Biofilm activity, ammonia removal and cell growth of the heterotrophic nitrifier,<i>Acinetobacter</i>sp., facilitated by exogenous<i>N</i>-acyl-homoserine lactones

Wang, Xiu‐Jie; Wang, Weiqi; Li, Yun; Zhang, Jing; Zhang, Yang

doi:10.1039/c8ra05545a

Cited by 26 publications

(6 citation statements)

References 40 publications

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“…Zhang et al demonstrated that the addition of exogenous AHLs stimulated the sustained release of AHLs in a sequencing batch reactor. It has been shown that C6-HSL can increase the rate of ammonia and nitrate removal, PN concentration, and abundance of amoA , − which was consistent with the fast COD and ammonia nitrogen removal rates observed in the bisynergistic-QS system groups in stage I in the present study. In stage II, C6-HSL, 3OC12-HSL, and 3OC14-HSL in R M3 were 1.78–2.98 folds, 1.21–1.69 folds, and 1.06–1.40 folds of those in R M1 and R M2 at day 34.…”

Section: Resultssupporting

confidence: 90%

Biofilm Reactor Performance and Shifts of Microbial Community during the Start-Up and Operation Phase of MBBRs at 8 °C: Effect of Exogenous Quorum Sensing Bacteria

et al. 2023

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Quorum sensing (QS) plays a critical role in the enhancement of biofilm performance at low temperatures. In this study, a uni-QS (Sphingomonas rubra) and three bisynergistic-QS [composed of S. rubra and one of the isolated QS aerobic denitrifying bacteria (QS-ADB) Pseudomonas mendocina QQQC, P. mendocina ABDF, and Enterobacter aerogenes] were added to biofilm reactors in the start-up phase at 8 °C. Results indicate that compared to the control reactor, bisynergistic-QS exhibited maximum TN removal efficiency (93.50 ± 5.44, 93.97 ± 3.93, and 92.35 ± 5.04%), largest functional genes amoA, narG, and norB abundance (15-fold, 15-fold, and 75-fold), and uprising C10-HSL and C14-HSL concentrations (22.32-to 39.28-fold and 3.87-to 8.66-fold). Network analysis revealed that the biofilm thickness which possessed strong relationships with its dominant bacteria might contribute to great performance in bisynergistic-QS reactors under low temperature and increased loading rate. Proteobacteria play an important role in the AHL-based QS system. The abundance of keystone taxa Raoultella, Micropruina, and Zoogloea deserved more attention utilizing exogenous aerobic denitrifier addition. This study provided a helpful guideline for the design of exogenously enhancing biofilm denitrification systems at low temperatures.

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Section: Resultssupporting

confidence: 90%

Biofilm Reactor Performance and Shifts of Microbial Community during the Start-Up and Operation Phase of MBBRs at 8 °C: Effect of Exogenous Quorum Sensing Bacteria

et al. 2023

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“…Figure 11 shows the cultures in a semi-continuous process with an agitation of 120 rpm to guarantee no limitations in the oxygen supplies. The immobilized bacteria culture showed, at the final stage of the process, an increment of the nitrification performance which is probably due to the biofilm maturity of the bacterial consortium [57,58]. One of the most striking features is the performance of modelization applied on real wastewater in a large period of time.…”

Section: Inhibition Assays: Maximum Load Of Brnwmentioning

confidence: 99%

Nitrification Process in a Nuclear Wastewater with High Load of Nitrogen, Uranium and Organic Matter under ORP Controlled

