Mirmohamadsadeghi Safoora, Karimi Keikhosro, Zamani Akram, Amiri Hamid, Horváth Ilona Sárvári
Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran ; Industrial Biotechnology Group, Institute of Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Biomed Res Int. 2014;2014:350414. doi: 10.1155/2014/350414. Epub 2014 Aug 5.
Organosolv pretreatment was used to improve solid-state anaerobic digestion (SSAD) for methane production from three different lignocellulosic substrates (hardwood elm, softwood pine, and agricultural waste rice straw). Pretreatments were conducted at 150 and 180(°)C for 30 and 60 min using 75% ethanol solution as an organic solvent with addition of sulfuric acid as a catalyst. The statistical analyses showed that pretreatment temperature was the significant factor affecting methane production. Optimum temperature was 180(°)C for elmwood while it was 150(°)C for both pinewood and rice straw. Maximum methane production was 152.7, 93.7, and 71.4 liter per kg carbohydrates (CH), which showed up to 32, 73, and 84% enhancement for rice straw, elmwood, and pinewood, respectively, compared to those from the untreated substrates. An inverse relationship between the total methane yield and the lignin content of the substrates was observed. Kinetic analysis of the methane production showed that the process followed a first-order model for all untreated and pretreated lignocelluloses.
采用有机溶剂预处理来改进固态厌氧消化（SSAD），以实现从三种不同木质纤维素底物（硬木榆树、软木松树和农业废弃物稻草）中生产甲烷。使用75%乙醇溶液作为有机溶剂，并添加硫酸作为催化剂，在150和180℃下分别进行30和60分钟的预处理。统计分析表明，预处理温度是影响甲烷产量的重要因素。榆树的最佳温度为180℃，而松木和稻草的最佳温度为150℃。每千克碳水化合物（CH）的最大甲烷产量分别为152.7、93.7和71.4升，与未处理底物相比，稻草、榆树和松木的甲烷产量分别提高了32%、73%和84%。观察到底物的总甲烷产量与木质素含量之间呈反比关系。甲烷生产的动力学分析表明，所有未处理和预处理的木质纤维素的过程均遵循一级模型。
