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Reductive dechlorination of tetrachloroethylene (PCE .

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.

Anaerobic pilot-scale treatment of a tetrachloethylene .

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].

Modeling of a multiannular photocatalytic reactor for .

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.

Innovative membrane reactor on an industrial scale - PCE .

Innovative membrane reactor on an industrial scale - PCE .

Furthermore, the new reactor design not only guarantees considerably smaller and even safer production plants. It also helps to strengthen the leading role in the market, because in future, the investment costs (CAPEX) and operating costs (OPEX) of systems of .

Chernobyl New Safe Confinement - Wikipedia

Chernobyl New Safe Confinement - Wikipedia

The New Safe Confinement (NSC or New Shelter) is a structure built to confine the remains of the number 4 reactor unit at the Chernobyl Nuclear Power Plant, in Ukraine, which was destroyed during the Chernobyl disaster in 1986. The structure also encloses the temporary Shelter Structure (sarcophagus) that was built around the reactor immediately after the disaster.

Catalytic Destruction of PCE and TCE inCatalytic .

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

Dechlorination of High Concentrations of .

Dechlorination of High Concentrations of .

Reductive dechlorination of PCE to cis-dichloroethene was sustained in the reactors receiving H2 (1% H2 and 50% H2), while negligible dechlorination was observed in control reactors ( N2).

Photochemical Destruction of Tetrachloroethylene and .

Photochemical Destruction of Tetrachloroethylene and .

A novel pilot-scale photochemical reactor is utilized to carry out vapor-phase tetrachloroethylene (PCE) and trichloroethylene (TCE) destruction experiments from the exhaust of a groundwater remediation air stripper. The cylindrical-shaped stainless steel photochemical reactor has an inner diameter of 32 cm and a length of 105 cm. Low-pressure .

Anaerobic pilot-scale treatment of a tetrachloethylene .

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].

About Us - PCE Pacific

About Us - PCE Pacific

PCE Pacific has sales and service professionals located strategically throughout our territory, providing responsive, local support to serve all of our customers' process automation needs.. As an Emerson Impact Partner, PCE is able to combine a very strong local presence and the unique understanding of our customers' business objectives, with the global capabilities of Emerson, allowing PCE to .

Improved Dechlorinating Performance of Upflow Anaerobic .

Improved Dechlorinating Performance of Upflow Anaerobic .

Dechlorination of tetrachloroethene, also known as perchloroethylene (PCE), was investigated in an upflow anaerobic sludge blanket (UASB) reactor after incorporation of the strictly anaerobic, reductively dechlorinating bacterium Dehalospirillum multivorans into granular sludge. This reactor was compared to the reference 1 (R1) reactor, where the granules were autoclaved to remove all .

Desorption Behavior of Trichloroethylene and .

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 .

Packed Bed Reactors (PBRs)

Packed Bed Reactors (PBRs)

From the PFR module we have. The catalyst weight and rector volume are related by the catalyst bulk density (g/dm 3). The reaction rate per unit volume and the reaction rate per unit catalyst weight are also related by the bulk density, r b The differential form of the PBR mole balance is

Performance evaluation of an Anaerobic Migrating Blanket .

Performance evaluation of an Anaerobic Migrating Blanket .

Conclusions: The AMBR reactor, which provides full‑scale studies and uses real industrial wastewater polluted with PCE, is a simple, efficient, and reliable method for the treatment of PCE.

Final Report | Application of Anaerobic and Multiple .

Final Report | Application of Anaerobic and Multiple .

Very little transformation of PCE was observed with the acetate enrichment culture; however, complete removal of PCE was observed with the lactate enrichment culture. When CT was fed at 2 mM with 1,1,1-TCA to the reactor containing the acetate enrichment culture, there were some inhibitory effects as chloroform (CF) and 1,1,-dichloroethane .

Reductive Biotransformation of Tetrachloroethene to Ethene .

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, .

Catalytic Dechlorination of Gas-phase Perchloroethylene .

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.

Biodegradation of tetrachloroethylene in upflow anaerobic .

Biodegradation of tetrachloroethylene in upflow anaerobic .

The maximum PCE dechlorination rate (q(max)), was 14.28 mg PCE/g VSS d and the half velocity coefficient, (K-s), was 0.417 mg PCE/l under steady state conditions. The UASB reactor may prove to be a potential wastewater treatment process for PCE containing wastewater. (C) 1999 .

