ALKALINE PRETREATMENT AND AIR MIXING FOR IMPROVEMENT OF METHANE PRODUCTION FROM ANAEROBIC CO-DIGESTION OF POULTRY LITTER WITH WHEAT STRAW  

作　　者：Yuanhang ZHAN Jun ZHU Yiting XIAO Leland C.SCHRADER 

机构地区：[1]Department of Biological and Agricultural Engineering,University of Arkansas,Fayetteville,AR 72701,USA

出　　处：《Frontiers of Agricultural Science and Engineering》2023年第3期424-436,共13页农业科学与工程前沿（英文版）

基　　金：funded by USDA/NIFA/AFRI Applied Science and Foundational Program(2019-67021-29945);the authors want to show appreciation for the financial support provided by the United States Department of Agriculture.

摘　　要：Alkaline pretreatment(AL)and air mixing(air)both have the potential to improve anaerobic co-digestion(Co-AD)of poultry litter with wheat straw for methane production.In this study,the effects of the combination of AL(pH 12 for 12 h)and air mixing(12 mL·d^(−1))on the Co-AD process were investigated.The substrate hydrolysis was enhanced by AL,with soluble chemical oxygen demand increased by 4.59 times and volatile fatty acids increased by 5.04 times.The cumulative methane yield in the group of Co-AD by AL integrated with air(Co-(AL+air)),being 287 mL·(g VS_(added))^(−1),was improved by 46.7%compared to the control.The cone model was found the best in simulating the methane yield kinetics with R^(2)≥0.9979 and root mean square prediction error(rMSPE)≤3.50.Co-(AL+air)had a larger hydrolysis constant k(0.14 d^(−1))and a shorter lag phaseλ(0.99 d)than the control(k=0.12 d^(−1),λ=2.06 d).The digestate improved the removal of total solids and total volatile solids by 2.0 and 2.3 times,respectively.AL facilitated substrate degradation,while air can enrich the microbial activity,together enhancing the methane generation.The results show that AL+air can be applied as an effective method to improve methane production from the Co-AD process.

关 键 词：sodium hydroxide air injection cumulative methane yield kinetic modeling analysis DIGESTATE 

分 类 号：O64[理学—物理化学]