« Previous AbstractIntegrating Insect Life History and Food Plant Phenology: Flexible Maternal Choice Is Adaptive    Next AbstractApplication of PTR-MS for measuring odorant emissions from soil application of manure slurry »

J Environ Qual

Title:		Evaluation of biological air filters for livestock ventilation air by membrane inlet mass spectrometry
Author(s):		Feilberg A; Adamsen AP; Lindholst S; Lyngbye M; Schafer A;
Address:		"Dep. of Aricultural Engineering, Faculty of Agricultural Sciences, Aarhus University, 8830 Tjele, Denmark. anders.feilberg@agrsci.dk"
Journal Title:		J Environ Qual
Year:		2010
Volume:		20100413
Issue:		3
Page Number:		1085 - 1096
DOI:		10.2134/jeq2009.0184
ISSN/ISBN:		0047-2425 (Print) 0047-2425 (Linking)
Abstract:		"Biological air filters have been proposed as a cost-effective technology for reducing odor emissions from intensive swine production facilities. In this work we present results from the application of membrane inlet mass spectrometry (MIMS) for continuously monitoring the removal of odorous compounds in biological air filters. The sensitivity and selectivity were tested on synthetic samples of selected odorous compounds, and linearity and detection limits in the lower ppb range were demonstrated for all compounds tested (methanethiol, dimethyl sulfide, carboxylic acids, 4-methylphenol, aldehydes, indole, and skatole) except trimethylamine. The method was applied in situ at two full-scale filters installed at swine houses. The results have been compared with analyses by thermal desorption gas chromatography-mass spectrometry (TD-GC/MS), and odor was measured by olfactometry. By comparison with TD-GC/MS, observed MIMS signals were assigned to 4-methylphenol, 4-ethylphenol, indole, skatole, the sum of volatile reduced organic sulfur compounds (ROS), and three subgroups of carboxylic acids. The removal rates were observed to be related to air-water partitioning with removal efficiencies in the range of 0 to 50% for low-soluble organic sulfur compounds and high removal efficiencies (typically 80-100%) for more soluble phenols and carboxylic acids. Based on the results and published odor threshold values, it is estimated that the low removal efficiency of ROS is the main limitation for achieving a higher odor reduction"
Keywords:		"Animals *Animals, Domestic Filtration/*instrumentation/methods *Housing, Animal Mass Spectrometry/*methods Odorants Ventilation/*instrumentation;"
Notes:		"MedlineFeilberg, Anders Adamsen, Anders P S Lindholst, Sabine Lyngbye, Merete Schafer, Annette eng Evaluation Study 2010/04/20 J Environ Qual. 2010 Apr 13; 39(3):1085-96. doi: 10.2134/jeq2009.0184. Print 2010 May-Jun"