Performance Study on the treatment of VOC Containg Gases from Paint Blending Processes
Abstract (Summary)In response to growing concern over volatile organic compounds (VOCs) biofiltration is becoming an established economical air pollution control technology for removing VOCs from waste air stream. This study armed to develop a trickle-bed biofilter to treat emitted VOCs stream from a piant blending process. Analytical results demonstrated that the VOCs conceratration range is 10 to 1500 ppm calibrated as methane and the major components of the emitted gases are toluene, xyluene, isobutanol, methyl-isopropyl ether, etc. Originally, a full-scale biotrickling filter of 6m ¡Ñ 6m in inner cross-sectional area packed with wood chips(10 cm ¡Ñ 10 cm ¡Ñ 2 cm) to a height of 4 m was used to treat the vent gas with a flow rate of 270 m3/min. A recycle water rate of 400 L/min and a nutrient liquid (acid digested liquor of bird feather) addition rate of 1L/day. Under these operation parameters, the average VOC removal efficiency of the original trickling filter of 28% which was not as good as expected. To improve the efficiency, a pilot biofilter constructed from a 0.3-m x 1.6-m (OD x H) plastic column packed with fam chips to a height of 1 m was used for treating a sample stream of the vent gas. Empty bed retention times in the range of 9.82 to 20 s, corresponding inlet flow rates of 0.68 to 0.27 m3/min and the organic loading rates of 5.18 to 10.37 g/m3.hr were used. As the empty bad retention times was getting shorter, the removal efficiency become lower (from 80 to 75.56%). When the organic loading rose to 186.65 g/m3.hr, the removal efficient also got down to 24%. As the gas temperature droped to 10OC,the removal efficient also decreased to 43%.
Advisor:none; none; none
School Location:China - Taiwan
Source Type:Master's Thesis
Keywords:voc biotrickling biofilter
Date of Publication:09/09/2004