2-Chlorophenol consumption by cometabolism in nitrifying SBR reactors

Martínez-Jardines, Miguel; Martínez-Hernández, Sergio; Texier, Anne‐Claire; Cuervo-López, Flor de María

doi:10.1016/j.chemosphere.2018.08.064

Cited by 23 publications

(11 citation statements)

References 41 publications

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“…According to the results obtained in the present work, it seems that the high evenness, the microbial diversity attained along the operation cycles in the SBR systems, and the metabolic improvement of the participating species were determinants for achieving a metabolically stable and kinetically adapted nitrifying process able to simultaneously consume high 2‐CP and ammonium concentrations. Moreover, the total consumption of the different 2‐CP concentrations amended to the reactors could be associated with heterotrophic bacteria aside from the nitrifying bacteria present within the consortia, as it has been reported that the AMO enzyme has the capacity to cometabolically oxidize 2‐CP 23 …”

Section: Resultsmentioning

confidence: 99%

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Population dynamics of nitrifying sludge supplemented with 2‐chlorophenol in SBR reactors

Martínez-Jardines

González-Robles

González‐Márquez

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND The metabolic improvement and reduction of the inhibitory effect of 2‐chlorophenol (2‐CP) on the nitrification process occurring in nitrifying SBR systems can be associated with changes in the microbial community. The physiologic, kinetic, and microbial population behaviors of two nitrifying sludges were evaluated in two parallel sequencing batch reactors (SBR1 and SBR2) amended with 2‐CP. Seven cycles were performed with 20 to 60 mg 2‐CP‐C/L. RESULTS Ammonium‐oxidizing and nitrite‐oxidizing processes were physiologically disturbed in SBR1 and SBR2 due to increased 2‐CP concentrations, attaining ammonium consumption efficiencies (ENH4+‐N) and nitrate yields (YNO3−‐N) as low as 38% and 0.32 mg NO3−‐N/mg NH4+‐N consumed, respectively. Nevertheless, in cycle 7, both sludges recovered their physiological capacities, as ENH4+‐N of 100% and YNO3−‐N > 0.94 mg NO3−‐N/mg NH4+‐N consumed were achieved in both nitrifying processes. Increase in 2‐CP concentration also affected the kinetics of nitrification processes, wherein a higher inhibition on the specific rate of ammonium‐oxidizing process was observed. Despite the increase in 2‐CP concentration, no predominance of species was noted, as the bacterial community evenness index remained above 0.97, whereas the richness index increased along with SBR operation. CONCLUSION The stable, complete, and efficient nitrifying process achieved in both SBRs could be related to the higher bacterial community richness and to the regular maintenance of ammonium and nitrite oxidizing bacteria tolerant to 2‐CP along experimentation. Total 2‐CP consumption might be associated with ammonium‐oxidizing and/or heterotrophic bacteria related to Nitrosospira, Luteimonas, and Cohnella. © 2021 Society of Chemical Industry (SCI).

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Section: Resultsmentioning

confidence: 99%

“…Nitrite and nitrate were assessed by capillary electrophoresis (Beckman Coulter, USA), according to Martínez‐Jardines et al . 23 . Microbial protein concentration was determined by modified Lowry's method 24,25 .…”

Section: Methodsmentioning

confidence: 99%

Population dynamics of nitrifying sludge supplemented with 2‐chlorophenol in SBR reactors

Martínez-Jardines

González-Robles

González‐Márquez

et al. 2021

J of Chemical Tech & Biotech

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“…Therefore, not only the genus Pseudomonas , but also the other dominant genera probably had the coincident trends for the expression level of functional genes under 4‐CP stress. The stimulated genes ATPase and hdlh encoding ATPase and HDLH played an important function in providing the energy and achieving the 4‐CP hydrolysis and the stimulated gene amoA encoding AM participated in the 4‐CP biodegradation (Martínez‐Jardines et al ., 2018). Our previous study had found that in the process of 4‐CP wastewater treatment, some toxic intermediate products and secondary metabolites were formed and the sludge acute toxicity was significantly higher than the sludge without 4‐CP treatment (Zhao et al ., 2016).…”

