Enhancing the CH4 yield of anaerobic digestion via endogenous CO2 fixation by exogenous H2

Yuansheng Hu; Xiaodi Hao; Dan Zhao; Kunming Fu

doi:10.1016/j.chemosphere.2014.10.022

Enhancing the CH4 yield of anaerobic digestion via endogenous CO2 fixation by exogenous H2

Chemosphere. 2015 Dec:140:34-9. doi: 10.1016/j.chemosphere.2014.10.022. Epub 2014 Nov 6.

Authors

Yuansheng Hu¹, Xiaodi Hao², Dan Zhao¹, Kunming Fu¹

Affiliations

¹ Beijing University of Civil Engineering and Architecture/Beijing Climate Change Research and Education Centre, Beijing 100044, PR China.
² Beijing University of Civil Engineering and Architecture/Beijing Climate Change Research and Education Centre, Beijing 100044, PR China. Electronic address: xdhao@hotmail.com.

PMID: 25455677
DOI: 10.1016/j.chemosphere.2014.10.022

Abstract

A large amount (25-60%) of degraded organics is converted directly to CO2 during anaerobic digestion (AD) process, which substantially lowers the energy (methane, CH4) yield. In this study, endogenous CO2 fixation by H2 from in-situ iron corrosion was explored to enhancing the CH4 yield. The results demonstrated that a substantial enhancement (up to 61%) in the CH4 yield could be achieved with both nano-scale zero-valent iron (NZVI) and waste iron scraps (WIS) being the added iron. Additionally, the added iron could also achieve effective phosphorus removal from the AD supernatant.

Keywords: Anaerobic digestion; Carbon fixation; Hydrogen; Iron corrosion; Waste activated sludge.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Anaerobiosis
Carbon Dioxide / metabolism*
Digestion
Hydrogen / metabolism*
Iron
Methane / metabolism*
Sewage
Waste Disposal, Fluid / methods*

Substances

Sewage
Carbon Dioxide
Hydrogen
Iron
Methane