Free nitrous acid (FNA)-based pretreatment enhances methane production from waste activated sludge

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Qilin Wang
  • Liu Ye
  • Guangming Jiang
  • Paul D. Jensen
  • Damien J. Batstone

Detail(s)

Original languageEnglish
Pages (from-to)11897-11904
Journal / PublicationEnvironmental Science and Technology
Volume47
Issue number20
Publication statusPublished - 15 Oct 2013
Externally publishedYes

Abstract

Anaerobic digestion of waste activated sludge (WAS) is currently enjoying renewed interest due to the potential for methane production. However, methane production is often limited by the slow hydrolysis rate and/or poor methane potential of WAS. This study presents a novel pretreatment strategy based on free nitrous acid (FNA or HNO2) to enhance methane production from WAS. Pretreatment of WAS for 24 h at FNA concentrations up to 2.13 mg N/L substantially enhanced WAS solubilization, with the highest solubilization (0.16 mg chemical oxygen demand (COD)/mg volatile solids (VS), at 2.13 mg HNO 2-N/L) being six times that without FNA pretreatment (0.025 mg COD/mg VS, at 0 mg HNO2-N/L). Biochemical methane potential tests demonstrated methane production increased with increased FNA concentration used in the pretreatment step. Model-based analysis indicated FNA pretreatment improved both hydrolysis rate and methane potential, with the highest improvement being approximately 50% (from 0.16 to 0.25 d-1) and 27% (from 201 to 255 L CH4/kg VS added), respectively, achieved at 1.78-2.13 mg HNO2-N/L. Further analysis indicated that increased hydrolysis rate and methane potential were related to an increase in rapidly biodegradable substrates, which increased with increased FNA dose, while the slowly biodegradable substrates remained relatively static. © 2013 American Chemical Society.

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Citation Format(s)

Free nitrous acid (FNA)-based pretreatment enhances methane production from waste activated sludge. / Wang, Qilin; Ye, Liu; Jiang, Guangming et al.
In: Environmental Science and Technology, Vol. 47, No. 20, 15.10.2013, p. 11897-11904.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review