Experimental Study On Effects Of Activated Carbon Mixed Filler On Decontamination Of Toluene-containing Exhaust Gas Using Non-thermal Plasma

This paper used toluene-containing exhaust gas as the experimental object, usedthe activated carbons and ceramic rings filler which mixed in a certain proportion, toresearch how the packed bed reactor impacts toluene removal performance. Ceramicrings in the mixed filler could be conducive to enhancing the intensity of discharge, andactivated carbons could improve the adsorption capacity of fillers. Thus further reducedthe energy consumption of the reactor, and reduced or avoided secondary pollution.Thispaper also did some systematic research on plasma regeneration of the activated carbonin the mixed filler. The main results were as follows:（1） According to the voltage-current wave forms, the mixed filler increased thenumber of reactor’s micro discharge, reduced the maximum amplitude of pulse current,so that the discharge became more uniform and stable; but also can effectively inhibitedthe gas breakdown. Compared to single mixed filler adsorption of toluene, thebreakthrough time of adsorption can be extended for75min.（2） The toluene removal rate increased more obviously（18.9%） when the fillermixing ratio raised from1:24to1:12, but only increased1.1%when the filler mixingratio raised from1:12to1:8. The toluene removal rate increased significantly withenhancing of applied voltage, while decreased with increasing of empty tower gasvelocity and inlet concentration.（3） During toluene degradation process, only detected CO, CO₂, H₂O and a smallamount of O₃from outlet of reactor. According to the analysis of FT-IR and GC/MS, theintermediate product of the degradation of toluene which adsorbed by activated carbon were benzaldehyde, benzoic acid, benzene and ethers. This illustrated that packingactivated carbon could reduce the production of by-products.（4） During plasma regeneration process, no toluene was detected from outlet ofreactor. The breakthrough time of adsorption after regeneration was shorter than beforeregeneration. Extending regeneration time, enhancing applied voltage contributed tohigher regeneration efficiency. With the increase of regeneration frequency, theregeneration efficiency of activated carbon decreasd. The regeneration efficiency ofactivated carbon was96.3%when regenerated for120min, increased2%,7%respectively compared with regenerated for60min,30min. According to the result ofBET and SEM, the plasma would destroy the pore structure of activated carbon whenextending regeneration time.