Henry’s law constants of chlorinated solvents at elevated temperatures

Chen, Fei; Freedman, David L.; Falta, Ronald W.; Murdoch, Lawrence C.

doi:10.1016/j.chemosphere.2011.10.004

Cited by 54 publications

(28 citation statements)

References 20 publications

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“…H 2 was analyzed by injecting 50 lL of headspace with a gas-tight syringe in a PerkinElmer Auto System gas chromatograph (4.6 m Â 2.1 mm stainless steel column packed with 60/80 Carboxen-1000 support Supelco; N 2 carrier gas 40 mL/min; oven temperature 225°C; thermal conductivity detector (TCD) temperature 250°C). Headspace concentrations were converted to aqueous-phase concentrations using tabulated Henry's law constants (Chen et al, 2012). …”

Section: Methodsmentioning

confidence: 99%

Bioelectrochemically-assisted reductive dechlorination of 1,2-dichloroethane by a Dehalococcoides- enriched microbial culture

Leitão

Rossetti

Nouws

et al. 2015

Bioresource Technology

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g r a p h i c a l a b s t r a c t Keywords:Bioelectrochemical dechlorination 1,2-Dichloroethane Reductive dechlorination Microbial biocathode a b s t r a c tThe aim of this study was to verify the possibility to use a polarized graphite electrode as an electron donor for the reductive dechlorination of 1,2-dichloroethane, an ubiquitous groundwater contaminant. The rate of 1,2-DCA dechlorination almost linearly increased by decreasing the set cathode potential over a broad range of set cathode potentials (i.e., from À300 mV to À900 mV vs. the standard hydrogen electrode). This process was primarily dependent on electrolytic H 2 generation. On the other hand, reductive dechlorination proceeded (although quite slowly) with a very high Coulombic efficiency (near 70%) at a set cathode potential of À300 mV, where no H 2 production occurred. Under this condition, reductive dechlorination was likely driven by direct electron uptake from the surface of the polarized electrode. Taken as a whole, this study further extends the range of chlorinated contaminants which can be treated with bioelectrochemical systems.

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Section: Methodsmentioning

confidence: 99%

Bioelectrochemically-assisted reductive dechlorination of 1,2-dichloroethane by a Dehalococcoides- enriched microbial culture

Leitão

Rossetti

Nouws

et al. 2015

Bioresource Technology

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“…where the coefficients A, B and C are available in the literature (Chen et al, 2012). k [m/s] and k [m/s] are the gas and liquid phase exchange constants, respectively that for a reference temperature equal to 25 o C can be estimated as (Southworth, 1979):…”

Section: Volatilisationmentioning

confidence: 99%

Dilution and volatilization of groundwater contaminant discharges in streams

Aisopou¹,

Bjerg²,

Sonne³

et al. 2015

Journal of Contaminant Hydrology

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An analytical solution to describe dilution and volatilisation of a continuous groundwater contaminant plume into streams is developed for risk assessment. The location of groundwater plume discharge into the stream (discharge through the side versus bottom of the stream) and different distributions of the contaminant plume concentration (Gaussian, homogeneous or heterogeneous distribution) are considered. The model considering the plume discharged through the bank of the river, with a uniform concentration distribution was the most appropriate for risk assessment due to its simplicity and limited data requirements. The dilution and volatilisation model is able to predict the entire concentration field, and thus the mixing zone, maximum concentration and fully mixed concentration in the stream. It can also be used to identify groundwater discharge The dilution model can also provide recommendations for sampling locations and the size of impact zones in streams. This is of interest for regulators, for example when developing guidelines for the implementation of the European Water Framework Directive.3

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“…All chemicals were used without any purifications. Chloroform and dichlorobromomethane, having Henry's law constant at 25°C are K H of 3.67 × 10 −3 and 2.12 × 10 −3 atm·m 3 /mol, respectively . Ethanol is highly miscible in water with a K H value of 5.1 × 10 −6 atm·m 3 /mol at 25°C .…”

Section: Methodsmentioning

confidence: 99%

“…Chloroform and dichlorobromomethane, having Henry's law constant at 25 • C are K H of 3.67 × 10 −3 and 2.12 × 10 −3 atm·m 3 /mol, respectively. 40 Ethanol is highly miscible in water with a K H value of 5.1 × 10 −6 atm·m 3 /mol at 25 • C. 41 The first study was BTF-A done using ethanol as a co-metabolite. The second set of studies were conducted using BTF-B that was fed continuously with the same mixtures of THMs, and Surfactin was seeded without the presence of co-metabolite.…”

Section: Volatile Organic Compounds and Dna Extractionsmentioning

confidence: 99%

Effectiveness of biosurfactant for the removal of trihalomethanes by biotrickling filter

Mezgebe

Sorial

Sahle‐Demessie

2019

Engineering Reports

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In this study, the biodegradation of a mixture of two trihalomethane (THM) compounds, chloroform (CF) and dichlorobromomethane (DCBM), was evaluated using two laboratory‐scale biotrickling filters (BTFs). The two BTFs, hereby designated as “BTF‐A” and “BTF‐B,” were run parallel and used ethanol as co‐metabolite at different loading rates (LRs), and a lipopeptide‐type biosurfactant that was generated by the gram‐positive bacteria, Surfactin, respectively. The results using BTF‐A showed that adding ethanol at a higher rate of 4.59 g/(m3 h) resulted in removal efficiencies of 85% and 87% for CF and DCBM, respectively. Conversely, for the same LR, the use of Surfactin without ethanol (BTF‐B) showed comparable removal efficiencies of 85% and 80% for CF and DCBM, respectively. The maximum rate constant for CF and DCBM for the BTF‐A was 0.00203 s−1 and 0.0022 s−1, respectively. For the same THMs LR, similar reaction rate constants resulted for the BTF‐B. Further studies were conducted to investigate and understand the microbial diversity within both BTFs. The result indicated that for BTF with co‐metabolite, Fusarium sp. was the most dominant fungi over 98% followed by F. Solani with less than 2%. F. oxysporum and Fusarium sp. were instead the dominant fungi for the BTF with Surfactin. Before introducing the Surfactin into the BTF, the batch experiment was conducted to evaluate the effectiveness of synthetic surfactant as compared to a biosurfactant (Surfactin). In this regard, vials with Surfactin showed better performance than vials with Tomadol 25‐7 (synthetic surfactant).

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Henry’s law constants of chlorinated solvents at elevated temperatures

Cited by 54 publications

References 20 publications

Bioelectrochemically-assisted reductive dechlorination of 1,2-dichloroethane by a Dehalococcoides- enriched microbial culture

Bioelectrochemically-assisted reductive dechlorination of 1,2-dichloroethane by a Dehalococcoides- enriched microbial culture

Dilution and volatilization of groundwater contaminant discharges in streams

Effectiveness of biosurfactant for the removal of trihalomethanes by biotrickling filter

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