氨水与冻融复合改性玉米秸秆对其高温厌氧消化过程的影响  

Effect of Ammonia and Freezing-thawing Modificated Corn Stalk on Its Thermophilic Anaerobic Digestion Performance

作　　者：李娟 左晓宇[1] 袁海荣[1] 李秀金[1] LI Juan;ZUO Xiao-yu;YUAN Hai-rong;LI Xiu-jin(Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;Beijing Municipal Environmental Monitoring Center, Beijing 100048, China)

机构地区：[1]北京化工大学环境科学与工程系,北京100029 [2]北京市环境保护监测中心,北京100048

出　　处：《中国沼气》2020年第5期17-23,共7页China Biogas

基　　金：国家科技支撑计划(2018YFC1900903)。

摘　　要：文章采用CSTR高温反应器进行改性玉米秸秆厌氧消化实验,观察3个有机负荷(1.6,1.8和2.0 g·L^-1d-1)阶段下高温厌氧消化产甲烷性能变化和过程指标变化。实验结果表明,氨-冻融组玉米秸秆高温厌氧消化产甲烷性能最好,其单位VS产甲烷量在3个有机负荷条件下分别为314,309和306 mL·g-1vs,比未处理组分别提高了16.1%,19.3%和22.6%,比水-冻融提高了8.9%,10.6%和13.8%。且随着有机负荷的提高,3个高温系统厌氧消化过程指标(挥发性脂肪酸、pH值、氨氮、碱度和溶解性COD)值呈现出了一定的规律,且稳定性均良好,其中,氨-冻融组厌氧消化系统过程中氨氮值为658~1148 mg·L^-1,未达到抑制值。因此,对于工程应用来说,氨-冻融复合改性可作为提高玉米秸秆厌氧消化产甲烷量和生物降解性的一种重要方式。The anaerobic digestion(AD)experiment of modified corn stalk(CS)was carried out with high temperature thermophilic CSTR reactor.The changes of methanogenic performance and process index under three organic loading(1.6,1.8 and 2.0 g·L^-1d-1)were investigated.The results showed that the ammonia-freezing-thawing treated corn straw had the best performance under high temperature anaerobic digestion condition.The unit VS methane production under the three organic loading conditions was 314,309 and 306 mL·g-1vs,respectively,which was 16.1%,19.3%and 22.6%higher than that of the untreated group,and 8.9%,10.6%and 13.8%higher than that of water-freezing-thawing group.With the increase of organic load,the three process indexes(volatile fatty acid,pH value,ammonia nitrogen,alkalinity and soluble COD)in the system showed certain regularity and good stability.Among them,the ammonia nitrogen in the ammonia-freezing-thawing group was 658~1148 mg·L^-1,which was below the inhibition level.Therefore,for engineering applications,ammonia-freezing-thawing modification can be used as a way to increase the methane production and biodegradability of CS.

关 键 词：玉米秸秆 高温 厌氧消化 过程指标 

分 类 号：S216.4[农业科学—农业机械化工程] X712[农业科学—农业工程]