Insights into the effects of carbon source on sequencing batch reactors: Performance, quorum sensing and microbial community

Li, Songya; Fei, Xuening; Cao, Lingyun; Chi, Yongzhi

doi:10.1016/j.scitotenv.2019.07.191

Cited by 42 publications

(13 citation statements)

References 50 publications

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“…Glucose was used as the carbon source, providing a COD concentration of 300 mg/L. Otherwise, the synthetic wastewater composition was as follows: glucose (0.2813 g), KH 2 PO 4 (0.0219 g), (NH 4 ) 2 SO 4 (0.1414 g), NaHCO 3 (0.5000 g), CaCl 2 (0.0300 g), MgSO 4 •7H 2 O (0.200 g), which was the same as that mentioned by Li et al (2019). A total of 20 L of synthetic wastewater was persistently pumped into each A/O reactor each day, resulting in an HRT of approximately 12 h. The SRT was maintained at approximately 20 days by ensuring daily sludge discharge.…”

Section: Operation Of A/o Reactormentioning

confidence: 79%

“…The polysaccharide (PS) and protein (PN) content of EPS were determined by the anthrone method and Modified Lowry Protein Assay Kit (Sangon, China), respectively. The detailed procedure of excitation-emission matrix (EEM) and parallel factor (PARAFAC) analysis were as similarly reported by Li et al (2019).…”

Section: Extraction and Analysis Of Epsmentioning

confidence: 99%

“…Numerous studies have shown that cell-cell communication is a phenomenon of quorum sensing (QS), which is mediated by producing signaling molecules (Ding et al 2015;Maddela et al 2019). QS is widely observed in various microorganisms and mediates a variety of physiological behaviors, such as nutrient removal and extracellular polymeric substances (EPS) production (Ma et al 2018;Li et al 2019). Therefore, it has gained even more attention with respect to wastewater treatment (Tan et al 2014;Zhao et al 2018;Maddela et al 2019;Sun et al 2019;Wang et al 2019).…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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Impact of light on anoxic/oxic reactors: performance, quorum sensing, and metagenomic characteristics

Fei

Wang

et al. 2021

Water Science and Technology

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The effect of light has raised attention on wastewater treatment. However, little research has concentrated on the influences of light on activated sludge. In this study, the influences of light on the performance, quorum sensing (QS) and metagenomic characteristics of anoxic/oxic reactors were investigated. The reactor without light (AO1) showed higher total nitrogen (TN) removal (79.15 ± 1.69%) than the reactor with light (AO2) (74.54 ± 1.30%), and significant differences were observed. It was observed that light facilitated the production of protein-like and tryptophan-like substances by employing parallel factor analysis for extracellular polymeric substance (EPS), resulting in more EPS production in AO2, indicating light was beneficial to EPS production. The concentrations of N-acyl-homoserine lactones (AHLs) were various in the two reactors, so the AHLs-mediated QS behaviors in both reactors were also different. These results revealed that light significantly influenced nitrogen removal, EPS, and QS. Metagenomic analysis based on Tax4Fun demonstrated that light reduced the denitrification, stimulated the polysaccharide and protein biosynthesis pathways and down-regulated the AHLs synthesis pathway, resulting in lower TN removal, more EPS production, and lower AHLs concentrations. Based on the above, the likely mechanism was proposed for the influences of light on the reactor.

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Section: Operation Of A/o Reactormentioning

confidence: 79%

Section: Extraction and Analysis Of Epsmentioning

confidence: 99%

Section: Graphical Abstract Introductionmentioning

confidence: 99%

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Impact of light on anoxic/oxic reactors: performance, quorum sensing, and metagenomic characteristics

Fei

Wang

et al. 2021

Water Science and Technology

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“…Furthermore, Cand. Nitrotoga was one of the most prominent bacterial taxa (up to 6.8% of total bacteria) in anoxic/oxic reactor systems fed with acetate or glucose (Xing et al 2018 ; Li et al 2019 ). However, a possible denitrifying potential and mixotrophic or heterotrophic growth of Cand.…”

