The Study of Trickle-Bed Bioreactors and Biofilters to Treat Waste Gases Containing Trimethylamine

• Main Authors: Lin, Shih-Che, 林世哲
• Other Authors: Shyh-Jye Hwang
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/68981878285101825353

碩士 === 國立清華大學 === 化學工程學系 === 85 === Biofiltration of polluted gas stream containing malodorous trimethylamine (TMA) was studied in this work. The experiments were structured in two laboratory-scale reactors. One is the biofilter with a mixture of sieved compost and diatomaceous earth particles as the filter material, and another is the trickle-bed bioreactor with diatomaceous earth particles as the reactor material, on both which the microorganisms were immobilized. The inlet concentration of TMA varied from 0.174 to 2.61 g/m3, whilethe superficial inlet gas stream velocity ranged from 1.34 to 2.95 cm/s. In the steady state part, the removal efficiency of trimethylamine in the biofilter and trickle-bed bioreactor decreased as the inlet gas velocity or TMA inlet concentration increase, and the elimination capacity of the biofilter was 55 g/m3hr. Moreover, due to TMA easy dissolved in the water, TMA in the trickle-bed bioreactor could reacted aerobic nitrification, and detected nitrate in the recycle nutrient liquid. Since nitrogen gas exited about 2% from calculation nitrogen balance, it showed that anaerobic denitrification did react due to the overthickness of biofilm. In addition, compared to the model in the steady state biofilter proposed by Tang et al., the experiment data could fit the curves drawn by the model. In the portion of unsteady state, the trickle-bed bioreactor could acclimate to the change the environment better and reached to new steady state faster than the biofilter.