Comparison of sodium carbonate-oxygen and sodium hydroxide-oxygen pretreatments on the chemical composition and enzymatic saccharification of wheat straw

Wenhui Geng; Ting Huang; Yongcan Jin; Junlong Song; Hou-Min Chang; Hasan Jameel

doi:10.1016/j.biortech.2014.03.024

Comparison of sodium carbonate-oxygen and sodium hydroxide-oxygen pretreatments on the chemical composition and enzymatic saccharification of wheat straw

Bioresour Technol. 2014 Jun:161:63-8. doi: 10.1016/j.biortech.2014.03.024. Epub 2014 Mar 13.

Authors

Wenhui Geng¹, Ting Huang², Yongcan Jin³, Junlong Song⁴, Hou-Min Chang⁵, Hasan Jameel⁶

Affiliations

¹ Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China; Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695, USA. Electronic address: whgeng8@gmail.com.
² Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China. Electronic address: ht_th_ht@163.com.
³ Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China. Electronic address: jinyongcan@njfu.edu.cn.
⁴ Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China. Electronic address: junlong.song@gmail.com.
⁵ Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695, USA. Electronic address: hchang@ncsu.edu.
⁶ Department of Forest Biomaterials, North Carolina State University, Raleigh, NC 27695, USA. Electronic address: jameel@ncsu.edu.

PMID: 24686372
DOI: 10.1016/j.biortech.2014.03.024

Abstract

Pretreatment of wheat straw with a combination of sodium carbonate (Na2CO3) or sodium hydroxide (NaOH) with oxygen (O2) 0.5MPa was evaluated for its delignification ability at relatively low temperature 110°C and for its effect on enzymatic hydrolysis efficiency. In the pretreatment, the increase of alkali charge (as Na2O) up to 12% for Na2CO3 and 6% for NaOH, respectively, resulted in enhancement of lignin removal, but did not significantly degrade cellulose and hemicellulose. When the pretreated solid was hydrolyzed with a mixture of cellulases and hemicellulases, the sugar yield increased rapidly with the lignin removal during the pretreatment. A total sugar yield based on dry matter of raw material, 63.8% for Na2CO3-O2 and 71.9% for NaOH-O2 was achieved under a cellulase loading of 20FPU/g-cellulose. The delignification efficiency and total sugar yield from enzymatic hydrolysis were comparable to the previously reported results at much higher temperature without oxygen.

Keywords: Alkali-oxygen pretreatment; Enzymatic hydrolysis; Lignin removal; Sugar; Wheat straw.

Publication types

Comparative Study
Evaluation Study
Research Support, Non-U.S. Gov't

MeSH terms

Alkalies
Biofuels*
Carbonates / chemistry
Lignin / chemistry*
Oxygen
Pressure
Sodium Hydroxide / chemistry
Temperature
Triticum / chemistry*

Substances

Alkalies
Biofuels
Carbonates
sodium carbonate
Sodium Hydroxide
Lignin
Oxygen