[Effect of alkaline treatment on anaerobic digestion of rice straw].
[Effect of alkaline treatment on anaerobic digestion of rice straw].
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发表时间：
2010-09
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通讯作者：
Guangyin Chen;Zheng Zheng-Zheng;Yan Luo;Xing-xing Zou;C. Fang
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作者：
Guangyin Chen;Zheng Zheng-Zheng;Yan Luo;Xing-xing Zou;C. Fang
碱法预处理可以提高稻草厌氧消化的产气量，但由于碱法用量大，增加了成本。为降低秸秆的残留量，采用秸秆碱处理（前处理）、秸秆碱处理（后处理）和秸秆直接消化（对照）3组试验。结果表明：5% NaOH处理48h后，秸秆细胞壁被破坏，COD（化学需氧量）、总氮、NO(3-) - n和NH(4+) - n分别从2 311.11、175.40、5.02和117.82 mg/L提高到10488.89、417.84、248.64和141.44 mg/L；说明碱处理不仅破坏或分解了木质纤维素，还破坏或分解了部分含氮物质。碱处理破坏了木质素的结构，使木质素减少，但纤维素的结晶度指数（C(r)I）由0.592 3提高到0.662 2。厌氧消化结果表明，经厌氧消化处理后，秸秆总固结物减少50.47%，工作量减少，碱性利用率仅为50%。而后处理和预处理的沼气产率分别为添加TS 382.32 mL/g和添加TS 375.84 mL/g。对照木质素含量在预处理和后处理过程中均呈上升趋势，而在处理后则呈下降趋势。厌氧消化后，纤维素的结晶破坏明显，处理后纤维素的结晶和无定形破坏较预处理更为严重。综上所述，秸秆碱后处理用于沼气生产是经济可行的。
The biogas yields of rice straw during anaerobic digestion can be improved by alkaline pretreatment, while it increased the cost because of large amount of alkaline. In order to decrease the amount, 3 sets of experiments were performed using straw with alkaline treatment (pretreatment), digested straw with alkaline treatment (post-treatment) and straw digested directly (control). The results showed that cell wall of straw was destroyed by 5% NaOH treated for 48h, the COD (chemical oxygen demand), total nitrogen, NO(3-) -N and NH(4+) -N were increased from 2 311.11, 175.40, 5.02 and 117.82 mg/L to 10488.89, 417.84, 248.64 and 141.44 mg/L respectively. It suggested that not only lignocellulose but also some nitrogenous materials were destroyed or broken down by alkaline treatment. The lignin structure was destroyed through alkaline treatment that caused the decreased lignin, but the crystallinity index (C(r)I) of cellulose increased from 0.592 3 to 0.662 2. The results of anaerobic digestion showed that the total solid of straw decreased 50.47% after anaerobic digestion treatment leading to less workload and only 50% alkaline used. However, the biogas yield of post-treatment and pretreatment were 382.32 mL/g of TS(added) and 375.84 mL/g of TS(added). Lignin content of control increased while decreased in pretreatment and post-treatment. After anaerobic digestion, crystalline of cellulose was destroyed significantly, and crystalline and amorphous of post-treatment were destroyed more severely than that of pretreatment. From all those mentioned above, post-treatment of straw with alkaline was economical and feasible for biogas production.