Article

Applied Biochemistry and Biotechnology

, Volume 77, Issue 1, pp 117-125

Steam explosion of straw in batch and continuous systems

  • Francesco ZimbardiAffiliated withENEA, Italian Agency for New Technology Energy and the Environment, Renewable Energy Division Email author 
  • , Donato ViggianoAffiliated withENEA, Italian Agency for New Technology Energy and the Environment, Renewable Energy Division
  • , Francesco NannaAffiliated withENEA, Italian Agency for New Technology Energy and the Environment, Renewable Energy Division
  • , Mario DemicheleAffiliated withENEA, Italian Agency for New Technology Energy and the Environment, Renewable Energy Division
  • , Daniela CunaAffiliated withENEA, Italian Agency for New Technology Energy and the Environment, Renewable Energy Division
  • , Giovanni CardinaleAffiliated withENEA, Italian Agency for New Technology Energy and the Environment, Renewable Energy Division

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Abstract

The effects of the steam-explosion treatment on aqueous fractionation and bioconversion of wheat straw have been investigated. The treatments have been carried out in batch and continuous reactors with capacity of 0.5 Kg/cycle and 150 Kg/h, respectively. The exploded materials have been sequentially extracted with water at 65°C and sodium hydroxide 1.5%. Analytical determinations of liquid fractions and solid residues haveled to the fractionation pattern of the carbohydrates as, monomers, oligomers, and polymers. Evaluations of total acidity, ash content, and lignin recovery have improved understanding of the process. This part of the work has allowed us to derive: the empiric relationship between the batch and the continuous reactors and the yield and availability of pentoses and hexoses in various phases. Selected samples have been tested in enzymatic-hydrolysis experiments, pointing out the effect of treatment severity and reactor used on the saccharification yield.

Index Etries

Enzymatic hydrolysis steam explosion straw