Pretreatment of wheat straw with potassium hydroxide for increasing enzymatic and microbial degradability
| Autor: | Guangqing Liu, Ruihong Zhang, Steven M. Zicari, Yeqing Li, Xiaoying Liu |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Environmental Engineering
Potassium Compounds Inorganic chemistry Dry basis Bioengineering chemistry.chemical_compound Hydrolysis Bacteria Anaerobic Enzymatic hydrolysis parasitic diseases Hydroxides Waste Management and Disposal Triticum Potassium hydroxide Renewable Energy Sustainability and the Environment Chemical oxygen demand food and beverages General Medicine Straw Plant Components Aerial Enzyme Activation Anaerobic digestion Biodegradation Environmental chemistry Methane Black liquor Nuclear chemistry |
| Zdroj: | Bioresource technology. 185 |
| ISSN: | 1873-2976 |
| Popis: | 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 24 h 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. |
| Databáze: | OpenAIRE |
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