Effect of HCl Pretreatment on Anaerobic Digestion of Vegetable Straws
LI Yi☆，YAO Bailun☆，MENG Yan，HAN Rui*
（Qinghai Key Laboratory of Vegetable Genetics and Physiology，Academy of Agriculture and Forestry Sciences，Qinghai University，Xining 810016，Qinghai，China）
Abstract：With cucumber straw，tomato straw and eggplant straw as raw materials，different concentrations of HCl（0.2，0.4，0.6，0.8 mol · L-1）were used as pretreatment reagents to explore the feasibility of HCl pretreatment in anaerobic digestion of vegetable straws．The results showed that HCl pretreatment could significantly increase the cumulative methane yields of vegetable straws，and the treatment of 0.6 mol · L-1 HCl was more economical and suitable．After pretreatment，the cumulative methane yields of cucumber straw，tomato straw and eggplant straw were 167.88，169.94 and 146.81 mL · g-1，which were 12.58%，30.97% and 18.68% higher than that of untreated groups，respectively．HCl pretreatment could effectively degrade cellulose and hemicellulose in vegetable straws，and the higher the oncentration，the greater the degradation rate．Especially，the degradation effect of hemicellulose was best，ranging from 14.08% to 43.68%．
