Cometabolic degradation of TCE in enriched nitrifying batch systems

Kocamemi, Bilge Alpaslan; Çeçen, Ferhan

doi:10.1016/j.jhazmat.2005.06.002

Cited by 33 publications

(15 citation statements)

References 13 publications

(11 reference statements)

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“…Such evidence is in agreement with the results of the study of Kocamemi and Çeçen (2005) who found 88 % SOUR reduction (6.5 to 0.75 mmol O 2 /g VSS·h) when a consortium enriched with nitrifying microorganisms was exposed to 50 mg TCE/L.…”

Section: Effect Of Pce In the Feed-water To Bioreactors On Performancsupporting

confidence: 92%

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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Section: Effect Of Pce In the Feed-water To Bioreactors On Performancsupporting

confidence: 92%

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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“…In comparison, Yang et al (1999) showed TCE cometabolism by a nitrifying culture enriched from a sewage treatment plant at initial [TCE] were between 125 and 200 lg l -1 , while higher initial TCE levels ([200 lg l -1 ) induced inhibition of ammonium oxidation. Kocamemi and Cecen (2005) provided evidence for ammonia oxidation at a high initial [TCE] (4500 lg l -1 ), and showed 68% ammonia removal in comparison to controls. The differences between the results of the present investigation and those of Yang et al (1999) and Kocamemi and Cecen (2005) may be attributed to differences in nitrifying strains.…”

Section: Tce Degradation Potential By Root-associated Methane and Ammmentioning

confidence: 95%

“…Kocamemi and Cecen (2005) provided evidence for ammonia oxidation at a high initial [TCE] (4500 lg l -1 ), and showed 68% ammonia removal in comparison to controls. The differences between the results of the present investigation and those of Yang et al (1999) and Kocamemi and Cecen (2005) may be attributed to differences in nitrifying strains. ], [DO], and [NO x ] in the control (white squares) and the live (black diamonds) microcosms for the two TCE cycles of the ammonia experiment (mean ± 1 SD, n = 3 per treatment).…”

Section: Tce Degradation Potential By Root-associated Methane and Ammmentioning

confidence: 95%

“…Several investigations have shown oxidative cometabolic TCE degradation using mixed nitrifying cultures (Kocamemi and Cecen 2005;Yang et al 1999). In the present study, approximately 15% of initial [TCE] (150 lg l -1 ) degraded in 2 days in live microcosms compared to the killed controls before complete inhibition of the system.…”

Section: Tce Degradation Potential By Root-associated Methane and Ammmentioning

confidence: 99%

“…and [DO] loss, and [NO x ] production were not significantly different between treatments or with cycles (one-way RM ANOVAs, treatment effect, cycle effect, P [ 0.05, Table 1). The inhibitory effect of TCE on ammonia oxidation has been attributed to two potential mechanisms: (a) AMO affinity for TCE may be equivalent or greater in comparison to its affinity for ammonia, and (b) exposure of ammonia oxidizers to TCE (Kocamemi and Cecen 2005) or TCE epoxide (a cometabolism byproduct) (Rasche et al 1991) may cause substantial cellular injury and AMO inhibition. The specific mechanism of AMO inhibition in the present study is unclear, yet there was evidence of toxicity in the precipitous decrease in ammonia oxidation rate that immediately followed TCE addition (compare d [NH 4 ?…”

Section: Tce Degradation Potential By Root-associated Methane and Ammmentioning

confidence: 99%

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Aerobic cometabolic degradation of trichloroethene by methane and ammonia oxidizing microorganisms naturally associated with Carex comosa roots

2010

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The degradation potential of trichloroethene by the aerobic methane- and ammonia-oxidizing microorganisms naturally associated with wetland plant (Carex comosa) roots was examined in this study. In bench-scale microcosm experiments with washed (soil free) Carex comosa roots, the activity of root-associated methane- and ammonia-oxidizing microorganisms, which were naturally present on the root surface and/or embedded within the roots, was investigated. Significant methane and ammonia oxidation were observed reproducibly in batch reactors with washed roots incubated in growth media, where methane oxidation developed faster (2 weeks) compared to ammonia oxidation (4 weeks) in live microcosms. After enrichment, the methane oxidizers demonstrated their ability to degrade 150 μg l(-1) TCE effectively at 1.9 mg l(-1) of aqueous CH(4). In contrast, ammonia oxidizers showed a rapid and complete inhibition of ammonia oxidation with 150 μg l(-1) TCE at 20 mg l(-1) of NH(4)(+)-N, which may be attributed to greater sensitivity of ammonia oxidizers to TCE or its degradation product. No such inhibitory effect of TCE degradation was detected on methane oxidation at the above experimental conditions. The results presented here suggest that microorganisms associated with wetland plant roots can assist in the natural attenuation of TCE in contaminated aquatic environments.

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Chlorierte Kohlenwasserstoffe im Grundwasser

Kirchholtes¹,

Ufrecht²

2015

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Cometabolic degradation of TCE in enriched nitrifying batch systems

Cited by 33 publications

References 13 publications

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

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

Aerobic cometabolic degradation of trichloroethene by methane and ammonia oxidizing microorganisms naturally associated with Carex comosa roots

Chlorierte Kohlenwasserstoffe im Grundwasser

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