Degradation of Trichloroethylene and Tetrachloroethylene .

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.

Photosonolysis of TCA, TCE, and PCE in Flow-Through .

Photosonolysis of TCA, TCE, and PCE in Flow-Through .

TCE and PCE were more readily degraded than TCA, suggesting that double-bond cleavage is one of the initial degradation pathways. With the reactor specifications used, the photosonolysis process can produce water meeting the drinking water standard (MCLs of 5 μg/L) for TCE and PCE with a removal efficiency of approximately 90%.

PCE Oxidation by Sodium Persulfate in the Presence of .

PCE Oxidation by Sodium Persulfate in the Presence of .

Nov 11, 2010 · Batch reactor experiments were performed to determine the effects of solids on the oxidation of tetracholoroethylene (PCE) by sodium persulfate in aqueous solution. Based on the rates of PCE degradation and chloride formation, PCE oxidation by heat-activated sodium persulfate at 50 °C in the presence of solids ranged from no detectable oxidation of PCE to the levels observed in water-only .

Degradation of tetrachloroethene by bacterial consortia in .

Degradation of tetrachloroethene by bacterial consortia in .

After 12 hours, 92 % of PCE was degraded in reactors with IIn1 and IIn2, with the production of TCM and TCA. Degradation tests using cells suspension were conducted to evaluate the efficiency of each isolate in PCE degradation. Isolate I8 from In2 (I8In2), identified as Comamonas sp., showed 68 % efficiency in the PCE degradation.

Performance evaluation of an Anaerobic Migrating Blanket .

Performance evaluation of an Anaerobic Migrating Blanket .

Conclusions: The AMBR reactor, which provides full‑scale studies and uses real industrial wastewater polluted with PCE, is a simple, efficient, and reliable method for the treatment of PCE.

Reduction of tetrachloroethylene and trichloroethylene by .

Reduction of tetrachloroethylene and trichloroethylene by .

PCE and TCE, however, few studies report the solid-state ratio when performing experiments with magnetite. In this study, we measured PCE/TCE removal in batch reactors as a function of the Fe. 2+ /Fe. 3+ ratio, solids loading, pH, and aqueous Fe(II) concentration. Our results indicate that magnetite at the most favorable ratio (x = Fe. 2+ /Fe. 3+

Short Communication Co-Digestion of Glycerol with .

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

(PDF) Anaerobic hybrid reactor: A promising technology for .

(PDF) Anaerobic hybrid reactor: A promising technology for .

A laboratory scale study was conducted to study the biodegradation of tetrachloroethylene (PCE) in Anaerobic Hybrid Reactor (AHR). The acclimatization study revealed that more than 99.85% of PCE .

Chernobyl New Safe Confinement - Wikipedia

Chernobyl New Safe Confinement - Wikipedia

The New Safe Confinement (NSC or New Shelter) is a structure built to confine the remains of the number 4 reactor unit at the Chernobyl Nuclear Power Plant, in Ukraine, which was destroyed during the Chernobyl disaster in 1986. The structure also encloses the temporary Shelter Structure (sarcophagus) that was built around the reactor immediately after the disaster.

Oxidation of PCE with a UV LED Photocatalytic Reactor .

Oxidation of PCE with a UV LED Photocatalytic Reactor .

Jan 10, 2005 · UV LED's with a peak wavelength of 375 nm were tested for perchloroethylene (PCE) photocatalytic oxidation over Degussa P–25 TiO 2. At a UV light output of only 49 μW/cm 2, the designed reactor delivers a PCE conversion of up to 43 %. If the UV LED price continues to drop, it is very likely that UV LED's will replace UV lamps as the favored .

Photochemical Remediation of Tetrachloroethylene: Reactor .

Photochemical Remediation of Tetrachloroethylene: Reactor .

Jan 01, 2004 · A custom designed pilot-scale photochemical remediation reactor is constructed for remediation of vapor-phase volatile organic halocarbons (VOHs), particularly chlorinated hydrocarbons such as PCE (tetrachloroethylene).

Packed Bed Reactors (PBRs)

Packed Bed Reactors (PBRs)

From the PFR module we have. The catalyst weight and rector volume are related by the catalyst bulk density (g/dm 3). The reaction rate per unit volume and the reaction rate per unit catalyst weight are also related by the bulk density, r b The differential form of the PBR mole balance is