Effects of design parameters on performance and cost analysis of combined ultraviolet-biofilter systems treating gaseous chlorobenzene based on mathematical modeling

Can WANG, Jinying XI, Hongying HU, Insun KANG

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PDF(190 KB)
Front. Environ. Sci. Eng. ›› 2012, Vol. 6 ›› Issue (4) : 588-594. DOI: 10.1007/s11783-012-0433-8
RESEARCH ARTICLE

Effects of design parameters on performance and cost analysis of combined ultraviolet-biofilter systems treating gaseous chlorobenzene based on mathematical modeling

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Abstract

A conceptual mathematical model was used to evaluate the design parameters of a combined ultraviolet (UV)-biofilter system, and perform a cost analysis. Results showed that the UV light source strength and the gas residence times in the UV system (UVRT) and biofilter (EBRT) had positive effects on the overall chlorobenzene removal efficiency of the system. High ratio of UVRT to EBRT improved the removal efficiency, suggesting that the UV system has a greater effect on the overall performance of the system compared with the biofilter. Analysis of the capital and operating costs showed that the capital costs of the standalone biofilter system were much higher than those of the standalone UV system. However, the biofilter operating costs were lower than those of the UV system. The operating costs of the combined UV-biofilter system increased with increasing UVRT/EBRT ratio, whereas its capital costs decreased.

Keywords

volatile organic compounds / ultraviolet (UV) photodegradation / biofilter / modeling / cost analysis

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Can WANG, Jinying XI, Hongying HU, Insun KANG. Effects of design parameters on performance and cost analysis of combined ultraviolet-biofilter systems treating gaseous chlorobenzene based on mathematical modeling. Front Envir Sci Eng, 2012, 6(4): 588‒594 https://doi.org/10.1007/s11783-012-0433-8

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Acknowledgements

This project is supported by new teachers’ fund for Doctor Stations, Ministry of Education, China (No. 20110032120035).
Notation
blight path, 0.04 m
cAchlorobenzene concentration, mg·m-3
cA0inlet chlorobenzene concentration, mg·m-3
cA1outlet chlorobenzene concentration, mg·m-3
E1energy of one photon, 7.8×10-19 J
ϵAmole extinction coefficients, 7.4×103 L·mol-1·cm-1
Iaveaverage light intensity, 38 W·m-3
kreaction rate constant, s-1
NAcell number of chlorobenzene molecules converted to products, unit
Navogadro constant, 6.023×1023 m2·h-1
Qgas flow rate, m3·h-1
rAreaction rate, mg·m-3·h-1
ttime, s
τUVgas empty bed residence time in the UV system, s
VUVUV system volume, m3
xnumber of absorbed photons, unit
Фquantum yield, dimensionless
ηremoval efficiency, dimensionless
aspecific surface area of filter bed, 820, 860 m2·m-3
cgchlorobenzene concentration in gas phase, mg·m-3
cfchlorobenzene concentration in biofilm, mg·m-3
Ddiffusion coefficient in water, 8.8×10-6 m2·h-1
Dfdiffusion coefficient in biofilm, 6.2×10-6 m2·h-1
Jxchlorobenzene flux inside biofilm, mg·m-2·h-1
Kssaturation constant, 1.5 g·m-3
Lwater layer thickness, m
νmmaximum specific substrate degradation rate, 0.85 h-1
Xfmicroorganism concentration inside biofilm, 6.7, 7.2×104 g·m-3
uflow velocity, m·h-1
zrectangular coordinate, m

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