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• W4308625012 startingPage "103292" @default.
• W4308625012 abstract "In this paper, the hydrogen (H 2 ) supply to trickle-bed reactor (TBR) in endogenous and exogenous ways by nano-zero-valent iron (nZVI) corrosion was indicated, in order to increase the biogas generation and methane (CH 4 ) content from wastewater. The results showed that the nZVI corrosion H 2 supply method increased the biogas generation in TBR. The daily average CH 4 yields of TBR in stages 1–4 increased by 23.99 %, 35.76 %, 49.40 % and 56.13 % compared with control stage, respectively, and the highest CH 4 content of 90.72 % was achieved in stage 3. The changes of enzyme concentration indicated that iron from nZVI enhanced the activities of acetate kinase and dehydrogenase, however, the activity of coenzyme F 420 was lower due to the presence of homoacetogenic acetate formation that enhanced the acetoclastic methanogenesis pathway. Changes in the structure of the microbial community played an important role in the mechanism of CH 4 enhancement, and the analysis of microbial abundance showed that the additions of nZVI and ferrous iron (Fe 2+ ) changed the microbial communities, with increased abundances of hydrogenotrophic methanogens and homoacetogen. • The performance of TBR under four H 2 supply ways from nZVI corrosion was investigated. • The average daily biogas and CH 4 yield increased by 39.72 mL biogas/gCOD and 56.13 % after nZVI addition, respectively. • The acetate kinase, dehydrogenase and F 420 activity in TBR were affected by nZVI addition. • The abundance of hydrogenotrophic methanogens and homoacetogen was increased after H 2 supply." @default.
• W4308625012 created "2022-11-13" @default.
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• W4308625012 date "2022-12-01" @default.
• W4308625012 modified "2023-10-18" @default.
• W4308625012 title "The enhanced biological methanation performance in trickle-bed reactor by different continuous hydrogen supply from nano-zero valent iron corrosion" @default.
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• W4308625012 doi "https://doi.org/10.1016/j.jwpe.2022.103292" @default.
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