Experiment of removing formaldehyde, benzene, toluene and xylene mixed gas by biotrickling filter

The factors influencing the performance of biotrickling filter were studied in removing formaldehyde, benzene, toluene and xylene mixed gas. At room temperature and in the pH range from 6 to 7, when the inlet gas flow was 600 L/h and the apparent liquid velocity was 3.14-3.93 m/h, the biotrickling filter had a good removal effect on formaldehyde, benzene, toluene and xylene mixed gas with the low concentration. The removal rates were over 99%, 73%, 91% and 88%, respectively. The microorganism in the biotrickling filter played an important role in removing formaldehyde. Enrichment tests and the single bacterium contrast show that four of strains have a notable degradation effect. By 16SrDNA sequencing, and physiological and biochemical characteristic identification, it can be confirmed that strain J1 and B4 are Pseudomonas sp., strain JB2 is Bacillus sp., strain E5 is Arthrobacter sp.