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个人信息Personal Information
副教授
博士生导师
硕士生导师
性别：男
毕业院校：明知大学
学位：博士
所在单位：环境学院
学科：环境工程. 环境科学
办公地点：大连理工大学西部校区环境楼 B701
联系方式：Email: zhanglei78@dlut.edu.cn Mobile: 13130499670
电子邮箱：zhanglei78@dlut.edu.cn
Mechanism of process imbalance of long-term anaerobic digestion of food waste and role of trace elements in maintaining anaerobic process stability
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论文类型：期刊论文
发表时间：2019-03-01
发表刊物：BIORESOURCE TECHNOLOGY
收录刊物：SCIE、PubMed、Scopus
卷号：275
页面范围：172-182
ISSN号：0960-8524
关键字：Anaerobic digestion; Food waste; Methane; Trace elements; Methanogenic community; Volatile fatty acids inhibition
摘要：This study investigated mechanism of process imbalance of long-term anaerobic digestion (AD) of food waste (FW) and role of trace elements (TEs) in maintaining process stability. AD of FW was strongly inhibited by volatile fatty acids (VFA, mainly propionate). The deficiency of essential TEs in FW was the fundamental reason. TEs contents in digester gradually decreased with regular substrate feeding and digestate discharge, which greatly limited growth and metabolism of hydrogenotrophic methanogens and Methanosarcina. Finally, Methanosaeta replaced Methanosarcina and became dominant methanogen and hydrogenotrophic methanogens almost disappeared accompanied by declining methanogenic community diversity, which greatly suppressed ecological functions of methanogens and led to propionate inhibition. TEs supplementation eliminated all factors causing process imbalance and significantly enhanced process stability by maintaining strong ecological functions of methanogens via stimulating dominant growth of Methanosarcina (relative abundance between 67.2% and 87.5%), sustaining stable relative abundances of hydrogenotrophic methanogens (about 10%) and enhancing methanogenic community diversity.