Efficient bio-deodorization of thioanisole by a novel bacterium Brevibacillus borstelensis GIGAN1 immobilized onto different parking materials in twin biotrickling filter

• A thioanisole-utilizing bacterium was successfully isolated and identified.
• Performance of a twin BTF for thioanisole removal was compared in detail.
• Higher RE and EC was obtained in these two BTF than previous reports.
• Long-term performance of BTF was discussed by measuring pressure drop and biomass.
• The thioanisole degradation pathways and deodorization mechanism were proposed.

Biological treatment of odorous gas is an alternative to conventional physicochemical processes. A newly-isolated and identified Brevibacillus borstelensis GIGAN1 was seeded on active carbon (AC) and ceramic particle (CP) in a twin biotrickling filter (BTF) to comparatively probe the removal performance of gaseous thioanisole, respectively. At empty bed residence time (EBRT) of 66 s, 100% of thioanisole (⩽3 mg L−1) could be removed on AC; while 100% of thioanisole could only be achieved for ⩽1.2 mg L−1 on CP. Further increase thioanisole concentration to 3 mg L−1, higher elimination capacity was obtained on AC (162.51 g m−3 h−1) than CP (139.93 g m−3 h−1). Further, longer EBRT was also beneficial to thioanisole removal. Additionally, the biomass accumulation did not lead to the column clogging. The bio-deodorization mechanism of thioanisloe were also tentatively proposed. Overall, an unprecedented performance could be achieved by the novel GIGAN1 in BTF for thioanisole biodegradation.

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