Augmented biohydrogen production from rice mill wastewater through nano-metal oxides assisted dark fermentation

K. Rambabu, G. Bharath, A. Thanigaivelan, D. B. Das, Pau Loke Show, Fawzi Banat

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

This study highlights biohydrogen production enrichment through NiO and CoO nanoparticles (NPs) inclusion to dark fermentation of rice mill wastewater using Clostridium beijerinckii DSM 791. NiO (~26 nm) and CoO (~50 nm) NPs were intrinsically prepared via facile hydrothermal method with polyhedral morphology and high purity. Dosage dependency studies revealed the maximum biohydrogen production characteristics for 1.5 mg/L concentration of both NPs. Biohydrogen yield was improved by 2.09 and 1.9 folds higher for optimum dosage of NiO and CoO respectively, compared to control run without NPs. Co-metabolites analysis confirmed the biohydrogen production through acetate and butyrate pathways. Maximum COD reduction efficiencies of 77.6% and 69.5% were observed for NiO and CoO inclusions respectively, which were higher than control run (57.5%). Gompertz kinetic model fitted well with experimental data of NPs assisted fermentation. Thus, NiO and CoO inclusions to wastewater fermentation seems to be a promising technique for augmented biohydrogen production.

Original languageBritish English
Article number124243
JournalBioresource Technology
Volume319
DOIs
StatePublished - Jan 2021

Keywords

  • Biohydrogen
  • Clostridium beijerinckii
  • COD reduction efficiency
  • CoO nanoparticles
  • NiO nanoparticles
  • Rice mill wastewater

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