| NaOH处理对互花米草高温干式厌氧发酵的影响 |
| 摘要点击 2749 全文点击 1705 投稿时间：2010-08-16 修订日期：2010-09-20 |
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| 中文关键词 碱处理 互花米草 高温干式发酵 沼气 抑制作用 |
| 英文关键词 NaOH-treatment Spartina alterniflora dry-thermophilic anaerobic digestion biogas inhibition |
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| 中文摘要 |
| 为了解NaOH处理对互花米草厌氧发酵的影响,在高温（55℃±1℃）和互花米草初始干物质含量为20%条件下,考察了NaOH处理对互花米草厌氧发酵产气特性、物质结构和组成以及发酵后互花米草水浸提液理化特性的影响.结果表明,互花米草经5% NaOH处理后,产气受到明显的抑制,累积产气量仅为CK的76.68%；碱处理配合水洗可有效避免这种抑制,累积产气量较对照提高了11.78%；实验过程中,CK和碱+水洗的甲烷含量稳定,碱处理的波动较大,但碱处理对提高甲烷含量有一定的促进作用,甲烷平均含量提高了5.30%；经51 d的厌氧处理后,互花米草中半纤维素和纤维素含量下降,木质素的含量增加,碱处理纤维素的结晶度增加,不利于纤维素的分解,这与FTIR的结果一致；碱处理破坏了互花米草的物质结构,有利于有机物的溶出,但带入的高浓度Na+是影响互花米草厌氧发酵的主要因素.因此,NaOH处理不适合作为互花米草这类盐生植物厌氧生物利用的预处理方式. |
| 英文摘要 |
| In order to improve the biotransformation rate of lignocellulosic materials, sodium hydroxide (NaOH) was widely used to pretreat lignocellulosic materials. Effect of NaOH-treatment on dry-thermophilic anaerobic digestion of Spartina alterniflora was studied by batch model under the temperature of 55℃±1℃, at the initial total solid loading (TSL) of 20%. The results indicated that biogas production was inhibited by NaOH-treatment and improved by NaOH-treatment with water washed. The cumulative biogas yield of control (CK), NaOH-treated and NaOH-treated with water washed (NaOH+water) were 268.35 mL/g, 205.76 mL/g and 299.97 mL/g, respectively. The methane content of CK and NaOH+water treatments kept stable while fluctuation of NaOH-treated treatment during anaerobic digestion process was observed. Compared with CK and NaOH+water treatments, methane content of NaOH-treated treatment was improved by 5.30%. The content of hemi-cellulose and cellulose of S.alterniflora decreased while content of lignin of S.alterniflora increased after 51-day anaerobic digestion. The crystallinity of cellulose of S.alterniflora increased after NaOH-treatment which was consistent to the result of FTIR. The lignocellulosic structure was destroyed and the biodegradability of S.alterniflora was increased by NaOH pretreatment. However, the amount of Na+ was taken into the anaerobic system, besides the high Na+ content in the plant itself which inhibited the anaerobic microorganisms. Therefore, NaOH-treatment is considered to be unsuitable for the anaerobic digestion of S.alterniflora. |
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