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  • Performance catalytic ozonation over the carbosieve in the removal of toluene from waste air stream.

Performance catalytic ozonation over the carbosieve in the removal of toluene from waste air stream.

Journal of research in health sciences (2014-09-12)
Mohammad Reza Samarghandi, Seyed Alireza Babaee, Mohammad Ahmadian, Ghorban Asgari, Farshid Ghorbani Shahna, Ali Poormohammadi
ABSTRACT

Toluene is a volatile organic compound, one of 189 hazardous air pollutants (HAPs) and the most important pollutant found in most industries and indoor environments; owing to its adverse health, toluene must be treated before being released into the environment. In this research study, a continuous-flow system (including an air compressor, silica gel filters and activated charcoal, impinger, an ozone generation and a fixed bed reactor packed with the carbosieve in size 1.8-2.3 mm, specific surface: 972 m2/g,) was used. This glass reactor was 0.7 m in height; at a distance of 0.2 m from its bottom, a mesh plane was installed so as to hold the adsorbent. Moreover, 3 l/min oxygen passed through this system, 0.43 g/h ozone was prepared. The flow rate of waste airstream was 300 ml/min. The efficiency of this system for removal of toluene was compared under the same experimental conditions. Under similar conditions, performance of catalytic ozonation was better in toluene removal than that of ozonation and carbosieve alone. On average, increasing the removal efficiency was 45% at all concentrations. When carbosieve and ozone come together, their synergistic effects increased on toluene degradation. Catalytic ozonation is a suitable, high-efficient and available method for removing toluene from various concentrations of waste air stream. This process due to the short contact time, low energy consuming and making use of cheap catalysts can be used as a novel process for removing various concentrations of volatile organic compounds.

MATERIALS
Product Number
Brand
Product Description

Supelco
Carbosieve Adsorbent, matrix Carbosieve G, 80-100 mesh, bottle of 5 g
Supelco
Carbosieve SIII, stainless steel TD tube, O.D. × I.D. × L 6 mm × 4 mm × 7 in., preconditioned, pkg of 1 ea
Supelco
Carbosieve Adsorbent, matrix Carbosieve S-II, 60-80 mesh, bottle of 10 g
Supelco
Carbosieve Adsorbent, matrix Carbosieve S-II, 80-100 mesh, bottle of 10 g
Supelco
Carbosieve Adsorbent, matrix Carbosieve G, 60-80 mesh, bottle of 5 g
Supelco
Carbosieve Adsorbent, matrix Carbosieve S-III, 60-80 mesh, bottle of 10 g