Enhanced butanol production by solvent tolerance Clostridium acetobutylicum SE25 from cassava flour in a fibrous bed bioreactor.

•AquaMats AO was used as the immobilization carrier in ABE fermentation.•The butanol-producing ability of the producing strain SE25 was fairly stable.•The FBB system is a promising approach for enhancing the butanol productivity.•The correlation between the biofilm and solvent tolerance was investigated.