期刊
BIORESOURCE TECHNOLOGY
卷 350, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.126944
关键词
extracellular polymeric substances (EPS); Bulking; Polyhydroxyalkanoate; Azithromycin; Quorum sensing
资金
- National Natural Science Foundation of China [52170130]
- Heilongjiang Pro-vincial Key laboratory of Polar Environment and Ecosystem (HPKL-PEE) [2021006]
- National & Local Joint Engineering Research Center for Biomass Energy Development and Utilization (Harbin Institute of Technology) [2021B002]
The addition of azithromycin can improve the sedimentation capacity of the sludge in the polyhydroxyalkanoate (PHA) enrichment stage and prevent extracellular polymeric substances (EPS) sludge bulking. Azithromycin works by reducing the polysaccharide/protein ratio in EPS and inhibiting the growth of bacteria that cause sludge bulking.
The long-term stable operation of the mixed culture polyhydroxyalkanoate (PHA) enrichment stage is the guarantee for the continuous synthesis of PHA, however extracellular polymeric substances (EPS) sludge bulking occurred from time to time may cause the operation fail. In order to solve this problem, as a quencher of signal molecules and antibiotic, azithromycin (AZM) was used in the two systems with different modes to recover the sedimentation capacity of the sludge. The results showed that AZM addition resulted in the reduction of poly-saccharide /protein (PS/PN) ratio in EPS and significant improvement of the sedimentation capacity of the sludge. Quorum quenching of AZM or aiiA gene maintained the sedimentation ability of the sludge in a relay mode. By adding AZM, the growth of Thauera and Flavobacterium, which caused sludge bulking, was inhibited. Paracoccus, a strong PHA producer, has been enriched to ensure that the maximum PHA synthesis of the system.
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