Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 624, Issue -, Pages 1013-1022Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2017.12.248
Keywords
Exogenous AHLs; Microbial adhesion; High ammonia nitrogen wastewater; Biocarrier
Categories
Funding
- Jiangsu Natural Science Foundation [BK20160655]
- National Natural Science Foundation of China [51608254]
- Jiangsu Science and Technology Projects [BE2017632, BA2016012]
- National Science and Technology Major Project [2017ZX07204001]
- Fundamental Research Funds for the Central Universities [021114380046]
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Startup of biofilm process triggered by initial adhesion of bacteria is difficult in high ammonia nitrogen wastewater treatment. In this study, the influence of two commonly used N-acyl homoserine lactones (AHLs), N-Hexanoyl-L-homoserine lactone (C6-HSL) and N-Octanoyl-L-homoserine lactone (C8-HSL), on the adhesion of soluble macromolecules and bacteria in four types of high ammonia nitrogen wastewater to surfaces of model biocarriers (i.e. polystyrene, polyamide and polyethylene terephthalate) was investigated by using a quartz crystal microbalance with dissipation (QCM-D) monitoring technology. Results showed that the adhesion was enhanced by the addition of exogenous AHLs and there was more microbial retention attributed by C8-HSL. Greater deposition amount was generally found on PS and better enhanced performances of the adhesion were found on PA surface. Furthermore, viscoelastic film formed under synchronous high-low salinity and organic content and dominant bacteria of real wastewater determined the role of exogenous AHLs. The method of adding moderate amount of exogenous AHLs into bioreactors has important implications for accelerating the startup process treating high ammonia nitrogen wastewater by biofilm process. (C) 2017 Elsevier B.V. All rights reserved.
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