Reduction in environmental impact of sulfuric acid hydrolysis of bamboo for production of fuel ethanol

- Effluent from biological treatment of stillage could be reused to recover sugar from residue.
- Rinse water and recovered sulfuric acid could be reused in the saccharification process.
- Condensate without acetate could be reused as elution water in acid-sugar separation.
- 86.3% of the process water and 77.6% of the sulfuric acid could be recycled.
- Environment impact was reduced by reuse of stillage and sulfuric acid.