Study on the Treatment of Effluents from Paint Industry by Modified Electro-Fenton Process
Ahmed Mostafa Sadek,
Riham Ali Hazzaa,
Mohamed Hussien Abd-El-Magied
Issue:
Volume 4, Issue 1, January 2016
Pages:
1-8
Received:
3 January 2016
Accepted:
11 January 2016
Published:
25 January 2016
Abstract: The main goal of this study is to investigate the effectiveness of modified Electro-Fenton process (EF-Fere) involving ferrous ions regeneration coupled with direct oxidation method on COD reduction of paint manufacturing wastewater. The present Electro-Fenton cell consisted of stainless steel porous cathode and lead anode covered by PbO2 film. The performance was measured through studying the effect of different parameters on the percentage of COD removal such as: ferric ions concentration, initial concentration of wastewater, current density and irradiation of UV light. The parameters showed high COD removal efficiency 99% for highly contaminated wastewater of 13000 mg/l COD in acidic medium pH=2 at continuous H2O2 feeding dosage of 1.4 ml/min and current density = 19 mA/cm2 in presence of UV light.
Abstract: The main goal of this study is to investigate the effectiveness of modified Electro-Fenton process (EF-Fere) involving ferrous ions regeneration coupled with direct oxidation method on COD reduction of paint manufacturing wastewater. The present Electro-Fenton cell consisted of stainless steel porous cathode and lead anode covered by PbO2 film. The...
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Adsorption of Reactive Blue Dye onto Natural and Modified Wheat Straw
Khalid Mokhlif Mousa,
Alaa Hussein Taha
Issue:
Volume 4, Issue 1, January 2016
Pages:
9-15
Received:
5 January 2016
Accepted:
17 January 2016
Published:
29 January 2016
Abstract: Conventional treatment of textile wastewater such as biological treatment discharges will no longer be tolerated and identified as non-biodegradable. Advanced processes such as adsorption and advanced oxidation hold great promise to provide alternative for better treatment and protection of environment. In this study, adsorption process is carried out for both batch (kinetic and isotherm) studies using natural wheat straw (NWS) as low cost adsorbent, modified wheat straw (MWS) and Activated Carbon (AC) for comparing the results. Batch adsorption experiments were conducted on a shaker at 200 rpm, room temperature using 250 mL conical flasks contains 100 mL of dye solution to study the effects of adsorption conditions. The effect of pH was determined by adjusting pH values (2.5 – 10.5). To study the effect of initial dye concentration, six different concentrations of reactive blue dye (5, 20, 30, 50, 70 and 90) mg/L were prepared and used. Results showed that the removal percent using NWS, MWS and AC are; 68%, 92.17% and 90.5% respectively. Equilibrium isotherm experiment were carried at different dosages (0.1 – 1 g) to predict the isotherm model; Langmuir, Freundlich and BET. The experimental data showed that reactive blue is fitted with Freundlich isotherm (1/n = 1.25, 0.67) for both (NWS) and (MWS) respectively, and for (AC) is fitted with Langmuir isotherm. Three kinetic models, were selected to fit the kinetic data; pseudo first, second order and intra-particle diffusion, reactive blue is fitted with intra-particle diffusion model with (NWS) and (MWS), and Pseudo second order for (AC).
Abstract: Conventional treatment of textile wastewater such as biological treatment discharges will no longer be tolerated and identified as non-biodegradable. Advanced processes such as adsorption and advanced oxidation hold great promise to provide alternative for better treatment and protection of environment. In this study, adsorption process is carried ...
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Modelling and Simulation of Gauze Reactor of Ammonia Oxidation
Mohamed Abdel Salam,
Ehssan Nassef,
Eman Elkheriany,
Yehia El Tawel
Issue:
Volume 4, Issue 1, January 2016
Pages:
16-22
Received:
10 January 2016
Accepted:
20 January 2016
Published:
1 February 2016
Abstract: Modelling of catalytic ammonia oxidation reactor for nitric oxide production in nitric acid plant over gauzes of Pt/Rh catalyst was the subject of current study. Viscosity, mass transfer and kinetic equations were used for the gas mixture feeding the reactor, partial pressure and mole fraction of ammonia was essential, also wire diameter was considered to detect platinum losses during oxidation operation. In order to investigate the performance of catalytic oxidation reactor, ordinary equation for determining of conversion yields of ammonia to nitric oxide was solved in mathematical model numerically. Variations of conversion with inlet mixture temperature, mixture concentration, inlet pressure and gauze temperature during cycle were investigated. Platinum losses rate as platinum oxide (PtO2) was studied with gauzes surface temperature by using numerical solution of the mathematical model. Modelling results were compared with an industrial reactor data. Comparing industrial data for all studied variables with those obtained by using mathematical model have shown the higher degree of accuracy of the model to predict the operating values with minimum deviation.
Abstract: Modelling of catalytic ammonia oxidation reactor for nitric oxide production in nitric acid plant over gauzes of Pt/Rh catalyst was the subject of current study. Viscosity, mass transfer and kinetic equations were used for the gas mixture feeding the reactor, partial pressure and mole fraction of ammonia was essential, also wire diameter was consid...
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Kinetics and Mechanism of Silver(I)-Catalyzed Oxidation of Tryptophan by Platinum(IV) in Perchlorate Solutions
Ahmed Fawzy,
Ismail Althagafi
Issue:
Volume 4, Issue 1, January 2016
Pages:
23-29
Received:
15 January 2016
Accepted:
26 January 2016
Published:
25 February 2016
Abstract: The kinetics of oxidation of tryptophan by platinum(IV) was investigated in aqueous perchlorate solutions in the presence of silver(I) catalyst at a constant ionic strength of 2.0 mol dm-3 and at 25°C. The progress of the reaction was followed spectrophotometrically. The reaction did not proceed in the absence of the catalyst. The catalyzed reaction exhibited a first order dependence on both [PtIV] and [AgI] whereas the order with respect to tryptophan concentration was found to be less than unity. Increasing ionic strength and dielectric constant was found to decrease the oxidation rate. The suggested oxidation mechanism involves formation of a silver(I)-tryptophan intermediate complex in a pre-equilibrium step, which confirmed by both spectral and kinetic evidences. The complex reacts with the oxidant by an inner-sphere mechanism leading to decomposition of the complex in the rate-determining step. The final oxidation products of tryptophan were identified as the corresponding aldehyde (indole-3-acetaldehyde), ammonium ion and carbon dioxide.
Abstract: The kinetics of oxidation of tryptophan by platinum(IV) was investigated in aqueous perchlorate solutions in the presence of silver(I) catalyst at a constant ionic strength of 2.0 mol dm-3 and at 25°C. The progress of the reaction was followed spectrophotometrically. The reaction did not proceed in the absence of the catalyst. The catalyzed reactio...
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