Section: Lessons Learned From Cand Nitrotoga Culturesmentioning

confidence: 99%

Relevance of Candidatus Nitrotoga for nitrite oxidation in technical nitrogen removal systems

Spieck

Wegen

Keuter

2021

Appl Microbiol Biotechnol

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Many biotechnological applications deal with nitrification, one of the main steps of the global nitrogen cycle. The biological oxidation of ammonia to nitrite and further to nitrate is critical to avoid environmental damage and its functioning has to be retained even under adverse conditions. Bacteria performing the second reaction, oxidation of nitrite to nitrate, are fastidious microorganisms that are highly sensitive against disturbances. One important finding with relevance for nitrogen removal systems was the discovery of the mainly cold-adapted Cand. Nitrotoga, whose activity seems to be essential for the recovery of nitrite oxidation in wastewater treatment plants at low temperatures, e.g., during cold seasons. Several new strains of this genus have been recently described and ecophysiologically characterized including genome analyses. With increasing diversity, also mesophilic Cand. Nitrotoga representatives have been detected in activated sludge. This review summarizes the natural distribution and driving forces defining niche separation in artificial nitrification systems. Further critical aspects for the competition with Nitrospira and Nitrobacter are discussed. Knowledge about the physiological capacities and limits of Cand. Nitrotoga can help to define physico-chemical parameters for example in reactor systems that need to be run at low temperatures. Key points • Characterization of the psychrotolerant nitrite oxidizer Cand. Nitrotoga • Comparison of the physiological features of Cand. Nitrotoga with those of other NOB • Identification of beneficial environmental/operational parameters for proliferation

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“…To date, a variety of activated sludge processes had been developed for HORW treatment [3]. Among them, the activated sludge sequencing batch reactor (ASSBR) is the most promising one because of its low operational cost, high volumetric loading rate, small space footprint, biological detoxification ability, etc.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Bioaugmentation on the Performance and Microbial Community Dynamics of an Industrial-Scale Activated Sludge Sequencing Batch Reactor under Various Loading Shocks of Heavy Oil Refinery Wastewater

Cui

Sheng

et al. 2021

Water

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The stable and efficient operation of the activated sludge sequencing batch reactor (ASSBR) in heavy oil refineries has become an urgent necessity in wastewater biotreatment. Hence, we constructed a green and efficient solid bioaugmentation agent (SBA) to enhance the resistance of the reactor to loading shock. The impact of bioaugmentation on the performance and microbial community dynamics under three patterns of heavy oil refinery wastewater (HORW) loading shock (higher COD, higher toxicity, and higher flow rate) was investigated on an industrial-scale ASSBR. Results showed that the optimal SBA formulation was a ratio and addition of mixed bacteria Bacillus subtillis and Brucella sp., of 3:1 and 3.0%, respectively, and a glucose concentration of 5.0 mg/L. The shock resistance of ASSBR was gradually enhanced and normal performance was restored within 6–7 days by the addition of 0.2% SBA. Additionally, the removal efficiency of chemical oxygen demand and total nitrogen reached 86% and 55%, respectively. Furthermore, we found that Burkholderiaceae (12.9%) was replaced by Pseudomonadaceae (17.1%) in wastewater, and Lachnospiraceae (25.4%) in activated sludge was replaced by Prevotellaceae (35.3%), indicating that the impact of different shocks effectively accelerated the evolution of microbial communities and formed their own unique dominant bacterial families.

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Insights into the effects of carbon source on sequencing batch reactors: Performance, quorum sensing and microbial community

Cited by 42 publications

References 50 publications

Impact of light on anoxic/oxic reactors: performance, quorum sensing, and metagenomic characteristics

Impact of light on anoxic/oxic reactors: performance, quorum sensing, and metagenomic characteristics

Relevance of Candidatus Nitrotoga for nitrite oxidation in technical nitrogen removal systems

The Impact of Bioaugmentation on the Performance and Microbial Community Dynamics of an Industrial-Scale Activated Sludge Sequencing Batch Reactor under Various Loading Shocks of Heavy Oil Refinery Wastewater

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