scholarly journals Degradation of cyanide, aniline and phenol in pre-treated coke oven wastewater by peroxide assisted electro-oxidation process

2018 ◽  
Vol 78 (10) ◽  
pp. 2214-2227 ◽  
Author(s):  
Hariraj Singh ◽  
Brijesh Kumar Mishra
Keyword(s):  
Hydrogen Peroxide ◽  
Current Density ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Removal Rate ◽  
Operating Cost ◽  
Coke Oven ◽  
Graphite Electrodes ◽  
Electro Oxidation ◽  
Pre Treatment

Abstract The present study explored the feasibility of using graphite electrodes for the electrochemical oxidation of cyanide, thiocyanate, phenol and aniline with hydrogen peroxide. The dosing effects of hydrogen peroxide and current density were examined in the pre-treated coke oven wastewater. It was found that 0.025 M hydrogen peroxide and 13.63 mA/cm2 of current density were more favorable for the removal of 100%, 90%, 71% and 40% cyanide, thiocyanate, phenol and aniline respectively. The increased removal of phenol in the coke oven wastewater was attributed to the pre-treatment of wastewater. Initially, 28% phenol was converted to phenolate ion by air stripping process, which increased the removal rate of phenol by the electro-oxidation process as the removal of phenolate is quite easy compared to phenol. The advanced oxidation process degrades the more toxic cyanide into less toxic intermediate cyanate ions (CNO─), which further cut down into nontoxic end products such as N2, HCO3 and CO2. The experimental results show that the primary mechanisms in the oxidation of cyanide and phenol are mediated electro-oxidation by hydroxyl radicals and hypochlorite ions. The operating cost under the optimized conditions for the removal of 100% cyanide and 71% phenol was estimated to be 616.95 INR/m3.

scholarly journals Fate of Diclofenac and Its Transformation and Inorganic By-Products in Different Water Matrices during Electrochemical Advanced Oxidation Process Using a Boron-Doped Diamond Electrode

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1686 ◽  
Author(s):  
Carolin Heim ◽  
Mohamad Rajab ◽  
Giorgia Greco ◽  
Sylvia Grosse ◽  
Jörg E. Drewes ◽  
...  
Keyword(s):  
Current Density ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Early Stage ◽  
Advanced Oxidation ◽  
Target Compound ◽  
Duration Of Treatment ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
By Products

The focus of this study was to investigate the efficacy of applying boron-doped diamond (BDD) electrodes in an electrochemical advanced oxidation process, for the removal of the target compound diclofenac (DCF) in different water matrices. The reduction of DCF, and at the same time the formation of transformation products (TPs) and inorganic by-products, was investigated as a function of electrode settings and the duration of treatment. Kinetic assessments of DCF and possible TPs derived from data from the literature were performed, based on a serial chromatographic separation with reversed-phase liquid chromatographyfollowed by hydophilic interaction liquid chromatography (RPLC-HILIC system) coupled to ESI-TOF mass spectrometry. The application of the BDD electrode resulted in the complete removal of DCF in deionized water, drinking water and wastewater effluents spiked with DCF. As a function of the applied current density, a variety of TPs appeared, including early stage products, structures after ring opening and highly oxidized small molecules. Both the complexity of the water matrix and the electrode settings had a noticeable influence on the treatment process’s efficacy. In order to achieve effective removal of the target compound under economic conditions, and at the same time minimize by-product formation, it is recommended to operate the electrode at a moderate current density and reduce the extent of the treatment.

Optimizing Potable Water Reuse Systems: Chloramines or Hydrogen Peroxide for UV-Based Advanced Oxidation Process?

2019 ◽  
Vol 53 (22) ◽  
pp. 13323-13331 ◽  
Author(s):  
Kiranmayi P. Mangalgiri ◽  
Samuel Patton ◽  
Liang Wu ◽  
Shanhui Xu ◽  
Kenneth P. Ishida ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Water Reuse ◽  
Potable Water ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation

Reuse of Homogeneous Fenton’s Sludge from Detergent Industry as Fenton’s Catalyst

2013 ◽  
Vol 16 (2) ◽  
Author(s):  
André F. Rossi ◽  
Rui C. Martins ◽  
Rosa M. Quinta-Ferreira
Keyword(s):  
Hydrogen Peroxide ◽  
Hydroxyl Radicals ◽  
Heterogeneous Catalysts ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Iron Catalyst ◽  
Advanced Oxidation ◽  
Detergent Industry ◽  
Oxidizing Agent ◽  
Fenton’S Reaction

AbstractFenton’s reaction is an advanced oxidation process where, classically, hydrogen peroxide is the oxidizing agent and an iron catalyst promotes the formation of hydroxyl radicals (•OH). Among the studies that evaluated different metals as Fenton-like catalysts, our group of investigation has recently used cerium-based solids as heterogeneous catalysts in slurry reaction and, in this work, iron sludge coming from an industrial Fenton’s reactor used for the wastewater depuration of a detergent production factory is being appraised while treating a synthetic effluent containing 0.1 g.L

scholarly journals Optimization of isopropyl alcohol degradation by microwave-induced catalytic oxidation process

2019 ◽  
Vol 9 (3) ◽  
pp. 213-224
Author(s):  
Quynh Thi Phuong Tran ◽  
Chi-Hsu Hsieh ◽  
Tung-Yu Yang ◽  
Hsin-hsin Tung
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Oxidation ◽  
Working Conditions ◽  
Isopropyl Alcohol ◽  
Oxidation Process ◽  
Removal Rate ◽  
Response Variability ◽  
Manufacturing Industries ◽  
Independent Variables ◽  
Central Composite

Abstract Isopropyl alcohol (IPA) is a common waste solvent from the semiconductor and optoelectronic manufacturing industries. The current study assesses the feasibility of microwave-induced catalytic oxidation process for synthetic IPA wastewater. The effect of three independent variables, including oxidant (hydrogen peroxide), initial IPA concentration, and dosage of catalyst (granular activated carbon, GAC) on the IPA removal efficiency, were investigated and optimized by response surface methodology based on central composite design. The estimated optimal working conditions were as follows: [H2O2] <0.132 M, GAC dosage = 108–123 g/L, and initial [IPA] = 0.038–0.10 M. The findings indicated that the dosage of GAC and the initial IPA concentration strongly affected the overall IPA removal. The values of R2 = 0.9948 and adjusted R2 = 0.9901 demonstrated that the response variability could be explained by the model expressing a satisfactory quadratic fit. Finally, the H2O2/GAC/MW process showed a faster and higher IPA removal rate than other processes tested.

Degradation of the Pesticide Chlorpyrifos in Aqueous Solutions with UV/H2O2: Optimization and Effect of Interfering Anions

2014 ◽  
Vol 17 (1) ◽  
Author(s):  
André Gadelha de Oliveira ◽  
Jefferson Pereira Ribeiro ◽  
Juliene Tome de Oliveira ◽  
Denis De Keukeleire ◽  
Maíra Saldanha Duarte ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Aqueous Solutions ◽  
Uv Radiation ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Inorganic Anions ◽  
Pesticide Concentration ◽  
Effects Of Temperature

AbstractThis study investigates the use of an advanced oxidation process (AOP) for removal of the pesticide chlorpyrifos in a recirculated system, especially considering the effects of temperature, hydrogen peroxide dosage, pH, pesticide concentration and added inorganic anions. The results indicate that a temperature of 45 °C gave the best performance using only UV-radiation, while for the UV/H

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