Siloxane removal from biosolids by peroxidation

L Appels, Jan Baeyens, R Dewil

Research output: Contribution to journalArticle

50 Citations (Scopus)


The anaerobic digestion of WAS (commonly called biosolids) is widely used since it offers advantages of decomposing organic material, destroying pathogens, stabilising the sludge and producing a high calorific biogas which can be energetically valorised e.g. in a CHP unit. The presence of volatile siloxanes (SX) in the sludge can however largely hamper the energy use of the biogas since they are transformed into an abrasive microcrystalline silica during the biogas combustion: this silica coats and damages the gas beneficiation equipment. This paper studies the use of peroxidation to reduce the siloxane content of WAS. These methods both transform the siloxanes into lower molecular weight siloxanes and silica, and degrade the EPS to which the siloxanes are bound, thus enhancing their volatilisation before digestion. A reduction of approximately 50% is observed for all peroxidants Studied, except in the DMDO peroxiclation of D4, where a reduction of 85% is observed. Although the reduction percentages are significant, an additional biogas purification step might remain necessary to reduce the siloxane concentrations below the limits defined by the engine manufacturers. (C) 2008 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)2859-2864
Number of pages6
JournalEnergy Conversion and Management
Issue number10
Publication statusPublished - 1 Oct 2008


  • waste activated sludge
  • biogas
  • biosolids
  • siloxanes
  • peroxidation


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