【作者】 罗庆明；

【导师】 李秀金；

【作者基本信息】 北京化工大学 ， 环境工程， 2005， 硕士

【摘要】 我国年产作物秸秆约7亿吨左右,部分秸秆由于得不到有效的利用,或闲置田间地头或露天燃烧,既是一种资源的浪费,又对环境造成了非常不利的影响。 本文提出厌氧生物气化的方法处理玉米秸秆,通过预处理和负荷率的研究改进了生物气化效率。使用NaOH对玉米秸秆化学预处理,其添加比例分别是玉米秸秆干物质质量的4%、6%、8%和10%;随后在35g/L、50g/L、65g/L和80g/L四个负荷率下厌氧消化实验。记录每天的各组玉米秸秆产气量,并计算累积产气量,测算反应前后的TS、VS变化情况。 实验结果表明,四组NaOH处理玉米秸秆中,6%、8%和10%三者在累积产气量和TS、VS减少方面都取得了较好的结果且相互差别不大。相同负荷率下做比较发现,各个负荷率下的累积产气量最大值分别为8%、10%、6%和8%NaOH处理玉米秸秆获得;6%NaOH处理玉米秸秆在四个负荷率下的累积产气量和以上各个最大值相差分别为3.6%、2.6%、0%和4.1%。同样在相同负荷率下对TS和VS消化率做比较,各个负荷率下的最大值分别为8%、6%、10%和8%NaOH处理玉米秸秆获得;6%的TS消化率和以上最大值相差为0%～11.6%,VS消化率相差为0%～19.3%。综合以上结果并结合经济可行性的角更多还原

【Abstract】 China is one of the largest agricultural countries in the world with 0.7 billion tons of crop stalks being generated annually. However, the com stalks can not be utilized efficiently and environmentally. Anaerobic biogasification of com stalk was studied in this research.NaOH pretreatment was employed in order to improve anaerobic biodegradability and biogas yield of com stalk. NaOH amount added was 4%、 6%、 8% and 10% of dry matter of corn stalk. The untreated and NaOH-treated com stalks were then anaerobically digested at mesophilic temperature (35℃) in batch reactors. For each com stalk, four loading rates of 35, 50, 65 and 80g/L were used.As for the four groups of NaOH-treated corn stalks, the cumulative biogas production obtained the highest value at 8%, 10%, 6% and 8% for the four loading rates respectively. The growth rates for TS and VS reduction of NaOH-treated corn stalks achieved peak values at 8%, 6%, 10% and 8% respectively. The difference among values above for 6%, 8% and 10% are negligible, thus 6% is recommended as the best addition amount for NaOH pretreatment.The experimental results of NaOH-treated for the four loading rates更多还原