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Anaerobic pilot-scale treatment of a tetrachloethylene .

The reactor took 181 days to get acclimatised for influent PCE concentration of 50 mg/l at which the percentage PCE reduction was 99.92 [+ or -] 0.01%. Chu and Jewell (1994), reported that influent PCE concentration of 8.2-26 mg/l were reduced to less than 0.2 mg/l (>98% removal) using anaerobic attached film expanded bed reactor [23].

Kinetics and mechanism of oxidation of tetrachloroethylene .

The PCE–KMnO 4 kinetic experiments were conducted in a 100 ml gas-tight glass syringe reactor where a magnetic stir bar was placed in the reactor ().The reactor was connected to a sampling/injecting syringe by means of a control valve and luer-lock fitting. A zero headspace condition in the reactor was maintained during the experiments by moving the plungers of both the sampling and reactor .

Process Control - PCE Pacific

Reactors Back. Compressors; Vibration Monitoring Asset Monitoring Overpressure Protection Anti-Surge Technology Compressors Fertilizers . PCE Pacific, Inc. 22011 26th Avenue SE Bothell, WA 98021. Phone: 425-487-9600 Emergency Support and Service . M-F .

Oxidation of tetrachloroethylene in a bubble column .

Mass transfer of tetrachloroethylene (PCE) gas, followed by a free-OH radical reaction in the liquid phase, was studied in a bubble column reactor equipped with a UV light source and containing aqueous H 2 O 2 as the reacting medium. Degradation of PCE in the liquid phase was found to follow pseudo-first-order kinetics, and the optimal ratio of H 2 O 2 /PCE leading to the highest oxidation .

UV-bubble column reactor (UV-BCR) for photolytic removal .

Alibegic, D, Tsuneda, S & Hirata, A 2003, ' UV-bubble column reactor (UV-BCR) for photolytic removal of tetrachloroethylene (PCE) from the vapor phase: Methodological approach ', JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, vol. 36, no. 2, pp. 178-186.

Reductive Biotransformation of Tetrachloroethene to Ethene .

PCE was introduced into the reactor at a loading rate of 3 mg/l d. PCE removal increased from 51+/-5% to 87+/-3% when HRT increased from 1 to 4 d, .

UniTech R3 Nuclear Workshop

critical path, dose, and PCE reductions. ∗ This presentation will provide details of critical path savings, dose, and PCE reduction. ∗ It is intended as a template for applying and removing the InstaCoteTM ML-2 to PWR or BWR Reactor Cavities with the understanding that all Reactor Cavities are not all standard

Reductive Dechlorination of PCE and TCE by Vitamin B12 and .

The reductive dechlorination of tetrachloroethene (PCE) and trichloroethene (TCE) catalyzed by vitamin B 12 was examined when zero valent metals (ZVMs) were used as bulk electron donors in batch reactors. UV-visible spectra showed that zinc reduces vitamin B 12 Co(III) to vitamin B 12 Co(I) through B 12 Co(II) and iron reduces vitamin B 12 Co(III) to vitamin B 12 Co(II).

(PDF) Evaluation of Bioreactor Performance for Pump-and .

Tetrachloroethene (PCE) and trichloroethene (TCE) were added to reactors and maintained at 20 μM each in leachate to simulate the long-term exposure of refuse microorganisms to CAHs in landfills.

Catalytic Dechlorination of Gas-phase Perchloroethylene .

Feb 21, 2008 · The validity of a new method to destroy gas-phase perchloroethylene (PCE) is demonstrated at bench scale using a fixed-bed reactor that contains a Pt/Rh catalyst. Hydrogen and oxygen were simultaneously fed to the reactor together with PCE. The conversion efficiencies of PCE were sensitive to H 2 /O 2 ratio and reactor temperature.

Experimental Results on the Destruction of PCE using a .

A vapor-phase tetrachloroethylene (PCE) destruction experiment using a newly constructed photo-chemical remediation (PCR) reactor is performed. One of the applications for the PCR reactor is subsurface remediation of volatile organic compounds (VOCs). Ultraviolet (UV) light, when emitted at an effective absorption frequency (primary wavelengths of 185 and 254 nm), cleaves a VOC's carbon .

Reductive dechlorination of perchloroethylene using .

The reactor was then fed PCE, glucose and methanol to enrich for a PCE dechlorinating consortium. This DASB reactor was able to dechlorinate reductively between 6.2 and 72 mgIL PCE with 95 to 98% of the influent PCE recovered as ethylene.The DASH reactor operated at a range of hydraulic residence times ranging from 3.8 hours, for the low PCE .

Catalytic Destruction of PCE and TCE inCatalytic .

Reactor Model Assumptions rPCE =−kθPCE Reaction is first order θ PCE = bCPCE Adsorption represented by 1+bC Langmuir isotherm PCE Fast adsorption/desorption dCPCE =τ No interspecies competition − r for sites PCE k = 1st order reaction constant C ln(1− x) − x =−C kbτ r = reaction rate 0 b 0 τ = reactor residence time

Shock tube models — MUM-PCE 0.1 documentation

Shock tube delay ¶ class shock_tube_utils.ShockTubeDelay (T, Patm, composition, reactor_model, chemistry_model, critical_function, crit_ID=None, critical_value=None, critical_rise=None, initial_timestep=1e-05, loglevel=None, **kwargs) ¶. A model for determining the delay time in shock tube ignition. This class provides a model for calculating a shock tube ignition delay time in Cantera.

Catalytic removal of perchloroethylene (PCE) over .

The reactor is a 6 mm o.d. Pyrex glass tube operated in the mode of down flow. A reactant mainly containing air with 30 ppm of PCE was fed into the reactor containing 60/80 mesh size catalyst at the flow rate of 600 ml/min, equivalent to the reactor space velocity of 30 000 h −1. The reaction temperatures were varied from 150 to 450°C under .

