4.7 Article

Design and scale-up of an oxidative scrubbing process for the selective removal of hydrogen sulfide from biogas

Journal

JOURNAL OF HAZARDOUS MATERIALS
Volume 215, Issue -, Pages 49-56

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2012.02.028

Keywords

Hydrogen sulfide; Hydrogen peroxide; Selective absorption; Biogas upgrading; Biogas desulfurization

Funding

  1. FFG - Die Oesterreichische Forschungsfoerderungsgesellschaft, Klima- und Energiefonds
  2. Biogas Bruck/Leitha GmbH
  3. BIONIK Filtersysteme GmbH

Ask authors/readers for more resources

Reliable and selective removal of hydrogen sulfide (H2S) is an essential part of the biogas upgrading procedure in order to obtain a marketable and competitive natural gas substitute for flexible utilization. A promising biogas desulfurization technology has to ensure high separation efficiency regardless of process conditions or H2S load without the use or production of toxic or ecologically harmful substances. Alkaline oxidative scrubbing is an interesting alternative to existing desulfurization technologies and is investigated in this work. In experiments on a stirred tank reactor and a continuous scrubbing column in laboratory-scale, H2S was absorbed from a gas stream containing large amounts of carbon dioxide (CO2) into an aqueous solution prepared from sodium hydroxide (NaOH), sodium bicarbonate (NaHCO3) and hydrogen peroxide (H2O2). The influence of pH, redox potential and solution aging on the absorption efficiency and the consumption of chemicals was investigated. Because of the irreversible oxidation reactions of dissolved H2S with H2O2, high H2S removal efficiencies were achieved while the CO2 absorption was kept low. At an existing biogas upgrading plant an industrial-scale pilot scrubber was constructed, which efficiently desulfurizes 180 m(3)/h of raw biogas with an average removal efficiency of 97%, even at relatively high and strongly fluctuating H2S contents in the crude gas. (C) 2012 Elsevier B.V. All rights reserved.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available