Effect of operating temperature on styrene mass transfer characteristics in a biotrickling filter

To study the effect of operating temperature on styrene mass transfer from gas to liquid phase in biotrickling filters (BTFs), overall mass transfer coefficient (K_L a) was calculated through fitting test data to a general mass balance model under abiotic conditions. Styrene was used as the volatile organic compound and the BTF was packed with a mixture of pall rings and pumice. Operating temperature was set at 30°C and 50°C for mesophilic and thermophilic conditions, respectively. K_L a values increased from 54 to 70 h^-1 at 30°C and from 60 to 90 h^-1 at 50°C, respectively, depending on the countercurrent gas to liquid flow ratio that varied in the range of 7.5-32. Evaluation of styrene mass transfer capacity (MTC) showed that liquid-phase mass transfer resistance decreased as the flow ratio increased at constant temperature. MTC also decreased with an increase in operating temperature. Both gas-liquid partition coefficient and K_L a increased with increasing temperature; however the effect on gas-liquid partition coefficient was more significant and served to increase mass transfer limitations. Thermophilic biofiltration on the one hand increases mass transfer limitations, but on the other hand may enhance the biodegradation rate in favor of enhancing BTFs' performance.

Development of a compact MnO2 filter for removal of SO2 from diesel vehicle emissions

Increasing concern about sulfur dioxide (SO₂) from diesel vehicle exhausts causing detrimental effects on NO_x removal catalysts has resulted in the development of dry desulfurization filters for complete removal of SO₂.

Alkyl radical triggered in situ SO2-capture cascades

Born to be useful: an unprecedented in situ SO₂-capture cascade triggered by alkyl radicals has been documented herein.

Development of low-temperature desulfurization performance of a MnO2/AC composite for a combined SO2 trap for diesel exhaust

MnO₂/AC composite was proposed as a low temperature desulfurization material for a combined SO₂ trap.