Effect of dilute acid hydrolysis pretreatment on the enzymatic saccharification of wheat straw handling residue

doi:10.3969/j.issn.1000-2006.2015.04.024

LYU Jiaqing, BI Yanjin, YAN Xixi, JIN Yongcan

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2015, Vol. 39 ›› Issue (04) : 137-142.

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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2015, Vol. 39 ›› Issue (04) : 137-142. DOI: 10.3969/j.issn.1000-2006.2015.04.024

Effect of dilute acid hydrolysis pretreatment on the enzymatic saccharification of wheat straw handling residue

LYU Jiaqing¹, BI Yanjin², YAN Xixi¹, JIN Yongcan^1*

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Abstract

The wheat straw handling residue produced in pulp mills are difficult to be utilized efficiently and economically due to the complicated composition and large quantities. However, as a cheap lignocellulosic material, the utilization of the residue to produce fuel ethanol offers a great potential for reducing solid waste emission and producing great economic benefits. The effects of dilute acid hydrolysis pretreatment on chemical composition and enzymatic saccharification of wheat straw handling residue were investigated. The results showed that the sugar conversion of enzymatic saccharification was low after auto-hydrolysis pretreatment at 170 ℃. The addition of dilute sulfuric acid in the pretreatment was beneficial to enhance the enzymatic saccharification. The sugar conversion of unwashed pretreated wheat straw handling residue was higher than that of washed one. The total sugar conversion of unwashed pretreated materials increased with the increase dosage of sulfuric acid, and then it decreased with the continuous increasing charge. The glucan and xylan conversion reached up to 71.9% and 73.9%, respectively, and the total sugar conversion reached the maximum(closed to 70%), for the substrate with pre-hydrolysis(0.32% H₂SO₄, 170 ℃)and PFI refining(8 000 revolutions), hydrolyzed at a cellulase loading of 20 μmol/(min·g).

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LYU Jiaqing, BI Yanjin, YAN Xixi, JIN Yongcan. Effect of dilute acid hydrolysis pretreatment on the enzymatic saccharification of wheat straw handling residue[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2015, 39(04): 137-142 https://doi.org/10.3969/j.issn.1000-2006.2015.04.024

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