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响应面法优化香蕉秸秆厌氧发酵产沼气工艺

Optimization of Biogas Production Process by Anaerobic Fermentation of Banana Straw Using Response Surface Methodology
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摘要 为优化香蕉秸秆厌氧发酵产沼气工艺,实现对香蕉秸秆的资源化利用,该研究首先采用单因素试验考察了起始pH、发酵温度、接种物浓度3个因素对香蕉秸秆厌氧发酵总产气量的影响,在此基础上,通过Box-Behnken试验设计及三因素三水平的响应面分析法,对厌氧发酵工艺进行优化。研究结果表明,根据试验数据建立的二次多项式数学模型具有高度显著性(p<0.0001),相关系数R^2=0.9961,说明该模型拟合度、精确度高,数据合理。通过上述试验研究,得到的最佳工艺条件为:起始pH为7.87,发酵温度为39.45℃,接种物浓度为72.61%。在此条件下,香蕉秸秆厌氧发酵总产气量的预测值为18017.20mL,试验值为17816.40mL,二者相对偏差为1.11%。因此,所得模型能够很好地优化香蕉秸秆厌氧发酵的条件并预测总产气量,可为提高香蕉秸秆厌氧发酵产气量及发酵效率提供一定的参考。 The purpose of the study is to optimize the conditions of anaerobic fermentation and realize the resource utilization of banana straw.In this study,the effects of initial pH value,fermentation temperature,inoculum concentration on the total biogas production of anaerobic fermentation were investigated by single factors experiments.On the basis of this,the Box-Behnken design experiments and response surface methodology with three factors and three levels were used in the optimization of anaerobic fermentation technology.The results showed that the quadratic regression mathematics model established according to experimental data was highly significant(P<0.0001),the correlation coefficient R^2 was 0.9961,indicating that the regression models were fitted well with experimental data and had a high accuracy.The data were reasonable with low errors.The optimum conditions for anaerobic fermentation of banana straw were determined as follows:the initial pH value was 7.87,the fermentation temperature was 39.45℃,the inoculum concentration was 72.61%.Under these conditions,the predicted total biogas production was 18017.20mL,while the experimental value was 17816.40mL,and the relative deviation was 1.11%.Therefore,the model can well optimize the conditions of anaerobic fermentation of banana straw and predict the total biogas production.This study can provide references for improving biogas production and fermentation efficiency of banana straw.
作者 李桃 王纪坤 黄宇钊 冼萍 U Tao;WANG Ji-kun;HUANG Yu-zhao;XIAN Ping(College of Resources,Environment&Materials,Guangxi University,Nanning 530004,China)
出处 《四川环境》 2020年第1期17-23,共7页 Sichuan Environment
基金 广西自然科学基金项目(2016GXNSFAA380294)
关键词 香蕉秸秆 厌氧发酵 沼气 响应面法 Banana straw anaerobic fermentation biogas response surface methodology
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