Effect of pore velocity on biodegradation of cis-dichloroethene (DCE) in column experiments

Mendoza‐Sanchez, Itza; Autenrieth, Robin L.; McDonald, Thomas J.; Cunningham, J. E.

doi:10.1007/s10532-009-9307-6

Cited by 9 publications

(20 citation statements)

References 43 publications

(49 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The overall biodegradation process was observed to be much more sensitive to the specific utilization rate q than to the biofilm diffusion coefficients D f j . In donor-limited conditions, biodegradation initially appears successful, but after some time, the biodegradation begins to fail; this predicted behavior is consistent with previous experimental results (Mendoza-Sanchez et al 2010). Overall, the model results suggest that processes occurring at the biofilm scale can have important effects on the overall (macroscopic) biodegradation process, and hence models for biodegradation must incorporate descriptions of these biofilm-scale processes.…”

Section: Discussionsupporting

confidence: 87%

“…The initial and boundary conditions may differ depending on the physics of the problem to be considered. Here, we consider the case of contaminated groundwater pumped through columns of porous media, as was described recently elsewhere (Mendoza-Sanchez et al 2010). The columns are initially considered to contain no contamination.…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

“…This predicted behavior is somewhat surprising, but it has, in fact, been observed experimentally under conditions that were suspected to be donor-limited: see Figs. 2d or 5 of Mendoza-Sanchez et al (2010). The critical reason why the biodegradation deteriorates appears to be that the microbial population, X , cannot be sustained without an adequate supply of hydrogen, and as X decreases, the conversion of DCE to ETH deteriorates.…”

Section: Comparison Of Biodegradation Under Different Rate-limiting Cmentioning

confidence: 99%

See 2 more Smart Citations

Efficient Algorithms for Modeling the Transport and Biodegradation of Chlorinated Ethenes in Groundwater

Mendoza‐Sanchez

Cunningham

2011

Transp Porous Med

Self Cite

View full text Add to dashboard Cite

Predicting the fate of chlorinated ethenes in groundwater requires the solution of equations that describe both the transport and the biodegradation of the contaminants. Here, we present a model that accounts for (1) transport of chlorinated ethenes in flowing groundwater, (2) mass transfer of contaminants between mobile groundwater and stationary biofilms, and (3) diffusion and biodegradation within the biofilms. Equations for biodegradation kinetics account for biomass growth within the biofilms, the effect of hydrogen on dechlorination, and competitive inhibition between vinyl chloride and cis-dichloroethene. The overall model consists of coupled, non-linear, partial differential equations; solution of such a model is challenging and requires innovative numerical algorithms. We developed and tested two new numerical algorithms to solve the equations in the model; these are called system splitting with operator splitting (SSOS) and system splitting with Picard iteration (SSPI). We discuss the conditions under which one of these algorithms is superior to the other. The contributions of this paper are as follows: first, we believe that the mathematical model presented here is the first transport model that also accounts for diffusion and nonlinear biodegradation of chlorinated ethenes in biofilms; second, the SSOS and SSPI are new computational algorithms developed specifically for problems of transport, mass transfer, and non-linear reaction; third, we have identified which of the two new algorithms is computationally more efficient for the case of chlorinated ethenes; and finally, we applied the model to compare the biodegradation behavior under diffusion-limited, metabolism-limited, and hydrogen-limited (donor-limited) conditions.

show abstract

Section: Discussionsupporting

confidence: 87%

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

Section: Comparison Of Biodegradation Under Different Rate-limiting Cmentioning

confidence: 99%

See 1 more Smart Citation

Efficient Algorithms for Modeling the Transport and Biodegradation of Chlorinated Ethenes in Groundwater

Mendoza‐Sanchez

Cunningham

2011

Transp Porous Med

Self Cite

View full text Add to dashboard Cite

show abstract

“…On the contrary, if diffusion becomes the dominant mode of substrate transport, as most microorganisms are attached to sediment particles, increased flow velocity may lead to decreased biodegradation [6]. For example, Mendoza-Sanchez et al (2010) [25] found that at higher flow velocity, the degradation of cis-DCE was more efficient than at lower velocity. They explained this fact by the lower flux of the electron donor (yeast extract) enabling sustained dechlorination.…”

mentioning

confidence: 99%

Column Experiments on Sorption Coefficients and Biodegradation Rates of Selected Pharmaceuticals in Three Aquifer Sediments