Tetrachloroethene Dehalorespiration and Growth of .

Tetrachloroethene (PCE) dehalorespiration was investigated in a continuous coculture of the sulfate-reducing bacterium Desulfovibrio fructosivorans and the dehalorespiring Desulfitobacterium frappieri TCE1 at different sulfate concentrations and in the absence of sulfate. Fructose (2.5 mM) was the single electron donor, which could be used only by the sulfate reducer.

Short Communication Co-Digestion of Glycerol with .

The feed (CG and PCE mixture) was then pumped into the AnPB reactor at a rate needed to achieve a hydraulic residence time (HRT) of 2 days in the anaerobic (AnPB) reactor. The HRT is a key processing parameter defining the system performance as it determines the contact time of the crude glycerol with microbiota in the system reactors. The

Degradation of Trichloroethylene and Tetrachloroethylene .

Dec 12, 2012 · The treatment process was operated using UV or US individually, and UV and US concurrently (UVUS). The solutions contaminated with TCE or PCE were exposed to UV light emitted from Hg-arc lamps surrounding the quartz reactor vessel, and to acoustic waves from a US horn located at the bottom of the reactor vessel.

TETRACHLOROETHENE (PCE) DEHALOGENATION BY .

A 24-hour cycle (22 hours for anoxic and 2 hours for aerobic) could completely reduce PCE with a feeding concentration of up to 100 µg/L. In the reactor, acetate, methanol, and phenol were growth substrates and electron donors, and nitrate and PCE were elector acceptors. Key words:

Short Communication Co-Digestion of Glycerol with .

The feed (CG and PCE mixture) was then pumped into the AnPB reactor at a rate needed to achieve a hydraulic residence time (HRT) of 2 days in the anaerobic (AnPB) reactor. The HRT is a key processing parameter defining the system performance as it determines the contact time of the crude glycerol with microbiota in the system reactors. The

Modeling of a multiannular photocatalytic reactor for .

Jan 17, 2006 · The reactor shows good effectiveness for the PCE degradation in polluted moist air. A radiation field model was developed to predict the local superficial rate of photon absorption (LSRPA) at each point on the reactor catalytic walls, which is needed to evaluate the local reaction rate.

Desorption Behavior of Trichloroethylene and .

the site of fabrication of reactor fuel and target assemblies for SRS reactors that resulted in large quantities of TCE and PCE being released to a process sewer .

Comparative Study of the Effect of Four (4) ISCO Oxidants .

Sep 19, 2019 · The control reactor did not show significant PCE or EB removal (Figures 1 and 2). The CaO2-based Fenton product (Cool-Ox®) showed the greatest destruction of PCE (96%) and EB (95%) (Table 2), though rates of oxidation were considerably less than initial rates for the liquid HP-based Fenton and permanganate systems.

Oxidation of Tetrachloroethylene in a Bubble Column .

Mass transfer of tetrachloroethylene (PCE) gas, followed by a free‐OH radical reaction in the liquid phase, was studied in a bubble column reactor equipped with a UV light source and containing aqueous H 2 O 2 as the reacting medium. Degradation of PCE in the liquid phase was found to follow pseudo‐first‐order kinetics, and the optimal ratio of H 2 O 2 /PCE leading to the highest .

Polymerase chain reaction - Wikipedia

Polymerase chain reaction (PCR) is a method widely used to rapidly make millions to billions of copies of a specific DNA sample, allowing scientists to take a very small sample of DNA and amplify it to a large enough amount to study in detail. PCR was invented in 1984 by the American biochemist Kary Mullis at Cetus Corporation.It is fundamental to much of genetic testing including analysis of .

PCE-II UNIT-III-A | Chemical Reactor | Cracking (Chemistry .

The reactors normally operate at 12-15 centimeters Hg absolute pressure and approximately 1100-1260 F (600-680 C). Three or more reactors can be used to simulate continuous operation: while the first reactor is on-line, the second is being regenerated, and the third is being purged prior to regeneration.

Reductive dechlorination of tetrachloroethylene (PCE .

Abstract. A biomimetic system has been developed for the reductive dechlorination of tetrachloroethylene (PCE). PCE was dechlorinated to trichloroethylene (TCE) and 1,2-dichloroethylene (DCE) in the presence of dithiothreitol or Ti (III) citrate and catalytic amounts of cyanocobalamin in both homogeneous reaction mixtures and packed bed reactor systems.

Reductive dechlorination of perchloroethene (PCE) and .

The conversion of PCE to cis-DCE was observed within 12 days of reactor operation with the addition of lactate: PCE ratio was 620: 1 (mg/mg) in phase I stimulation. The complete dechlorination of PCE to ethene was detected in the 2nd column effluent after 70 days during phase II while in the 1st column after 30 days operation of phase IV.

Comparative Study of the Effect of Four (4) ISCO Oxidants .

Sep 19, 2019 · The control reactor did not show significant PCE or EB removal (Figures 1 and 2). The CaO2-based Fenton product (Cool-Ox®) showed the greatest destruction of PCE (96%) and EB (95%) (Table 2), though rates of oxidation were considerably less than initial rates for the liquid HP-based Fenton and permanganate systems.

Oxidation of tetrachloroethylene in a bubble column .

Mass transfer of tetrachloroethylene (PCE) gas, followed by a free-OH radical reaction in the liquid phase, was studied in a bubble column reactor equipped with a UV light source and containing aqueous H 2 O 2 as the reacting medium. Degradation of PCE in the liquid phase was found to follow pseudo-first-order kinetics, and the optimal ratio of H 2 O 2 /PCE leading to the highest oxidation .