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- Title
Effect of quorum quenching enzyme on the nitrogen removal performance and sludge property of MBR-CANON process.
- Authors
ZHANG Xiaojing; ZHANG Hongli; ZHANG Nan; WEI Denghui; MA Bingbing; ZHANG Han; YANG Haojie
- Abstract
Quorum quench enzyme-Acyl-Homoserine-Lactones (AHLs) acyltransferase was added to the stable MBR-CANON process, the nitrogen removal performance, sludge property, key enzymes' activity and microbial community were tracked and analyzed. The results showed that the addition of AHLs acyltransferase significantly suppressed the nitrogen removal ability. The AHLs acyltransferase in 0.5 mg/L obviously decreased the ammonia removal efficiency from 83.7% to 57.0%, and the total nitrogen removal efficiency from 65.9% to 43.6%. The extracellular polymeric substance in the sludge attaching to the membrane surface was also decreased by the AHLs acyltransferase, which was beneficial to alleviate the membrane fouling. Additionally, the activity of hydroxylamine oxidoreductase, ammonia monooxygenase, and nitrite reductase all significantly decreased with the addition of AHLs acyltransferase. The inhibition of AHLS acyltranferase on the activity of aerobic ammonia-oxidizing bacteria was greater than that on the anaerobic ammonia-oxidizing bacteria (AAOB), but the effect on their relative abundances was opposite. The suppression on AAOB was mainly attributed to the lack of substrate.
- Subjects
ACYL-homoserine lactones; NITRITE reductase; AMMONIA-oxidizing bacteria; ENZYMES; ACYLTRANSFERASES; ANAEROBIC bacteria
- Publication
Journal of Light Industry, 2022, Vol 37, Issue 6, p110
- ISSN
2096-1553
- Publication type
Article
- DOI
10.12187/2022.06.014