title: Cell adhesion, ammonia removal and granulation of autotrophic nitrifying sludge facilitated by N-acyl-homoserine lactones.
abstract: In this study, six N-acyl-homoserine lactone (AHL) molecules (C6-HSL, C8-HSL, C10-HSL, 3-oxo-C6-HSL, 3-oxo-C8-HSL and 3-oxo-C10-HSL) were each dosed into a bioreactor and seeded using autotrophic nitrifying sludge (ANS). The effects of the AHLs on cell adhesion, nitrification and sludge granulation were investigated. The results indicated that the efficiencies of cell adhesion and ammonia removal both had a close correlation with the side chain length and β position substituent group of the AHLs. The best-performing AHL in terms of accelerating bacterial attached-growth was 3-oxo-C6-HSL, whereas C6-HSL outperformed the others in terms of the ammonia degradation rate. The addition of 3-oxo-C6-HSL or C6-HSL increased the biomass growth rate, microbial activity, extracellular proteins and nitrifying bacteria, which can accelerate the formation of nitrifying granules. Consequently, selecting AHL molecules that could improve bacteria in attached-growth mode and nitrification efficiency simultaneously will most likely facilitate the rapid granulation of nitrifying sludge.
authors: Key Laboratory of Water and Sediment Sciences of Ministry of Education/State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China. Electronic address: liaj@bnu.edu.cn.
authors: An-Jie
authors: AJ
authors: Li
authors: Key Laboratory of Water and Sediment Sciences of Ministry of Education/State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
authors: Bao-Lian
authors: BL
authors: Hou
authors: Key Laboratory of Water and Sediment Sciences of Ministry of Education/State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, PR China.
authors: Mei-Xi
authors: MX
authors: Li
mesh_terms: D054742:Acyl-Butyrolactones / Q000737:chemistry / Q000378:metabolism; D000641:Ammonia / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D001419:Bacteria / Q000166:cytology / Q000378:metabolism; D019149:Bioreactors / Q000382:microbiology*; D002448:Cell Adhesion; D058465:Nitrification; D012722:Sewage / Q000737:chemistry*
chemical_list: D054742:Acyl-Butyrolactones; D012722:Sewage; D000641:Ammonia
keywords: Ammonia-rich inorganic wastewater; Autotrophic nitrification; Cell adhesion; N-Acyl-homoserine lactone (AHL); Sludge granulation