Theoretical models are developed to qualify diffusion characteristics for all three types of reactors. Biofilter model design is further discussed in terms of both first order and zero order reaction kinetics. Experimental data are presented and compared with data obtained from the theoretical model. The theoretical and experimental results show excellent correlation. Experiments with toluene and ethyl acetate were both found to follow zero order degradation kinetics with maximum elimination capacities of 21 and 27 grams of compound per cubic meter per hour, respectively.
Microbial populations are qualified and quantified for the three reactors.
New developments in biological purification are discussed, including structural properties of the filter bed, multistage processes, and elimination of recalcitrant compounds.