预处理方式对多年生王草厌氧消化性能的影响

Effect of pretreatment methods on biogas production from anaerobic digested King grass

为提高多年生禾本科原料的产气量及产气效率,以华南地区多年生王草为原料,采用批式中温厌氧消化试验,研究了蒸汽加热、超声波和冻融处理对原料厌氧发酵性能的影响,并采用修正Gompertz方程对累积产气量进行拟合分析。结果显示,经过预处理后原料的结晶度明显降低,其中蒸汽加热预处理的结晶度从4.73降至3.29。预处理后产气量明显提高,其中蒸汽加热的产气率为每克挥发性固体产气581.05mL,相对于未处理的原料提高63%。经预处理后王草延滞期分别为1.7、1.8和0.5d,其相对于未经预处理的原料(5.9d)相比明显减少。预处理可明显提高多年生王草的厌氧发酵性能。

In order to improve biodegradability of perennial grass,batch mesophilic anaerobic digestion to produce biogas were conducted using material of King grass from southern China.Modified Gompertz equation was used to fit the cumulative biogas production.The results showed that the crystallinity of raw materials decreased,which decreased from 4.73 to 3.29 when the pretreatment by steam heating.Biogas yield was significantly increased after steam heating pretreatment,and the biogas production rate of 581.05 mL/g VS was achieved,about 63% higher than that of the untreated material.Lag phase were 1.7,1.8 and 0.5 d after preteratment,the lag phase was significantly reduced compared to raw materials without pretreatment（5.9 d）.The pretreatment methods can significantly improve the anaerobic digestion performance of perennial King grass.