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| Effect of Pretreatments with NaOH-Green Oxygen at Different Temperatures on Anaerobic Digestion of Wheat Straw |
| Received:June 05, 2015 |
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| KeyWord:green oxygen;combined pretreatment;anaerobic digestion;wheat straw |
| Author Name | Affiliation | E-mail | | LI Xue | College of Agronomy, Northwest A&F University, Yangling 712100, China
The Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling 712100, China | | | ZHANG Tong | College of Agronomy, Northwest A&F University, Yangling 712100, China
The Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling 712100, China | | | ZOU Shu-zhen | College of Agronomy, Northwest A&F University, Yangling 712100, China
The Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling 712100, China | | | YANG Gai-he | College of Agronomy, Northwest A&F University, Yangling 712100, China
The Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling 712100, China | w-xj@nwsuaf.edu.cn | | WANG Xiao-jiao | College of Agronomy, Northwest A&F University, Yangling 712100, China
The Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling 712100, China | | | HAN Xin-hui | College of Agronomy, Northwest A&F University, Yangling 712100, China
The Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling 712100, China | | | REN Guang-xin | College of Agronomy, Northwest A&F University, Yangling 712100, China
The Research Center of Recycle Agricultural Engineering and Technology of Shaanxi Province, Yangling 712100, China | |
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| Abstract: |
| Increasing gas production during straw digestion and reducing the environmental pollution are interesting to both agricultural waste utilization and environmental protection. Here we examined anaerobic digestion performance of wheat straw pretreated by combined 0.05% of Green Oxygen(GO) and different concentrations of NaOH at 3 temperatures, e.g. low temperature(15 ℃), medium temperature(35 ℃) and high temperature(55 ℃). The best pretreatment combinations were found to be 0.05% GO+3% NaOH(A3), 0.05% GO+2% NaOH(B2), and 0.05% GO+2% NaOH(C2) at 15 ℃, 35 ℃ and 55 ℃, respectively. Compared with the control(no pretreatment), cumulative methane gas production increased by 86%, 93% and 87% for 0.05% GO+3% NaOH at 15 ℃, 0.05% GO+2% NaOH at 35 ℃, and 0.05% GO+2% NaOH at 55 ℃, respectively. A significant regression relationship was found between cumulative methane production and NaOH concentration at 35 ℃ and 55 ℃. The scanning electron microscopy showed different degrees of destroy in the structure of cellulose after pretreatments. The structure of cellulose showed separation in thermophilic treatment. Therefore, pretreatments with NaOH-Green Oxygen have significantly stimulated the gas production of wheat straw during anaerobic digestion. |
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