Biofiltration of composting gases using different municipal solid waste-pruning residue composts: Monitoring by using an electronic nose

► We assayed four compost biofilter beds for treating air from kitchen waste composting. ► Biofilter composts, of different particle sizes, were made from MSW with and without pruning waste. ► VOC removal efficiencies were greater than 90% for all composts. ► An electronic nose detected qualitative differences due to compost type. ► Data sets from electronic nose can be correlated to those of photoionization detector.