scholarly journals Interactions of ammonium-smectite with volatile organic compounds from leachates

Clay Minerals ◽  
2017 ◽  
Vol 52 (1) ◽  
pp. 143-159 ◽  
Author(s):  
Mathieu Gautier ◽  
Fabrice Muller ◽  
Lydie Le Forestier
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Van Der Waals Interactions ◽  
Methyl Tert Butyl Ether ◽  
Butyl Ether ◽  
Tert Butyl ◽  
Volatile Organic ◽  
High Concentrations ◽  
Sorption Mechanisms ◽  
Clay Barrier

AbstractThe percolation of water through waste landfills produces leachates with high concentrations of which can generate -exchanged clays within geochemical barriers. These leachates also contain several volatile organic compounds (VOCs) which can interact with the clay barrier. The aim of the present study was to characterize the sorption of eight short-chain VOCs (acetonitrile, methyl tert-butyl ether, dichloromethane, benzene, phenol, ethanol, acetone and aniline) on -smectite, and to identify their sorption mechanisms. The samples treated were characterized by carbon and nitrogen elemental analysis, infrared spectroscopy, powder X-ray diffraction, and thermogravimetric analysis. For acetonitrile, methyl tert-butyl ether, dichloromethane and benzene, no sorption was detected. Phenol, ethanol and acetone were sorbed very weakly, through Van der Waals interactions. Aniline molecules were sorbed strongly on -smectite mainly with hydrogen bonds between aniline and interlayer water molecules. However, aniline sorption decreased the hydrophilic character of the -smectite, which may increase the permeability of the clay barrier.

scholarly journals Long-term study of migration of volatile organic compounds from cross-linked polyethylene (PEX) pipes and effects on drinking water quality

2011 ◽  
Vol 9 (3) ◽  
pp. 483-497 ◽  
Author(s):  
Vidar Lund ◽  
Mary Anderson-Glenna ◽  
Ingun Skjevrak ◽  
Inger-Lise Steffensen
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Drinking Water Quality ◽  
Methyl Tert Butyl Ether ◽  
Potential Health ◽  
Tert Butyl ◽  
Long Term Study ◽  
Volatile Organic

The objectives of this study were to investigate migration of volatile organic compounds (VOCs) from cross-linked polyethylene (PEX) pipes used for drinking water produced by different production methods, and to evaluate their potential risk for human health and/or influence on aesthetic drinking water quality. The migration tests were carried out in accordance with EN-1420-1, and VOCs were analysed by gas chromatography-mass spectrometry. The levels of VOC migrating from new PEX pipes were generally low, and decreasing with time of pipe use. No association was found between production method of PEX pipes and concentration of migration products. 2,4-di-tert-butyl phenol and methyl tert-butyl ether (MTBE) were two of the major individual components detected. In three new PEX pipes, MTBE was detected in concentrations above the recommended US EPA taste and odour value for drinking water, but decreased below this value after 5 months in service. However, the threshold odour number (TON) values for two pipes were similar to new pipes even after 1 year in use. For seven chemicals for which conclusions on potential health risk could be drawn, this was considered of no or very low concern. However, odour from some of these pipes could negatively affect drinking water for up to 1 year.

scholarly journals Effect of organic compounds on nanoparticle formation in diluted diesel exhaust

2004 ◽  
Vol 4 (3) ◽  
pp. 609-620 ◽  
Author(s):  
U. Mathis ◽  
M. Mohr ◽  
R. Zenobi
Keyword(s):  
Organic Compounds ◽  
Methyl Tert Butyl Ether ◽  
Scanning Mobility Particle Sizer ◽  
Butyl Ether ◽  
Nucleation Mode ◽  
Particle Sampling ◽  
Wide Range ◽  
Volatile Organic ◽  
Particle Sizer ◽  
Diesel Vehicle

Abstract. The nucleation of nanoparticles in the exhaust of a modern light-duty diesel vehicle was investigated on a chassis dynamometer. This laboratory study is focused on the influence of volatile organic compounds (VOCs) on nucleation of volatile nanoparticles. Different organic compounds were added to the dilution air of the particle sampling under different sampling conditions. Sample temperature and relative sample humidity were varied in a wide range. The number size distribution of the particles was measured with a scanning mobility particle sizer (SMPS) and showed significant differences in response to the added organic compounds. While the nucleation mode particles showed a large variation in concentration, the accumulation mode particles remained unchanged for all compounds. Depending on the functional group, organic compounds were capable of initiating and increasing (alcohols and toluene) or decreasing (acetone, aniline, and methyl tert-butyl ether (MTBE)) nucleation mode particles. Short volatile aliphatic hydrocarbons (hexane and cyclohexane) turned out to be without effect on nucleation of nanoparticles. Possible reasons for the differences are discussed.

Air purification system

2020 ◽  
pp. 118-122
Keyword(s):  
Hydrogen Sulfide ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
The Other ◽  
Air Purification ◽  
Purification System ◽  
Volatile Organic ◽  
High Concentrations

An air purification system based on the use of specialized catalytic filling, designed to reduce high concentrations of hydrogen sulfide and volatile organic compounds is represented. The system is a 20 or 40 foot heated sea container in which two catalytic charge units are located: one is a working and the other is a reserve. Each block contains one cleaning step with a specialized ferrous charge.

Sign in / Sign up

Export Citation Format

Share Document