Venturini

Rossen²,

Paulo

2021

Water

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To produce nuclear fuels, it is necessary to convert uranium′s ore into UO2-ceramic grade, using several quantities of kerosene, methanol, nitric acid, ammonia, and, in low level, tributyl phosphate (TBP). Thus, the effluent generated by nuclear industries is one of the most toxic since it contains high concentrations of dangerous compounds. This paper explores biological parameters on real nuclear wastewater by the Monod model in an ORP controlled predicting the specific ammonia oxidation. Thermodynamic parameters were established using the Nernst equation to monitor Oxiders/Reductors relationship to obtain a correlation of these parameters to controlling and monitoring; that would allow technical operators to have better control of the nitrification process. The real nuclear effluent is formed by a mixture of two different lines of discharges, one composed of a high load of nitrogen, around 11,000 mg/L (N-NH4+-N-NO3−) and 600 mg/L Uranium, a second one, proceeds from uranium purification, containing TBP and COD that have to be removed. Bioprocesses were operated on real wastewater samples over 120 days under controlled ORP, as described by Nernst equations, which proved to be a robust tool to operate nitrification for larger periods with a very high load of nitrogen, uranium, and COD.

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“…Laser scanning confocal microscopy (LSCM) is often used to observe biofilm formation in a QS enhancement system, but rarely giving quantitative results. We collected the LSCM images from some researches and calculated the pixels proportion of fluorescent biofilm with and without QS enhancement (Huang et al, 2016;Hu et al, 2017;Wang et al, 2018;Xiong et al, 2020). The result is shown in Fig.…”

Section: Biofilm Formationmentioning

confidence: 99%

“…However, the positive effect of QS enhancement for other QS signaling molecule content such as PQS and AIPs on EPS production is lack solid evidence. There are some QS signaling molecule such as diffusible signal factor (DSF), 3OC6-HSL, 3-oxo-C10-HSL might have no significant positive or negative effect on EPS production in biological treatment systems (Ding et al, 2015;Lv et al, 2018;Wang et al, 2018;Huang et al, 2019), and the reason why those QS signaling molecule had opposite EPS trends with increasing their content s in bioreactors is still not understood. These molecules should be avoided in similar conditions if the aim is to increase the EPS production.…”

Section: Eps Productionmentioning

confidence: 99%

Quorum sensing regulation methods and their effects on biofilm in biological waste treatment systems: A review

Sun

Yang

et al. 2021

Front. Environ. Sci. Eng.

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Quorum sensing (QS) plays an important role in microbial aggregation control. Recently, the optimization of biological waste treatment systems by QS regulation gained an increasing attention. The effects of QS regulation on treatment performances and biofilm were frequently investigated. To understand the state of art of QS regulation, this review summarizes the methods of QS enhancement and QS inhibition in biological waste treatment systems. Typical QS enhancement methods include adding exogenous QS molecules, adding QS accelerants and cultivating QS bacteria, while typical QS inhibition methods include additions of quorum quenching (QQ) bacteria, QS-degrading enzymes, QS-degrading oxidants, and QS inhibitors. The specific improvements after applying these QS regulation methods in different treatment systems are concluded. In addition, the effects of QS regulation methods on biofilm in biological waste treatment systems are reviewed in terms of biofilm formation, extracellular polymeric substances production, microbial viability, and microbial community. In the end, the knowledge gaps in current researches are analyzed, and the requirements for future study are suggested.

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Biofilm activity, ammonia removal and cell growth of the heterotrophic nitrifier,Acinetobactersp., facilitated by exogenousN-acyl-homoserine lactones

Abstract: In the present study, the heterotrophic nitrification–aerobic denitrification strain, Acinetobacter sp. JQ1004, was treated with three typical N-acyl-homoserine lactone (AHL) molecules (C6-HSL, C8-HSL, and 3-oxo-C10-HSL) during the nitrogen removal process.

Cited by 26 publications

References 40 publications

Biofilm Reactor Performance and Shifts of Microbial Community during the Start-Up and Operation Phase of MBBRs at 8 °C: Effect of Exogenous Quorum Sensing Bacteria

Biofilm Reactor Performance and Shifts of Microbial Community during the Start-Up and Operation Phase of MBBRs at 8 °C: Effect of Exogenous Quorum Sensing Bacteria

Nitrification Process in a Nuclear Wastewater with High Load of Nitrogen, Uranium and Organic Matter under ORP Controlled

Quorum sensing regulation methods and their effects on biofilm in biological waste treatment systems: A review

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