In this study, the effect of inlet concentration pollutants, empty bed residence time (EBRT) and liquid recycling velocity on performance BTF was explored. The results showed best operating characteristics biotrickling filter for study were at an 500 mg/m3�Cthe EBRT 300s 25.46 m h-1. At condition, total removal efficiency pollutants can reach more than 90%. Among them, toluene ethylbenzene abov...

M. W. Trahan, J. S. Wagner, I. R. Shokair, G. C. Tisone, P. C. Gray Sandia National Laboratories Albuquerque, NM 87185 Abstract Intelligent algorithms have been used to estimate the concentrations of individual components in complex mixtures scanned by a multispectral UV laser remote-sensing system. The data was acquired during the Kitfox test series at the 1.4 km site on Frenchman Flats at the...

Abstract The levels of volatile organic compounds (VOCs) such as Benzene, Toluene, Ethylbenzene, and Xylene isomers (BTEX) are important parameters for an indoor air quality assessment. Exposure to BTEX in science laboratories a university can potentially cause health risks workers. Active sampling was carried out using Tenax® GR sorbent tubes analyzed with thermal desorption gas chromatography...

Toluene and m-xylene were rapidly mineralized in an anaerobic laboratory aquifer column operated under continuous-flow conditions with nitrate as an electron acceptor. The oxidation of toluene and m-xylene was coupled with the reduction of nitrate, and mineralization was confirmed by trapping 14CO2 evolved from 14C-ring-labeled substrates. Substrate degradation also took place when nitrous oxid...

Preignition and Autoignition Behavior of the Xylene Isomers Robert H. Natelson Nicholas P. Cernansky, Ph.D. and David L. Miller, Ph.D. The relative preignition and autoignition reactivity of the xylene isomers (o-, mand p-xylene, or 1,2-, 1,3-, and 1,4-dimethylbenzene) has been studied. The principal objectives were to determine the relative reactivity among the isomers and the key oxidation br...

An energy-efficient adsorptive molecular sieving strategy is reported using a crystalline trianglimine macrocycle to separate the elusive m -xylene isomer with over 91% purity.

The primary objective of this study was to evaluate the impact of substrate interactions on the biotransformation rates and mineralization potentials of gasoline monoaromatics and methyl tert-butyl ether (MTBE), compounds that commonly co-exist in groundwater contaminant plumes. A mixed culture was derived from gasoline-contaminated aquifer material using toluene as the enrichment substrate. Tw...

The performance of two laboratory-scale biofilters packed with pressmud (BF1) and sugarcane bagasse (BF2) was evaluated for gas-phase xylene removal under various operating conditions. Biofilter was inoculated with a mixed culture obtained from pharmaceutical sludge. Experiments were carried out at different flow rates (0.03, 0.06, 0.09 and 0.12 m h) and inlet xylene concentrations (0.2, 0.4, 0...