为了降低玉米秸秆碱预处理过程中药剂的成本,探究了气吹脱沼液辅助CaO(投加量3%、5%、6%和8%)联合预处理对玉米秸秆厌氧消化产甲烷性能的影响,并与未气吹脱沼液辅助CaO预处理进行对比。结果表明,相比未气吹脱沼液辅助CaO和未预处理组,气吹脱沼液辅助CaO联合预处理组能获得最高的木质素降解率和累积甲烷产量,其中气吹脱沼液辅助8% CaO联合预处理组的累积甲烷产量达到209.24 mL/g VS,较未预处理组(124.27 mL/g VS)提高68.36%。工程经济分析表明,气吹脱1 h高温厌氧沼液辅助3% CaO联合预处理组能在最低CaO投加量下获得最高利润达533.47元/t秸秆,较未预处理组提高50.30%。

In order to reduce the cost of chemicals used in the alkaline pretreatment of corn straw,the effect of the combined pretreatment by CaO (with dosages of 3%,5%,6% and 8%) assisted with aerating biogas slurry on the methane production from anaerobic digestion of corn straw is investigated,and compared with the pretreatment without aerating biogas slurry.It is indicated that the highest lignin degradation rate and cumulative methane production are obtained in the combined pretreatment group compared to the group without any pretreatment and the group pretreated by CaO alone.In particular,the cumulative methane yield by the combined pretreatment group is 209.24 mL/g_VS,68.36% higher than that (124.27 mL/g_VS) by the group without any pretreatment.It is shown through engineering economic analysis that the maximum profit of 533.47 RMB per ton of corn straw can be obtained with the lowest CaO dosage when high temperature anaerobic biogas slurry has been aerated for 1 hour combining with 3% CaO pretreatment,which represents an increase of 50.30% compared to the group without any pretreatment.

许城(1998-),男,硕士生,研究方向为生物质资源化利用。