作物秸秆厢式厌氧消化反应器设计及试验研究

摘要

At present,the anaerobic digestion of crop straw exist the problems of high energy consumption in pretreatment,material stratified crust and nonuniform mixing.A self-designed compartment anaerobic digestion reactor(CADR) was adopted in this study to treat the corn straw at mesophilic temperature.The biogas production,methane content and change of pH were determined.The results showed that the corn straw could undergo anaerobic digestion after two steps of simple pretreatment of cutting and soaking with biogas slurry and with no C/N adjustment.The biogas production reached 19.94 L · d-1 after 30 days with full loading.The gas production rate of raw material TS was 0.495 m3 · kg-1,increased by 30.75％ comparing with conventional batch anaerobic digestion.The pH stabled at 6.5 ～ 7.2.The reactor could obtain fast start-up,stable operation,high gas production rate for corn straw digestion.%目前,以作物秸秆为原料的沼气工程中存在预处理能耗高、料液分层结壳、混合不均匀、出料困难等问题.该研究采用了自行设计的厢式厌氧消化反应器(CADR),测定了玉米秸秆在中温条件下的沼气产量、甲烷含量以及pH的变化情况.结果表明:玉米秸秆未经C/N调节,只经过简单切割和沼液浸泡两步预处理,即可进行有效的厌氧消化,30 d后进人满负荷运行阶段的产气量为19.94 L·d-1,原料TS产气率为0.495 m3· kg-1,比常规粉碎批式厌氧消化产气率提高了30.75％,pH稳定在6.5 ～7.2之间.采用CADR处理玉米秸秆,启动快速、运行稳定、产气率高.