Enhanced transformation and dechlorination of p-chloronitrobenzene in the combined ZVI–anaerobic sludge system

Zhu, Liang; Lin, Haizhuan; Qi, Jiaoqin; Xu, Xiangyang

doi:10.1007/s11356-013-1631-z

Cited by 16 publications

(8 citation statements)

References 33 publications

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“…Colunga et al (2015) reported high inhibitory effects and poor reduction of 3-CNB at concentration of 0.5 mM under methanogenic conditions, suggesting to apply an adequate loading rate of this type of contaminant in UASB reactors to avoid inhibition of the microbial consortia. Other studies concerning p-CNB have been reported in anaerobic conditions using zero valent iron (dosage of 1 g L −1 , for p-CNB of 0.28 mM) (Zhu et al 2013) and a novel bioelectrode-UASB coupled system (99 % removal of p- Fig. 4 Proposed pathway of iopromide degradation and transformation products CNB with transformation rate of 0.328 h −1 for concentration 0.19 mM) (Zhu et al 2014).…”

Section: Discussionmentioning

confidence: 99%

Immobilization of biogenic Pd(0) in anaerobic granular sludge for the biotransformation of recalcitrant halogenated pollutants in UASB reactors

Pat-Espadas

Razo-Flores

Rangel-Mendez

et al. 2015

Appl Microbiol Biotechnol

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The capacity of anaerobic granular sludge to reduce Pd(II), using ethanol as electron donor, in an upflow anaerobic sludge blanket (UASB) reactor was demonstrated. Results confirmed complete reduction of Pd(II) and immobilization as Pd(0) in the granular sludge. The Pd-enriched sludge was further evaluated regarding biotransformation of two recalcitrant halogenated pollutants: 3-chloro-nitrobenzene (3-CNB) and iopromide (IOP) in batch and continuous operation in UASB reactors. The superior removal capacity of the Pd-enriched biomass when compared with the control (not exposed to Pd) was demonstrated in both cases. Results revealed 80 % of IOP removal efficiency after 100 h of incubation in batch experiments performed with Pd-enriched biomass whereas only 28 % of removal efficiency was achieved in incubations with biomass lacking Pd. The UASB reactor operated with the Pd-enriched biomass achieved 81 ± 9.5 % removal efficiency of IOP and only 61 ± 8.3 % occurred in the control reactor lacking Pd. Regarding 3-CNB, it was demonstrated that biogenic Pd(0) promoted both nitro-reduction and dehalogenation resulting in the complete conversion of 3-CNB to aniline while in the control experiment only nitro-reduction was documented. The complete biotransformation pathway of both contaminants was proposed by high-performance liquid chromatography-mass spectrometry (HPLC-MS) analysis evidencing a higher degree of nitro-reduction and dehalogenation of both contaminants in the experiments with Pd-enriched anaerobic sludge as compared with the control. A biotechnological process is proposed to recover Pd(II) from industrial streams and to immobilize it in anaerobic granular sludge. The Pd-enriched biomass is also proposed as a biocatalyst to achieve the biotransformation of recalcitrant compounds in UASB reactors.

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Section: Discussionmentioning

confidence: 99%

Immobilization of biogenic Pd(0) in anaerobic granular sludge for the biotransformation of recalcitrant halogenated pollutants in UASB reactors

Pat-Espadas

Razo-Flores

Rangel-Mendez

et al. 2015

Appl Microbiol Biotechnol

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“…However, they did not report dehalogenation efficiency. Removals of p-chloronitrobenzene in bioreactors seeded with anaerobic sludge in combination with ZVI were higher than those of control bioreactors with only anaerobic sludge (increase of 47 %, compared to sludge control; Zhu et al 2013). The experiments were performed in batch small reactors (serum bottles, 100 mL), inoculated with anaerobic sludge (1.5 g of volatile suspended solids (VSS)/L, previously acclimated to the pollutant) from a municipal wastewater plant and loaded with 5 g/L ZVI 22 mm average diameter.…”

Section: Introductionmentioning

confidence: 81%

Transient Performance of Two-Electron Regime Bioreactors That Contained Unacclimated Biocatalysts After Feeding Perchloroethylene

Moreno-Medina

Poggi‐Varaldo

Bretón-Deval

et al. 2017

Rev. Int. Contam. Ambie.

