Synergy of N-(3-oxohexanoyl)-l-homoserine lactone and tryptophan-like outer extracellular substances in granular sludge dominated by aerobic ammonia-oxidizing bacteria
Autor: | An-jie Li, Xiao-Man Jiang, Li-Li Wang, Bao-lian Hou, Ling-juan Wu |
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Rok vydání: | 2018 |
Předmět: |
0208 environmental biotechnology
02 engineering and technology 010501 environmental sciences Waste Disposal Fluid 01 natural sciences Applied Microbiology and Biotechnology Ammonia chemistry.chemical_compound Granulation Extracellular polymeric substance 4-Butyrolactone Biomass Nitrite 0105 earth and related environmental sciences Sewage biology Chemistry Tryptophan General Medicine biology.organism_classification Extracellular Matrix 020801 environmental engineering Activated sludge Chemical engineering Aerobic granulation Sewage treatment Bacteria Biotechnology |
Zdroj: | Applied Microbiology and Biotechnology. 102:10779-10789 |
ISSN: | 1432-0614 0175-7598 |
DOI: | 10.1007/s00253-018-9437-z |
Popis: | Nitrogen removal via nitrite is an energy-saving method for high-strength ammonia wastewater treatment. A better understanding of the formation of granular sludge dominated by aerobic ammonia-oxidizing bacteria (AerAOB) could facilitate the improved use of rapid sludge granulation for nitritation. In this study, AerAOB-dominated activated sludge (NAS) and granular sludge (NGS) produced different N-scyl-homoserine lactones (AHLs). N-(3-oxohexanoyl)-L-homoserinelactone (OHHL), only released from NGS, was shown to accelerate sludge aggregation by increasing the biomass growth rate, microbial activity, extracellular protein, and AerAOB biomass. For both NAS and NGS, sludge cells were glued together by inner extracellular polymeric substances (EPSs) with similar components to form microcolony. Different from the characterized negative effect of NAS's outer-EPS on cell adhesion, the outer-EPS of NGS played a positive role in the attached growth of AerAOB-dominated sludge and contained more tryptophan-like substances. More interesting, OHHL enhanced the yields of tryptophan-like substances after mixing with the outer-EPS of NGS, enhancing cell adhesion. In a word, OHHL and more tryptophan-like substances were produced in the process of granulation under the selective sludge discharge condition, which was proved to be able to accelerate NAS granulation. Therefore, the sludge granulation process for nitritation can be improved by increasing the levels of OHHL and tryptophan in the initial startup stage. The appropriate engineering strategy should be further studied to facilitate the actual application of granular sludge for nitrogen removal on a large scale. |
Databáze: | OpenAIRE |
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