eventually the methane yield reached 324 mL/gVS. Microbial structure changes coupled with substance transformation revealed that NZVI enhanced the metabolism of hydrogenotrophic methanogens for interspecies hydrogen transfer and acetotrophic methanogens.
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