Pretreatment of wheat straw with potassium hydroxide for increasing enzymatic and microbial degradability

Bioresource Technology
Xiaoying LiuRuihong Zhang

Abstract

The pretreatment of wheat straw with potassium hydroxide (KOH) at ambient temperature (20°C) was investigated. The pretreatment effects on chemical composition and physical structures, and subsequent enzymatic hydrolysis and anaerobic digestion were evaluated. Wheat straw at 10% total solids (TS) was treated with KOH solution for 24h at a wide range of KOH loadings from 2% to 50% (w/w dry basis). Higher KOH loading resulted in higher lignin reduction from the straw and chemical oxygen demand (COD) in the resulting black liquor. Maximum lignin reduction of 54.7% was observed at 50% KOH loading. In comparison to untreated straw, specific hydrolysis yields achieved 14.0-92.3% over the range of 2-50% KOH loading, and methane yields increased 16.7-77.5% for KOH loadings of 10-50%, respectively. Accounting for losses during pretreatment, 20% KOH loading resulted in maximum overall reducing sugar yield and methane yield and therefore is the recommended loading for pretreatment under these conditions.

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Citations

Apr 14, 2017·The Science of the Total Environment·Maycoll Stiven Romero-GüizaBelén Fernández
Apr 29, 2020·Environmental Science and Pollution Research International·Jelica NovakovicMaria Loizidou
Jun 30, 2019·Environmental Science and Pollution Research International·Habiba KhalidChang Chen
May 3, 2021·Environmental Science and Pollution Research International·Gurraj SinghDanil Yu Pimenov

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