Biological Trickling Filter Treatment Butanol Exhaust

Biotrickling filtration is a new technology in air pollution biotechnologies. Because of its advantages, such as easily addition of nutrition and pH buffer substances, easily controlling of react condition, low cost, the packing media with high porosity and long life-span, biotrickling filtration has received greater attention of scholars around the world.The paper introduced the fundamental mechanisms involved during biotrickling filtration and development of the technology. The research through the experiments were showed as follows: to educe the qualitative relation of inlet gas loadings and removal loadings; to study the effect of gas flow rate and liquid flow rate on the removal performance of BTF; to study the concentration distribution of 1-butanol and metabolized product CO2; to study the effect of shock loading and no-use of fixing on removal capability. Moreover, the writer primarily analyzed the state of microorganism; used relative removal loadings method to compare the performance of four packing media; validated Ottengraf Model.The experiment results showed as follows: the maximum elimination capacity(EC) of 1-butanol could be reached to 77g/m3·h. Inlet gas loading had a linear relationship with removal loading and removal loading increased in pace with the increase of inlet gas loading; removal loading decreased with increased gas flow rate at fixed inlet gas loading. The current of removal efficiency decreased with increasing the inlet gas concentration was flat when empty bed retention time(EBRT) was higher; removal efficiency rapidly decreased with increasing the inlet gas concentration when EBRT was lower, the current goes flat when inlet gas concentration increased. Removal efficiency had no apparently decreased when the inlet gas flow rate below 1.0m3·h-1, but had decreased greatly when inlet gas flow rate over 1.0m3·h-1. Removal efficiency decreased with increased liquid flow rate when liquid flow rate over 4.14L·h-1. The optimal liquid/gas radio of the plant is 4.08L/m3. There were variable bacterial species and biofilm quality decreased along the height in biotrickling filter. The CO2 concentration increased with decreased 1-butanol concentration. Biotrickling filter has a good ability of anti-shock-loading and recovering removal efficiency from no-use. Experiments were conducted to evaluate the performance of stainless steel weir mesh, ceramic raschig rings, lava stone and granule activated carbon, which were supported as packing media in biotrickling filter. The results showed that stainless steel weir mesh as a bio-carrier, had a better than other three packing media. Ottengraf model, the"absorption-biofilm"model, simulated preferably the 1-butanol concentration in biotrickling filter in steady state.The experiment had a practical value and offered useful reference to get wider application of biotrickling filtration treating with industrial waste gas.