Odor pollution is one of the seven public pollutions in the world, and it is urgent to find effective control approach for odor pollution. Biofilter/biotrickling filter is an attractive odor removal technique with the advantages of cost-effectiveness and easy operation. High efficiency of biofilter/biotrickling filter has been demonstrated in many applications. However, the lack of overall knowledge with respect to microbial ecology, process control and new effective packing materials are drawbacks...