摘要
依托厌氧发酵技术处理秸秆和牛粪等木质纤维类废弃物,是资源循环利用的重要方式之一。乳酸和乙酸是厌氧发酵的重要中间产物,是生产沼气、中链脂肪酸等能源化工产品的重要前体物质,但定向生物转化协同生产效率不高、对木质纤维类废弃物协同产乳酸、乙酸机制等问题有待深入探索。本文基于对产酸代谢途径机理的分析,梳理了同步发酵和分步发酵协同产乳酸、乙酸特性,归纳了影响生物转化产酸效率的关键因素,发现在较高含固率15%~20%、接种20%~40%的活性物质和适宜的过程参数[pH为5.0左右、中温和有机负荷5~10kgVS/(m^(3)·d)]下,木质纤维类废弃物具有良好的协同产酸效果。进一步探明物化和生物强化耦合手段对木质纤维素降解和目标产物的促进效应,为开发生物转化乳酸、乙酸协同生产关键技术以及促进秸秆等木质纤维类废弃物高值转化利用提供理论依据。
Anaerobic fermentation technology is one of the critical ways of resource recycling to treat wood lignocellulosic wastes such as straw and cow manure.Lactic acid and acetic acid are essential intermediate products of anaerobic fermentation,and significant precursor substances for the production of biogas,medium chain fatty acids and additional energy chemical products.However,the collaborative production efficiency of directed biotransformation is not elevated,and the mechanism of collaborative production of lactic acid and acetic acid from wood lignocellulosic waste still needs to be further explored.Based on the analysis of the metabolic pathway mechanism of acid production,this paper sorted out the characteristics of simultaneous fermentation and stepwise fermentation in collaborative production of lactic acid and acetic acid and summarized the key factors affecting the efficiency of biological transformation in acid production.It was found that the wood lignocellulosic waste had a favorable synergic acid production effect under high solid content of 15%-20%,inoculation of 20%-40%active substances and appropriate process parameters[pH=5.0,moderate temperature and moderate organic load 5-10kgVS/(m^(3)·d)].In addition,we explored the promoting effect of physicochemical and bio strengthening coupling means on lignocellulosic degradation and target products,which provided a theoretical basis for the development of key technologies for the collaborative production of lactic acid and acetic acid by bioconversion,and the promotion of high-value conversion and utilization of wood lignocellulosic waste such as straw.
作者
黄越
赵立欣
姚宗路
于佳动
李再兴
申瑞霞
安柯萌
黄亚丽
HUANG Yue;ZHAO Lixin;YAO Zonglu;YU Jiadong;LI Zaixing;SHEN Ruixia;AN Kemeng;HUANG Yali(School of Environmental Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei,China;Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Key Laboratory of Low-carbon Green Agriculture in North China,Ministry of Agriculture and Rural Affairs,PRC,Beijing 100081,China;Department of Environmental Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2023年第5期2691-2701,共11页
Chemical Industry and Engineering Progress
基金
国家重点研发计划(2022YFD2002102)
中国农业科学院科技创新工程项目
中央级公益性科研院所基本科研业务费专项(BSRF202204)。
关键词
乳酸
乙酸
厌氧发酵
协同产酸
中链脂肪酸
木质纤维类废弃物
lactic acid
acetic acid
anaerobic fermentation
co-production of acid
medium chain fatty acid
wood lignocellulosic waste
