| NaOH处理对互花米草深度气化利用的影响 |
| 摘要点击 2710 全文点击 1879 投稿时间：2010-09-23 修订日期：2010-11-29 |
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| 中文关键词 NaOH处理 互花米草 深度气化 厌氧消化 沼气 |
| 英文关键词 NaOH-treatment Spartina alterniflora advanced anaerobic biogasification anaerobic digestion biogas |
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| 中文摘要 |
| 在实验室条件下,考察了NaOH固相处理用于互花米草中温干式发酵以及一次发酵后沼渣二次发酵的预处理方式的可行性,从产气特性、物质转化等角度进行了系统的分析.结果表明,NaOH处理对互花米草中温干式发酵产气未表现出促进作用,干物质（TS）产气量为358.94 mL/g,仅为CK的92.42%,但甲烷平均含量提高了1.84%；互花米草一次发酵后的沼渣经5%的NaOH溶液固相处理48 h后用于进行中温湿式二次发酵实验,TS产气量为209.73 mL/g,甲烷平均含量为70.78%,厌氧生物转化率仅为23.29%；二次发酵的类型为丙酸型发酵,实验过程中未出现酸化现象；经二次发酵后,纤维素含量大幅降低,木质素被相对浓缩,半纤维素含量稍有增加,FTIR和XRD的结果与常规分析的结果一致.综合以上结果认为,互花米草一次发酵后的沼渣仍具有很大的产气潜力,NaOH可作为其深度气化利用的预处理方式. |
| 英文摘要 |
| In order to improve the biotransformation rate of Spartina alterniflora, effect of NaOH-treatment on anaerobic dry-mesophilic digestion of Spartina alterniflora and feasibility of NaOH-treatment as a pretreatment of biogas residues of Spartina alterniflora for advanced anaerobic biogasification were conducted under lab-scale conditions. The results indicated that there was less improvement to biogas yield with NaOH-treatment and the cumulative biogas yield of Spartina alterniflora was 358.94 mL/g TS which was 92.42% to that of control (CK). However, the average methane content was improved slightly with 1.84% improvement. After solid-state pretreatment with 5% NaOH solution for 48 h, the biogas residue of Spartina alterniflora was used for advanced biogasification. This experiment was conducted under 35℃±1℃ with initial total solid loading of 8%. The cumulative biogas yield was 209.73 mL/g TS with 70.78% of average methane content, but the biotransformation rate was only 23.29% which was much lower than that of Spartina alterniflora. The fermentation type was propionic acid type fermentation. After two-phase fermentation treatment, cellulose content was decreased significantly while lignin and hemicellulose content were increased. The crystalinity of cellulose of biogas residue decreased after two-phase anaerobic fermentation which was consistent to result of FTIR. The comprehensive analysis of experiment indicated that biogas residue of Spartina alterniflora was still a good material for biogas production and NaOH-treatment was a good pretreatment for biogas production. |
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