Enhancing Biogas Production from Anaerobically Digested Wheat Straw Through Ammonia Pretreatment

Aqueous ammonia was used to pretreat wheat straw to improve biodegradability and provide nitrogen source for enhancing biogas production. Three doses of ammonia （2%, 4%, and 6%, dry matter） and three moisture contents （30%, 60%, and 80%, dry matter） were applied to pretreat wheat straw for 7 days. T...

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Bibliographic Details
Published inChinese journal of chemical engineering Vol. 22; no. 5; pp. 576 - 582
Main Author 杨懂艳 庞云芝 袁海荣 陈树林 马晶伟 郁亮 李秀金
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2014
Subjects
ammonia pretreatment
anaerobic digestion
biogas
moisture content
wheat straw
化学成分
厌氧消化
小麦秸秆
氨水
沼气产量
生物降解性
秸秆预处理
纤维素含量
wheat straw
anaerobic digestion
ammonia pretreatment
moisture content
biogas
Online AccessGet full text
ISSN1004-9541
2210-321X
DOI10.1016/S1004-9541(14)60075-6

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Summary:Aqueous ammonia was used to pretreat wheat straw to improve biodegradability and provide nitrogen source for enhancing biogas production. Three doses of ammonia （2%, 4%, and 6%, dry matter） and three moisture contents （30%, 60%, and 80%, dry matter） were applied to pretreat wheat straw for 7 days. The pretreated wheat straws were anaerobically digested at three loading rates （50, 65, and 80 g·L^-1） to produce biogas. The results indi-cated that the wheat straw pretreated with 80%moisture content and 4%ammonia achieved the highest methane yield of 199.7 ml·g^-1 （based on per unit volatile solids loaded）, with shorter digestion time （T80） of 25 days at the loading rate of 65 g·L^-1 compared to untreated one. The main chemical compositions of wheat straw were also ana-lyzed. The cellulose and hemicellulose contents were decomposed by 2%-20%and 26%-42%, respectively, while the lignin content was hardly removed, cold-water and hot-water extracts were increased by 4%-44%, and 12%-52%, respectively, for the ammonia-pretreated wheat straws at different moisture contents. The appropriate C/N ratio and decomposition of original chemical compositions into relatively readily biodegradable substances will improve the biodegradability and biogas yield.
Bibliography:wheat straw, anaerobic digestion, biogas, ammonia pretreatment, moisture content
11-3270/TQ
YANG Dongyan , PANG Yunzhi, YUAN Hairong , CHEN Shulin , MA Jingwei , YU Liang , LI Xiujin （1 Center for Resources and Environmental Research, Beijing University of Chemical Technology, Beijing 100029, China ;2 Beijing Municipal Environmental Monitoring Center, Beijing 100044, China; 3 Department of Biological Systems Engineering, Washington State University at Pullman, WA 99164-6120, USA）
Aqueous ammonia was used to pretreat wheat straw to improve biodegradability and provide nitrogen source for enhancing biogas production. Three doses of ammonia （2%, 4%, and 6%, dry matter） and three moisture contents （30%, 60%, and 80%, dry matter） were applied to pretreat wheat straw for 7 days. The pretreated wheat straws were anaerobically digested at three loading rates （50, 65, and 80 g·L^-1） to produce biogas. The results indi-cated that the wheat straw pretreated with 80%moisture content and 4%ammonia achieved the highest methane yield of 199.7 ml·g^-1 （based on per unit volatile solids loaded）, with shorter digestion time （T80） of 25 days at the loading rate of 65 g·L^-1 compared to untreated one. The main chemical compositions of wheat straw were also ana-lyzed. The cellulose and hemicellulose contents were decomposed by 2%-20%and 26%-42%, respectively, while the lignin content was hardly removed, cold-water and hot-water extracts were increased by 4%-44%, and 12%-52%, respectively, for the ammonia-pretreated wheat straws at different moisture contents. The appropriate C/N ratio and decomposition of original chemical compositions into relatively readily biodegradable substances will improve the biodegradability and biogas yield.
ISSN:1004-9541
2210-321X
DOI:10.1016/S1004-9541(14)60075-6