Fresenius' Journal of Analytical Chemistry

, Volume 354, Issue 1, pp 66–71

Cyclic siloxanes in the biological waste water treatment process – Determination, quantification and possibilities of elimination

  • Rene Huppmann
  • Horst Werner Lohoff
  • Horst Friedrich Schröder
Original papers

DOI: 10.1007/s002169600011

Cite this article as:
Huppmann, R., Lohoff, H. & Schröder, H. Fresenius J Anal Chem (1996) 354: 66. doi:10.1007/s002169600011

Abstract.

Volatile cyclic organic siloxanes in the biogas of digested sludge can shorten the life time of gas engines producing energy from the biogas. These siloxanes have been determined by gas chromatography on a fused-silca column using flame ionization detection (GC/FID). To extract siloxanes from biogas, spiked biogas or spiked carbon dioxide XAD resins, activated carbon, polyurethane foam and tetradecane have been tested. Adsorption from the gas have been accomplished successfully with XAD resins, activated carbon and tetradecane, but quantitative recoveries from the adsorbens have been achieved only using XAD and ultra sonification. Determinations from waste water, activated or digested sludge could be carried out successfully after stripping the siloxanes from these samples by helium and adsorption on XAD. Elimination from biogas was possible by adsorption or degradation. XAD adsorption eliminated siloxanes quantitatively but the regeneration of the resins was necessary. Aqueous sodium hydroxide solutions at 20 or 60°C have proven as ineffective in degradation whereas concentrated sulfuric acid at a temperature of 60°C eliminated siloxanes quantitatively.

Copyright information

© Springer-Verlag Berlin Heidelberg 1996

Authors and Affiliations

  • Rene Huppmann
    • 1
  • Horst Werner Lohoff
    • 2
  • Horst Friedrich Schröder
    • 2
  1. 1.Fachhochschule Aachen, FB 3, D-52074 Aachen, GermanyDE
  2. 2.Institut für Siedlungswasserwirtschaft, Aachen Technical University, D-52056 Aachen, GermanyDE