JOURNAL OF LIGHT INDUSTRY

CN 41-1437/TS  ISSN 2096-1553

Volume 37 Issue 6
December 2022
Article Contents
ZHANG Xiaojing, ZHANG Hongli, ZHANG Nan, et al. Effect of quorum quenching enzyme on the nitrogen removal performance and sludge property of MBR-CANON process[J]. Journal of Light Industry, 2022, 37(6): 110-118. doi: 10.12187/2022.06.014
Citation: ZHANG Xiaojing, ZHANG Hongli, ZHANG Nan, et al. Effect of quorum quenching enzyme on the nitrogen removal performance and sludge property of MBR-CANON process[J]. Journal of Light Industry, 2022, 37(6): 110-118. doi: 10.12187/2022.06.014 shu

Effect of quorum quenching enzyme on the nitrogen removal performance and sludge property of MBR-CANON process

  • Received Date: 2021-08-13
    Accepted Date: 2022-05-06
  • 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.
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