Fractionation of Forest Residues of Douglas-Fir for Fermentable Sugar Production by SPORL Pretreatment

International Congress on Energy (ICE)
AIChE Annual Meeting
October 31, 2012 - 4:05pm-4:30pm
Douglas-fir (Pseudotsuga menziesii) forest residues were physically fractionated through sieving.  The bark and wood were separated for large-sized fractions (>12.7 mm) and their contents were determined.  The chemical compositions of the large fractions were calculated based on the contents and chemical compositions of the bark and wood. The chemical compositions of the fine fractions were analyzed.  The bark and wood content in the fine fractions were calculated based on the measured glucan and lignin contents in each fraction.  It was found that fractionation by particle/chip size can effectively fractionate bark and wood and therefore lignin from carbohydrates.  The large sized-fractions (>12.7 mm) represent approximately 60% of the collected forest residues but only contain approximately 37% of the total bark and 35% of the total ash, or a selectivity over bark and ash of 1.6 and 1.7, respectively.  Pretreatment of forest residues by Sulfite Pretreatment to Overcome Recalcitrance of Lignocelluloses (SPORL) and subsequent enzymatic hydrolysis revealed the presence of 14.3% bark can reduce substrate enzymatic digestibilities (SED) 16% compared with that from a bark free sample.  The SED of a bark is 41% compared with 73% for wood when pretreated under the same conditions. Separating pretreatment of bark from wood is beneficial for producing a more enzymatically digestible substrate.  The results from the present study could have significant implications for harvesting forest residues.     
Professional Development Hours
0.5 PDHs
You will be able to download and print a certificate for these PDH credits once the content has been viewed. If you have already viewed this content, please click here to login.

Would you like to access this content?

No problem. You just have to complete the following steps.

You have completed 0 of 2 steps.

  1. Log in

    You must be logged in to view this content. Log in now.

  2. Purchase Technical Presentation

    You must purchase this technical presentation using one of the options below.
    If you already purchased this content recently, please click here to refresh the system's record of ownerships.


Credits 0.5 Use credits
List Price $25.00 Buy now
AIChE Members $15.00 Buy now
AIChE Undergraduate Student Members Free Free access
AIChE Graduate Student Members $15.00 Buy now
Related Topics: