Enhance Biogas Production of Corn Stover Pretreated with Sodium Hydroxide
The biogas yield of corn stover during anaerobic digestion can be substantially increased through wet-solid-state sodium hydroxide (NaOH) pretreatment. The mechanisms of biogas yield enhancement through wet-solid-state NaOH pretreatment were also explored. Compared to the untreated corn stover, the biogas production of 2%, 4% and 6% NaOH pretreated corn stovers were all enhanced significantly at four loading rates, especially 2% NaOH-treated stover digested at the loading rate of 65g L-1 achieved 72.9% more biogas, 73.4% more methane and 34.6% shorter technical digestion time than the corresponding untreated one. The biodegradability of the corn stover was the changes of the chemical compositions during NaOH pretreatment process. The higher doses of NaOH used,the more chemical compositions were destroyed. The contents of lignin, cellulose, and hemicellulose decreased, considerable proportion of which were converted to soluble substances as indicated by a 27.1~77.1% increase of water-soluble extractives in the NaOH-treated corn stovers. However, the potentially toxic materials of Na+ and soluble hydroxylated aromatics may depress the overall biodegradability of the treated lignocellulose.Based on comprehensive consideration of cost of pretreatment, biological conversion efficiency and the inhibition, the NaOH dose of 2%, three days of pretreatment time and TS12% were recommended for pretreatment and the loading rate of 65g L-1 for anaerobic digestion.
anaerobic digestion biogas wet-solid-state NaOH pretreatment chemical structure.
Mingxia Zheng Xiujin Li Laiqing Li Yanfeng He
Department of Environmental Science and Engineering, Beijing University of Chemical Technology,Beijing,P.R.China,100029
国际会议
The 3rd International Conference on Waste Management and Technology(第三届固体废物管理与技术国际研讨会)
北京
英文
364-375
2008-11-05（万方平台首次上网日期，不代表论文的发表时间）