生态环境学报2018，Vol.27Issue(1)：18-23,6.DOI:10.16258/j.cnki.1674-5906.2018.01.003
尿素氨化预处理对稻秆厌氧发酵产气特性的影响
Effect of Urea Ammoniation Pretreatment on Anaerobic Fermentation Characteristics of Rice Straw
摘要
Abstract
As an important biomass resource, rice straw is used for biogas produced by anaerobic fermentation, which is one way advocated greatly in China for waste treatment of biomass solid. However, the complicated wood fiber structure of rice straw makes it hard to digest and utilize anaerobic bacteria, which leads to the low efficiency of anaerobic fermentation. In order to improve the efficiency of anaerobic fermentation of rice straw, the study used the urea with different mass fractions (3%, 4.5% and 6%) to pretreat ammoniation on rice straw and an environmental scanning electron microscopy (SEM) and video optical contact angle locator was adopted to observe the rice straw morphological structure and hydrophilicity before and after the pretreatment so as to find out the internal effects of pretreatment on the biogas producing efficiency and investigate the effects of the urea ammoniation pretreatment with various mass fractions on biogas producing characteristics from anaerobic fermentation of rice straw. SEM results showed that the pretreatment could break the dense structure of rice straw and increased the action area of microbe. The images of the contact angles showed that the urea ammoniation pretreatment had destroyed the wax layer on the surface of the rice straw. The hydrophobic surface was changed into the hydrophilic one, making it easier to be used by microorganisms, which explained that the change of lignocellulosic structure in rice straw was the internal reason of affecting the biogas producing efficiency. Compared with other experimental groups, it was found that the urea ammoniation pretreatment with 4.5% mass fractionhad the optimal effect on biogas production, and the cumulative gas production reached 17 053 mL, which was 50.67% higher than that of the control group and relatively shortened the gas production cycle.关键词
氨化/预处理/水稻秸秆/厌氧发酵Key words
ammoniation/pretreatment/rice straw/anaerobic fermentation分类
资源环境引用本文复制引用
丁绍兰,张敏娜,黄振侠,吁安,张咪,龚贵金..尿素氨化预处理对稻秆厌氧发酵产气特性的影响[J].生态环境学报,2018,27(1):18-23,6.基金项目
国家科技支撑计划课题(2014BAC04B02) （2014BAC04B02）
江西现代农业科研协同创新项目(JXXTCX2016003) （JXXTCX2016003）
