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Molecules 2009, 14(11), 4396-4405; doi:10.3390/molecules14114396

1-Methyl-3-octylimidazolium Chloride—Sorption and Primary Biodegradation Analysis in Activated Sewage Sludge

1, 1,* , 2, 1, 2 and 1
1 Department of Chemical Technology, Chemical Faculty, Gdańsk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, Poland 2 Faculty of Chemistry, University of Gdańsk, Sobieskiego 18, PL 80-233 Gdańsk, Poland
* Author to whom correspondence should be addressed.
Received: 30 August 2009 / Revised: 28 October 2009 / Accepted: 30 October 2009 / Published: 2 November 2009
(This article belongs to the Special Issue Ionic Liquids)
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Ionic liquids (ILs) are known to be non-volatile and thus to have low potential for atmospheric contamination or intoxication of humans by inhalation. However ILs have the potential to contaminate soil and water as they might be water soluble and can be sorbed onto solids. The investigation of possible natural ways of reducing the concentration of ILs in the environment is of high importane, especially because the requirement for biodegradable chemicals increases, together with pressure for reduction of incineration and landfill waste. It was found that the upper concentration threshold for primary biodegradation of 1-methyl-3-octylimidazolium chloride is 0.2 mM. At higher concentrations the dehydrogenase activity of the cells dropped markedly, indicating that the IL inhibits cell activity. This concentration is in good agreement with the minimal inhibitory concentration of the same compound found for a series of bacteria and fungi by this research group. The sorption of 1-methyl-3-octylimidazolium chloride was found to be significant, and the sorption coefficient was determined to be 98.2 L kg-1.
Keywords: ionic liquids; sewage sludge; biodegradation; imidazolium; sorption ionic liquids; sewage sludge; biodegradation; imidazolium; sorption
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Markiewicz, M.; Jungnickel, C.; Markowska, A.; Szczepaniak, U.; Paszkiewicz, M.; Hupka, J. 1-Methyl-3-octylimidazolium Chloride—Sorption and Primary Biodegradation Analysis in Activated Sewage Sludge. Molecules 2009, 14, 4396-4405.

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