期刊
WATER RESEARCH
卷 169, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2019.115223
关键词
Anammox; Biofilm; Extracellular polymeric substances (EPS); Structure; Nitrogen removal
资金
- National Natural Science Foundation of China [51778446, 51522809]
- Foundation of the State Key Laboratory of Pollution Control and Resource Reuse (Tongji University, China) [PCRRY 0400231010]
Anammox bacteria tend to self-aggregate, and biofilm-based anammox processes are widely used as sustainable alternative methods for nitrogen removal from wastewater. However, the mechanism for the initial adhesion of anammox bacteria remains unclear. In this work, extracellular polymeric substances (EPS) were extracted separately from anammox granules and then characterized by multi-methods. The adhesion properties of anammox consortia to biotic and abiotic surfaces were examined separately before and after the extraction of three stratified EPS, using aggregation assays and a quartz crystal microbalance technique with dissipation monitoring, respectively. The extraction of each of the three stratified EPS gradually increased the initial aggregation of anammox consortia from 77.6 +/- 3.0% to 85.2 +/- 2.6%. Fourier transform infrared spectrometry confirmed that the aggregation of anammox consortia depended largely on the interactions between functional groups on the cell surfaces. All three stratified EPS had positive effects on the initial adhesion rate and mass of anammox consortia to abiotic surfaces. More importantly, the structure of the adhered layer was more compact before the extraction of each of the three stratified EPS. We therefore hypothesized that the initial adhesion among anammox consortia was due to the ability of the anammox bacteria to express adhesion molecules on the bacterial surfaces and that the three stratified EPS were excreted to adhere inert particulates and form a compact biofilm structure. This study clarifies the role of stratified EPS on the initial formation of anammox biofilms and provides a theoretical basis for accelerating the formation of anammox biofilms. (C) 2019 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据