Section: Resultsmentioning

confidence: 99%

“…To protect the microbes from damage and maintain the normal function of proteins under heavy metals and toxic organic pollutants shock, the protective enzyme systems including superoxide dismutase (SOD), catalase (CAT), peroxidase (POD) and reduced glutathione (GSH) are formed (Zeng et al ., 2012). Ammonium monooxygenase (AM) has an ability to take part in the consumption of 2‐chlorophenol (2‐CP) in nitrifying sludge (Martínez‐Jardines et al ., 2018). Cytochromes play an essential role in transferring electrons, metabolizing xenobiotic compounds and detoxifying in the process of toxic pollutants degradation (Wu et al ., 2011; Zhou et al ., 2017).…”

Section: Introductionmentioning

confidence: 99%

Temporal responses of 4‐chlorophenol on the performance and functional genes expression of activated sludge in sequencing batch bioreactor

Zhao

et al. 2020

Water & Environment J

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In this study, a lab-scale sequencing batch bioreactor (SBR) with hydraulic retention time (HRT) of 8 h was established to treat 50 mg/L 4-chlorophenol (4-CP), and the temporal responses of 4-CP on the performance and the expression level of related functional genes in sludge were explored. Results showed that after the SBR was acclimated with the cometabolic carbon sources of 4-CP and methanol, the pollutants were effectively degraded. The pollutants removal was influenced by the polysaccharides and proteins in sludge. The real-time PCR showed that except for the gene p450, the prompt removal of pollutants before 2 h caused the significant upregulation of the other functional genes from the genus Pseudomonas in sludge, while the downregulation occurred from 2 to 8 h with the progressive removal of pollutants in SBR cycle, indicating that the removal of pollutants was closely related to the functional genes expression.

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“…Latest reports on treatment of 2-CP include using biological methods [14][15][16], adsorption [17][18][19], photocatalytic degradation [20,21] and advanced oxidation processes [22]. Among all technologies, adsorption has a number of key advantages including easy to handle, high removal efficiency for pollutants at low concentration, no generation of toxic intermediates or secondary products and its comparatively low cost to other treatment processes [23,24].…”

Section: Introductionmentioning

confidence: 99%

Can metal organic frameworks outperform adsorptive removal of harmful phenolic compound 2-chlorophenol by activated carbon?

Azmi

Ladewig

2020

Chemical Engineering Research and Design

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Removal of persistent organic compounds from aqueous solutions is generally achieved using adsorbent like activated carbon (AC) but it suffers from limited adsorption capacity due to low surface area. This paper describes a pioneering work on the adsorption of an organic pollutant, 2-chlorophenol (2-CP) by two MOFs with high surface area and water stability; MIL-101 and its amino-derivative, MIL-101-NH 2 .Although MOFs have higher surface area than AC, the latter was proven better having the highest equilibrium 2-CP uptake (345 mg.g -1), followed by MIL-101 (121 mg.g -1 ) and MIL-101-NH 2 (84 mg.g -1 ). Used MIL-101 could be easily regenerated multiple times by washing with ethanol and even showed improved adsorption capacity after each washing cycle. These results can open the doors to meticulous adsorbent selection for treating 2-CP-contaminated water File list (2) download file view on ChemRxiv manuscript.pdf (472.28 KiB) download file view on ChemRxiv SI.pdf (1.85 MiB) Article Can metal organic frameworks outperform adsorptive removal of harmful phenolic compound 2-chlorophenol by activated carbon?

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2-Chlorophenol consumption by cometabolism in nitrifying SBR reactors

Cited by 23 publications

References 41 publications

Population dynamics of nitrifying sludge supplemented with 2‐chlorophenol in SBR reactors

Population dynamics of nitrifying sludge supplemented with 2‐chlorophenol in SBR reactors

Temporal responses of 4‐chlorophenol on the performance and functional genes expression of activated sludge in sequencing batch bioreactor

Can metal organic frameworks outperform adsorptive removal of harmful phenolic compound 2-chlorophenol by activated carbon?

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