Microaerobic conditions in anaerobic sludge promote changes in bacterial composition favouring biodegradation of polymeric siloxanes.

2021 ◽  
Author(s):  
Andrés Ortíz-Ardila ◽  
Beatriz Díez ◽  
Crispín Celis ◽  
Pavel Jenicek ◽  
Rodrigo A Labatut
Keyword(s):  
Energy Conversion ◽  
Anaerobic Sludge ◽  
Bacterial Composition ◽  
Ecological Dynamics ◽  
Silicon Compounds ◽  
Organic Silicon ◽  
Volatile Organic ◽  
Energy Conversion Systems ◽  
Microaerobic Conditions

Volatile organic silicon compounds (VOSiC) are harmful pollutants to the biota and ecological dynamics as well as biogas-based energy conversion systems. However, there is a lack of understanding regarding the...

Volatile organic silicon compounds: the most undesirable contaminants in biogases

2008 ◽  
Vol 58 (9) ◽  
pp. 1775-1781 ◽  
Author(s):  
Aurélie Ohannessian ◽  
Valérie Desjardin ◽  
Vincent Chatain ◽  
Patrick Germain
Keyword(s):  
Wastewater Treatment Plants ◽  
Landfill Gas ◽  
Preliminary Test ◽  
Industrial Applications ◽  
Combustion Chambers ◽  
Silicon Compounds ◽  
Organic Silicon ◽  
Silicate Formation ◽  
Wide Range ◽  
Volatile Organic

Recently a lot of attention has been focused on volatile organic silicon compounds (VOSiC) present in biogases. They induce costly problems due to silicate formation during biogas combustion in valorisation engine. The cost of converting landfill gas and digester gas into electricity is adversely affected by this undesirable presence. VOSiC in biogases spark off formation of silicate deposits in combustion chambers. They engender abrasion of the inner surfaces leading to serious damage, which causes frequent service interruptions, thus reducing the economic benefit of biogases. It is already known that these VOSiC originate from polydimethylsiloxanes (PDMS) hydrolysis. PDMS (silicones) are used in a wide range of consumer and industrial applications. PDMS are released into the environment through landfills and wastewater treatment plants. There is a lack of knowledge concerning PDMS biodegradation during waste storage. Consequently, understanding PDMS behaviour in landfill cells and in sludge digester is particularly important. In this article, we focused on microbial degradation of PDMS through laboratory experiments. Preliminary test concerning anaerobic biodegradation of various PDMS have been investigated. Results demonstrate that the biotic step has an obvious influence on PDMS biodegradation.

scholarly journals Volatile Organic Silicon Compounds in Biogases: Development of Sampling and Analytical Methods for Total Silicon Quantification by ICP-OES

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Claire Chottier ◽  
Vincent Chatain ◽  
Jennifer Julien ◽  
Nathalie Dumont ◽  
David Lebouil ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Power Plants ◽  
Optical Emission ◽  
Gas Chromatography Mass Spectrometry ◽  
Emission Spectrometry ◽  
Icp Oes ◽  
Silicon Compounds ◽  
Organic Silicon ◽  
Inductively Coupled ◽  
Volatile Organic

Current waste management policies favor biogases (digester gases (DGs) and landfill gases (LFGs)) valorization as it becomes a way for energy politics. However, volatile organic silicon compounds (VOSiCs) contained into DGs/LFGs severely damage combustion engines and endanger the conversion into electricity by power plants, resulting in a high purification level requirement. Assessing treatment efficiency is still difficult. No consensus has been reached to provide a standardized sampling and quantification of VOSiCs into gases because of their diversity, their physicochemical properties, and the omnipresence of silicon in analytical chains. Usually, samplings are done by adsorption or absorption and quantification made by gas chromatography-mass spectrometry (GC-MS) or inductively coupled plasma-optical emission spectrometry (ICP-OES). In this objective, this paper presents and discusses the optimization of a patented method consisting in VOSiCs sampling by absorption of 100% ethanol and quantification of total Si by ICP-OES.

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