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The objective of this work was to assess the impact of perchloroethylene (PCE) and coupled zero valent iron (ZVI) filters on the transient performance of fluidized bed bioreactors (FBBRs) operated in simultaneous electron acceptors modes. Four lab scale, FBBRs were implemented. Two FBBRs were operated as simultaneous methanogenicdenitrifying (MD) units, whereas the other two were operated in partially-aerated methanogenic (PAM) mode. In the first period all FBBRs received a synthetic wastewater with 1 g COD-methanol/L. In a second period, all the FBBRs received the synthetic wastewater plus 80 mg PCE/L. At the start of period 2, one MD and one PAM FBBRs were coupled to side sand-ZVI filters. All bioreactors anchored microbial consortia unacclimated to PCE. In this work, bioreactor performance in the full period 1 and the first 15 days of period 2 (transient state) is reported and discussed. The chemical oxygen demand and the nitrate removal efficiency of the FBBRs did not decrease between period 1 and period 2, i.e., upon PCE addition, particularly for MD bioreactors. On the contrary, specific oxygen uptake rate of all FBBRs in period 2 decreased by ca. 80 to 96 % or more compared to period 1. In period 2, PCE removals and dehalogenation efficiency were in the range of 81 to 94 % and 73 to 90 %, respectively. The highest values corresponded to PAM bioreactors, particularly for that equipped with ZVI filter. Slight positive effects of ZVI filter on PCE removal and the dehalogenation efficiencies were observed in the PAM ZVI bioreactor configuration. It is concluded that the simultaneous electron acceptor type (PAM vs. MD) had a significant effect on the bioreactor performance, whereas the coupling to ZVI filters only had a slight positive effect on the bioreactor performance in the PAM-ZVI bioreactor.Palabras clave: lecho fluidizado, metanogénico con aereación parcial simultáneo, metanogénico-desnitrificante simultáneo, hierro metálico 84 RESUMENEl objetivo del presente trabajo fue evaluar el impacto del filtro acoplado de hierro cero-valente sobre el desempeño de biorreactores de lecho fluidizado (BLEF) operados con aceptores simultáneos de electrones y sometidos a altas concentraciones de percloroetileno (PCE). Se utilizaron cuatro BLEF a escala laboratorio, dos operados en metanogénesis con aireación parcial (MAP) y dos metanogénicos-desnitrificantes (MD). En el primer periodo todos los BLEF se alimentaron con agua residual sintética y 1 g de COD-metanol/L. En el segundo periodo todos los BLEF recibieron la misma agua residual sintética más 80 mg PCE/L. A un BLEF MAP y un BLEF MD se les acopló un filtro de arena-partículas de hierro metálico. A partir de ese momento se operó lo que denominamos estado transitorio de los primeros 15 días. Todos los biorreactores fueron inoculados originalmente con un consorcio no aclimatado a PCE. En este trabajo se reporta el periodo 1 completo y el efecto inicial (15 días) del PCE y los filtros de arena-hierro metálico acoplados a los biorreactores (periodo 2). La eli...

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“…Chloroanilines are widely used for the industrial synthesis of pesticides, plastics and dyes 1,2 . Thus, chloroanilines may be released into the environment directly during transportation and industrial processing or indirectly from the anaerobic biotransformation of many pesticides and dyes 2,3 . It is well known that the dechlorination and subsequent degradation of chloroanilines are slow processes under anaerobic conditions 2,4 .…”

Section: Introductionmentioning

confidence: 99%

Enhanced dechlorination and biodegradation of 2-chloroaniline by a 2-aminoanthraquinone-graphene oxide composite under anaerobic conditions

Lü

Zhang

Zhou

et al. 2019

Sci Rep

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The effect of a 2-aminoanthraquinone-graphene oxide (AQ-GO) composite on the anaerobic dechlorination and degradation of chloroanilines by an enriched bacterial consortium was investigated. The results showed that the maximal degradation efficiency of 20 mg/L 2-chloroaniline (2-CA) reached 91.4% at a dose of 20 mg/L AQ-GO in 30 d. Moreover, the pseudo-first-order rate constant of 2-CA degradation in the AQ-GO-mediated system was 2.9-fold higher than those in AQ- and GO-mediated systems alone. During this process, a synergetic effect between AQ and GO was observed, which was attributed to the increased intracellular and extracellular electron transfer pathways. GC-MS analysis showed that 2-CA could be degraded to hexanoic acid and ultimately mineralized to CO 2 . Illumina MiSeq sequencing revealed that additional AQ-GO significantly increased the relative abundance of Firmicutes . Further analysis showed that the populations of the genera Oscillospira , unclassified Lactobacillales , unclassified Veillonellaceae and Ruminococcus exhibited positive correlations with the rate constant of 2-CA degradation and the dehydrogenase activity of bacterial consortium. These findings indicated that AQ-GO promoted the enrichment of functional bacteria and increased the bacterial activity, resulting in the enhanced dechlorination and degradation of 2-chloroaniline.

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Enhanced transformation and dechlorination of p-chloronitrobenzene in the combined ZVI–anaerobic sludge system

Cited by 16 publications

References 33 publications

Immobilization of biogenic Pd(0) in anaerobic granular sludge for the biotransformation of recalcitrant halogenated pollutants in UASB reactors

Immobilization of biogenic Pd(0) in anaerobic granular sludge for the biotransformation of recalcitrant halogenated pollutants in UASB reactors

Transient Performance of Two-Electron Regime Bioreactors That Contained Unacclimated Biocatalysts After Feeding Perchloroethylene

Enhanced dechlorination and biodegradation of 2-chloroaniline by a 2-aminoanthraquinone-graphene oxide composite under anaerobic conditions

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