Simultaneous Removal of Dissolved Methane and Nitrogen from Synthetic Mainstream Anaerobic Effluent

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

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Author(s)

  • Tao Liu
  • Jie Li
  • Zhuan Khai Lim
  • Hui Chen
  • Shihu Hu
  • Jianhua Guo

Detail(s)

Original languageEnglish
Pages (from-to)7629-7638
Journal / PublicationEnvironmental Science and Technology
Volume54
Issue number12
Online published20 May 2020
Publication statusPublished - 16 Jun 2020
Externally publishedYes

Abstract

Anaerobic technologies have been proposed as a promising solution to enhance bioenergy recovery and to transform a wastewater treatment plant (WWTP) from an energy consumer to an energy exporter. However, 20-60% of the methane produced remains dissolved in the anaerobically treated effluent, which is a potent greenhouse gas and is easily stripped out in the aeration tank. This study aims to develop a solution using dissolved methane to support denitrification, thus simultaneously enhancing nitrogen removal and achieving beneficial use of dissolved methane. By coupling anaerobic ammonium oxidation (anammox) with nitrite/nitrate-dependent anaerobic methane oxidation (n-DAMO), up to 85% of dissolved methane and more than 99% of nitrogen were removed in parallel in a biofilm system. Mass balance was conducted during both long-term operation and short-term batch tests, which indicated that n-DAMO bacteria and n-DAMO archaea indeed contributed jointly to the methane removal. The 16S rRNA gene amplicon sequencing further showed the co-presence of n-DAMO bacteria and n-DAMO archaea, while anammox bacteria were detected with a low relative abundance. This proposed technology can potentially be applied to reduce the carbon footprint and to save the organic carbon consumption in WWTPs. © 2020 American Chemical Society.

Citation Format(s)

Simultaneous Removal of Dissolved Methane and Nitrogen from Synthetic Mainstream Anaerobic Effluent. / Liu, Tao; Li, Jie; Khai Lim, Zhuan et al.
In: Environmental Science and Technology, Vol. 54, No. 12, 16.06.2020, p. 7629-7638.

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