1. Abetment techniques 2. Biological based methods for the removal of VOCs and heavy metals 3. Performance parameters of biofiltration 4. Analysis of product streams in biofilter columns 5. Research status of biofiltration 6. Biofilter media 7. Controlling factors and operation of biofilters 8. Microbial ecology of biofiltration 9. Design and evaluation of open biofilters for the treatment of emerging contaminants 10. Mechanisms of biofiltration 11. Applications of biofiltration