Improving physicochemical characteristics and anaerobic digestion performance of rice straw via ammonia pretreatment at varying concentrations and moisture levels  

作　　者：Hairong Yuan Ruolin Guan Akiber Chufo Wachemo Yatian Zhang Xiaoyu Zuo Xiujin Li 

机构地区：[1]Centre for Resource and Environmental Research,Beijing University of Chemical Technology,No 15 Beisanhuan East Road,Chaoyang District,Beijing 100029,China [2]Department of Water Supply and Environmental Engineering,Arba Minch University,P.O.Box 21,Arba Minch,Ethiopia [3]Capital Aerospace Machinery Company,Beijing 100076,China

出　　处：《Chinese Journal of Chemical Engineering》2020年第2期541-547,共7页中国化学工程学报（英文版）

基　　金：the funding support from the Tianjin City Science and Technology Planning Project of the People’s Republic of China(grant number 18ZXSZSF00120).

摘　　要：Rice straw physicochemical characteristics and anaerobic digestion(AD)performance via ammonia pretreatment at varying ammonia concentrations(2%,4%,and 6%)and moisture contents(30%,50%,70%,and 90%)under a mild condition were investigated.The results showed that the ammonia pretreatment effectively damaged the rice straw structure,increased the soluble organic concentration,and improved rice straw hydrolysis and AD performance.After pretreatment,the ester bond and ether bond were ruptured in lignocellulose and the volatile fatty acids(VFAs)were within the range of 1457.81–1823.67 mg·L-1.In addition,ammonia pretreatment had high selectivity on lignin removal,resulting in a maximum lignin removal rate of 50.80%.The highest methane yield of rice straw was 250.34 ml·(g VS)-1 at a 4%ammonia concentration coupled with a 70%moisture content,which was 28.55%higher than that of the control.The result showed that ammonia pretreatment of rice straw is technically suitable to enhance AD performance for further application.

关 键 词：Anaerobic digestion AMMONIA PRETREATMENT Rice STRAW PHYSICOCHEMICAL characteristics LIGNOCELLULOSE 

分 类 号：TQ352.62[化学工程]