The removal of xylene vapors was studied in a biofilter packed with a new hybrid (scoria/compost) packing material at various inlet loads (IL) and empty bed residence times (EBRT) of 90, 60, and 40s. The best performance was observed for EBRT of 90s, where a removal efficiency of 98% was obtained under steady state condition for inlet xylene concentration of 1.34 g m(-3), while a maximum elimin...

Alkylbenzenes, such as toluene and m-xylene, are an important class of contaminant hydrocarbons that are widespread and tend to accumulate in subsurface anoxic environments. The peripheral pathway for the anaerobic oxidation of toluene in bacteria consists of an initial activation catalyzed by a benzylsuccinate synthase (encoded by bss genes), and a subsequent modified β-oxidation of benzylsucc...

This work reports an experimental and kinetic modelling investigation on flow reactor pyrolysis jet-stirred oxidation of o-xylene. The experiments were conducted over 1050–1600 K at 0.04 1.0 atm. Key products related to fuel decomposition such as o-xylyl radical, o-xylylene, benzocyclobutene styrene, well polycyclic aromatic hydrocarbons (PAHs), detected by using synchrotron vacuum ultraviolet ...

Zirconia-supported tungsten oxide (WO(x)/ZrO(2)) is considered an important supported metal oxide model acid catalyst, for which structure-property relationships have been studied for numerous acid-catalyzed reactions. The catalytic activity for xylene isomerization, alcohol dehydration, and aromatic acylation follows a volcano-shape dependence on tungsten surface density. However, WO(x)/ZrO(2)...

Molecular sieving MFI-type zeolite membranes were prepared by a secondary growth method without using an organic template. Silicalite membranes with intercrystalline pores minimized or eliminated were obtained by this synthesis method which avoids the template removal step. The silicalite membrane exhibits molecular sieving characteristics with pervaporation separation factor for p-xylene to o-...

Four pure cultures of denitrifying bacteria, which had previously been isolated on defined alkylbenzenes, were capable of anaerobic growth with crude oil as the only source of organic substrates. Chemical analyses after growth revealed that the known growth substrates toluene, ethylbenzene, and m-xylene were selectively consumed from the oil. o-Xylene and p-xylene, which as pure compounds did n...

A physiological pharmacokinetic model of the transfer of organic solvents in the human body was developed. The model was comprised of seven compartments, i.e., lungs, vessel-rich tissues, vessel-poor tissues, muscles, fat tissues, gastrointestinal tissues, and liver, each being connected to the others by blood fiow. The transfer of organic solvents was expressed by simultaneous differential equ...