Kiecak

Breuer

Stumpp

2019

Water

View full text Add to dashboard Cite

The presence of pharmaceuticals in the environment, and in groundwater, has been recognized as a great environmental concern. Biodegradation and sorption are the main processes leading to the removal of contamination from the water phase. The aim of this study was to determine the transport processes of selected pharmaceuticals (antipyrine, atenolol, carbamazepine, caffeine, diclofenac, ketoprofen, sulfamethoxazole) in selected sediments (coarse sand, medium sand, sandy loam) in laboratory experiments. Moreover, the impact of flow velocities on the sorption and degradation rates of the selected compounds was studied. Column experiments were performed at three flow velocities, under abiotic and biotic conditions, applying conservative (bromide) and reactive tracers (pharmaceuticals). From the breakthrough curves, retardation factors and degradation rates were determined and the influence of variable flow conditions on transport parameters was evaluated. Low observed concentrations and recoveries of atenolol indicated a strong influence of sorption on its transport. Diclofenac, caffeine, and carbamazepine were also affected by sorption but to a lesser extent. Sulfamethoxazole, ketoprofen, and antipyrine were recovered nearly completely, indicating an almost conservative transport behavior. Biodegradation was small for all the compounds, as the results from biotic and abiotic column experiments were similar. Transport of the tested pharmaceuticals was not influenced by different flow velocities, as similar modelled degradation rates and retardation factors were found for all tested flow velocities.often overlooked, which corresponds to ignoring the effect of different flow velocities on the fate of contaminants. Reducing the complexity at field sites, laboratory experiments in column studies can help to identify the specific sorption and biodegradation rates of pharmaceuticals.Column experiments are frequently used to study the transport of contaminants like micropollutants, such as pharmaceuticals [7]. Numerous studies have proven the usefulness of column experiments, as they are relatively fast, uncomplicated to manage, and their boundary conditions can be easily controlled. Moreover, different scenarios may be simulated, for example, managed aquifer recharge [8], seepage through the vadose zone [9], transport through an aquifer [10,11], and bank filtration [12][13][14].Column studies have been utilized to study the influence of physico-chemical conditions within an aquifer on pharmaceutical transport, with an emphasis on changes in pH [11], redox conditions [13,15], or temperature [16]. Also, the influence of the sediment type on transport behavior was studied and the following properties were found particularly crucial: Sediment grain size [17], available mineral surfaces [18], or total organic carbon content [19]. However, little is known on the impact of flow velocity on pharmaceutical transport in groundwater [20].The effect of pore-water velocity on contaminant transport has been presented in the literatur...

show abstract

“…Prommer et al (2008) investigated the degradation of TCE in groundwater by use of zero-valent iron, and they analyzed for TCE and all three DCE isomers via headspace GC/FID; separate calibration curves were determined for all four compounds. Haest et al (2010) and Mendoza-Sanchez et al (2010) both studied biologically mediated reductive dechlorination of TCE in water; both groups analyzed for TCE, cis-DCE, and VC by headspace GC/FID, with separate calibration curves generated for each. These are just a few examples in which multiple chlorinated ethenes were analyzed by headspace GC/FID, with separate calibration curves generated for each.…”

Section: Significance and Implications Of Resultsmentioning

confidence: 99%

Simplified Analysis of Chlorinated Ethenes in Water Samples by Gas Chromatography with Flame Ionization Detection

Ticknor¹,

Elsayed-Ali²,

Kim³

et al. 2013

Environmental Engineering Science

Self Cite

View full text Add to dashboard Cite

Chlorinated ethenes are among the most common environmental contaminants and are known or suspected carcinogens. This class of compounds includes perchloroethene (PCE), trichloroethene (TCE), and their breakdown products, including dichloroethene (DCE) isomers and vinyl chloride (VC). Engineers and scientists must be able to measure concentrations of these chemicals in water samples to assess site contamination, monitor clean-up progress, and test possible remediation technologies. Gas chromatography with flame ionization detection (GC/ FID) is a common method for measuring these contaminants in environmental samples. In this study, we tested the hypothesis that FID response factors are equal for all chlorinated ethene compounds. The rationale for the investigation was that if the hypothesis is correct, a single calibration curve can be used for GC/FID analysis of all chlorinated ethene compounds, saving time and money during sample analysis. Based on our measurements, a single calibration curve (FID response versus mass of analyte injected) is applicable to analysis of PCE, TCE, and all three DCE isomers (r 2 = 0.990, n = 50 measurements), allowing for simplified quantification of those chemicals. However, the apparent FID response factor for VC was lower by *40%, indicating that a separate calibration curve would need to be used to accurately estimate the VC concentration in water samples. The difference in the apparent VC response factor is caused predominantly by losses of VC to volatilization during the analysis.

show abstract

Effect of pore velocity on biodegradation of cis-dichloroethene (DCE) in column experiments

Cited by 9 publications

References 43 publications

Efficient Algorithms for Modeling the Transport and Biodegradation of Chlorinated Ethenes in Groundwater

Efficient Algorithms for Modeling the Transport and Biodegradation of Chlorinated Ethenes in Groundwater

Column Experiments on Sorption Coefficients and Biodegradation Rates of Selected Pharmaceuticals in Three Aquifer Sediments

Simplified Analysis of Chlorinated Ethenes in Water Samples by Gas Chromatography with Flame Ionization Detection

Contact Info

Product

Resources

About