Quorum sensing improved the low-temperature performance of biofilters treating gaseous toluene

Sun, Zhuqiu; Yang, Bairen; Yeung, Marvin; Xi, Jinying

doi:10.1016/j.jhazmat.2022.129277

Cited by 13 publications

(9 citation statements)

References 35 publications

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“…11,12 Moreover, the inactive microbial metabolism and slow biofilm formation in waste gas biofilters lead to a decreased removal capacity at low temperatures. 13 Such a phenomenon was also observed in nitrogen removal moving bed biofilm reactors. 14 These previous studies provided a direct understanding of the effect of low temperature on biofilm formation and community characteristics in differing bioreactor experimental systems.…”

Section: Introductionmentioning

confidence: 68%

“…39 The common approach to guarantee biofilm formation is to maintain an adaptive environment (such as the temperature regulator). 13 However, excessive energy consumption creates a huge problem for engineering. Afterward, the discovery of bacterial communication led to the realization that biofilm formation could be enhanced through community regulation at low temperatures, which was applied in the anammox system and biofilters.…”

Section: Discussionmentioning

confidence: 99%

“…Compared with the addition of expensive signal molecules to promote biofilm formation at low temperatures, the use of spermidine greatly reduces the cost. 13 Even 0.5 mM spermidine can also promote biofilm formation significantly at low temperatures; an exploration of the optimal dosing concentration in the future can further save costs. Meanwhile, it is also worth noting that as an amines compound, spermidine causes a slight increase in the pH of the activated sludge, which may lead to negative impacts on the microbial community.…”

Section: Discussionmentioning

confidence: 99%

“…19 Biomass accumulation in gas biofilters and the activity of anammox biofilm have been significantly improved through the exogenous addition of Nacyl-homoserine lactones (AHLs). 13,20 However, the high cost of signal molecules has become the main factor restricting their large-scale application. There is an urgent need to find a lowcost alternative to improve the feasibility of applications.…”

Section: Introductionmentioning

confidence: 99%

“…To date, several attempts have been made to mitigate the impact of low temperature on biofilm formation, including the installation of temperature controllers, construction of cometabolism systems, and regulation of microbial communities. 13,15 Among these approaches, microbial community regulation has drawn great attention because it could achieve engineering objectives through the regulation of biofilm characteristics. 16−18 For instance, the exogenous addition of signal molecules based on the quorum sensing (QS) principle has been proven to promote the formation and activity of biofilms at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Improving Biofilm Formation and Bioreactor Startup at Low Temperature through Regulating Microbial Community Communication and Stability

Wang,

Lv,

Lin

et al. 2024

ACS EST Water

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Biofilms are widespread in natural and engineering environments and are being increasingly used for pollutant treatment. However, low temperature is one of the major challenges in practice. Here, we developed an alternative strategy to enhance biofilm formation and biofilter startup at 15 °C by supplementing with spermidine, an essential substance for cell growth. A significantly increased biofilm biomass was observed in the treatment group (with spermidine), accompanied by a higher live cell ratio and biofilm matrix excretion as compared with the control (without spermidine). The bacterial communication ability, including quorum sensing and the second messenger system, was found to be enhanced in the treatment group. The bacterial secretion system and quorum sensing pathway were also significantly enriched in differential genes, and most of these genes were upregulated in the treatment group. Robustness and null model analysis revealed that spermidine bolstered microbial community stability and mitigated the dispersal limitation process, which would be conducive to biofilm development. The application of spermidine in biofilters enhanced the biomass accumulation rate and performance. Overall, our results highlighted the importance of the microbial community on biofilm formation regulation and provided a feasible strategy for the enhancement of biofilm formation in low-temperature environments.

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