Enhancing removal performance of ortho xylene by adding polydimethylsiloxane into two-stage biofilter

[Display omitted] •The 0.5 % polydimethylsiloxane addition enhanced removal efficiency to 85 %.•Fungal biofilter had higher degradation ability compared to bacterial biofilter.•The biofilters evolved into a co-degradation system.•Sphingomonas and Sphingobium were the dominant bacterial species.•Fusa...

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