Batch influences of exogenous hydrogen on both acidogenesis and methanogenesis of excess sludge

Xiaodi Hao, Ranbin Liu, Mark C.M. van Loosdrecht, Daqi Cao

Research output: Contribution to journalArticleScientificpeer-review

9 Citations (Scopus)

Abstract

Methane (CH4) recovery from excess sludge plays an important role in wastewater treatment aimed at achieving carbon neutrality. Besides pretreatment for excess sludge, exogenous CO2and even H2have already been tested in enhancing CH4production from anaerobic digestion (AD). However, exogenous H2injected into AD might simultaneously influence both upstream acidogenesis and downstream methanogenesis. In this study, a series of batch tests were conducted to ascertain the influences of hydrogen partial pressure (PH2) on these two processes. Interestingly, the batch tests demonstrated that injecting exogenous H2into AD at the beginning of each batch cycle can both stimulate acidogenesis (organic conversion rate) and enhance methanogenesis (both CH4and biogas productions) at an appropriate PH2(=0.33 bar) and an optimal revolution (Rs = 200 rpm) of a shaker.

Original languageEnglish
Pages (from-to)544-550
Number of pages7
JournalChemical Engineering Journal
Volume317
DOIs
Publication statusPublished - 2017

Keywords

  • Anaerobic digestion
  • CH
  • Excess sludge
  • Exogenous H
  • Hydrogen partial pressure

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