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Weakened adhesion force between extracellular polymeric substances of waste activated sludge caused by rhamnolipid leading to more efficient carbon release
Li, Jiaqi; Liu, Wenzong; Ren, Ruiyun; Xu, Dechun; Liu, Chengyan; Wang, Bo; Wang, Aijie
2019-11-20
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume692Pages:892-902
AbstractRhamnolipid (RL), a biosurfactant produced by bacteria, is investigated to alter the physical characteristics of extracellular polymeric substance (EPS) of waste-activated sludge (WAS), and subsequently promotes hydrolysis and acidogenesis during anaerobic digestion for short chain fatty acids (SCFAs) production. The results revealed that RL could decrease the adhesion force of EPS from 13.46 nN to 1.08 nN, resulting in EPS disintegration layer by layer, decreasing the median particle size by 31.57 mu m and releasing abundant soluble organic matter. The cell number of living bacteria remained stable after RL pretreatment (2.59 x 10(9) vs. 2.66 x 10(9)), indicating that RL has a minimal impact on microbial cells (only similar to 2% bacterial lysis was observed). The kinetic studies of ammonia nitrogen release and SCFA production suggested that, in the RL-pretreated WAS, the reaction rate constants for hydrolysis and acidogenesis were respectively 2-fold and 15-fold higher than those of the control group. (C) 2019 Elsevier B.V. All rights reserved.
Department中国科学院环境生物技术重点实验室
KeywordWaste-activated sludge (WAS) Extracellular polymeric substances (EPS) Rhamnolipid Adhesion force Kinetics
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/43412
Collection中国科学院环境生物技术重点实验室
Affiliation1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Key Lab Environm Biotechnol, 18 Shuangqing Rd, Beijing 100085, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Chinese Acad Sci, Sino Danish Coll, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Li, Jiaqi,Liu, Wenzong,Ren, Ruiyun,et al. Weakened adhesion force between extracellular polymeric substances of waste activated sludge caused by rhamnolipid leading to more efficient carbon release[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,692:892-902.
APA Li, Jiaqi.,Liu, Wenzong.,Ren, Ruiyun.,Xu, Dechun.,Liu, Chengyan.,...&Wang, Aijie.(2019).Weakened adhesion force between extracellular polymeric substances of waste activated sludge caused by rhamnolipid leading to more efficient carbon release.SCIENCE OF THE TOTAL ENVIRONMENT,692,892-902.
MLA Li, Jiaqi,et al."Weakened adhesion force between extracellular polymeric substances of waste activated sludge caused by rhamnolipid leading to more efficient carbon release".SCIENCE OF THE TOTAL ENVIRONMENT 692(2019):892-902.
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