Application of New Synthesized Materials Based on Anionic Clays for Industrial Effluent Decoloration

2013 ◽  
Vol 837 ◽  
pp. 271-276 ◽  
Author(s):  
Laura Dartu ◽  
Carmen Zaharia ◽  
Gabriela Carja
Keyword(s):  
Advanced Oxidation Processes ◽  
Uv Light ◽  
Industrial Effluent ◽  
Advanced Oxidation ◽  
Operating Conditions ◽  
Environmental Applications ◽  
Ferrous Ions ◽  
Oxidation Processes ◽  
Anionic Clays ◽  
Catalyst Type

This work reports hydrotalcite and zinc-substituted hydrotalcite (MeAlLDHs) anionic clays as novel catalytic formulations for some environmental applications regarding specific industrial coloured effluents. In this context, layered double hydroxides, covered or with tailored compositions, were synthesized, characterized using advanced analytical analysis techniques (XRD, FTIR, SEM) and tested in specific environmental applications. More specifically, LDHs samples were tested as catalysts for different treatments of coloured effluents, especially some advanced oxidation processes (i.e.heterogeneous advanced oxidation processes with H2O2of Orange 16 dye-containing effluent). The influence of some operating factors such as catalyst type, concentration of hydrogen peroxide, presence of ferrous ions or UV light, contact time was studied, and the adequate operating values were established. Results show that Orange 16 removal is more than 70%, in specific operating conditions, for two of new tested materials (ZnAlLDH 3:1, and MgAlLDH 3:1). Moreover, the action of UV radiation was found efficient in decomposition of Orange 16 dye in the presence of all four tested catalytic materials, improving with more than 40-50% the color removal.

scholarly journals Performance Analysis of Various Advanced Oxidation Processes on COD Removal from Raw Petroleum Refinery Effluent

2021 ◽  
Vol 43 (7) ◽  
pp. 504-512
Author(s):  
Sri Martini ◽  
Sharmeen Afroze ◽  
Mira Setiawati
Keyword(s):  
Advanced Oxidation Processes ◽  
Petroleum Refinery ◽  
Light Exposure ◽  
Advanced Oxidation ◽  
Operating Conditions ◽  
Cod Removal ◽  
Optimum Operating ◽  
Oxidation Processes ◽  
Refinery Effluent ◽  
Petroleum Refinery Effluent

Objectives : This comparative study investigated various methods of advanced oxidation processes (AOPs) that were separately conducted for treating raw petroleum refinery effluent regarding chemical oxygen demand (COD) removal.Methods : Fenton, photo-Fenton, TiO2, ZnO, TiO2/Ultra violet (UV), and ZnO/UV were performed individually for measuring the effect of light irradiation, treatment time, pH, catalysts dosage, and light source on the profile of COD values.Results and Discussion : The experimental data of this work showed that the dependency on the light exposure in heterogeneous photo-catalytic reaction using TiO2 and ZnO is higher than that of homogeneous photo-Fenton technique. The optimum operating conditions in heterogeneous system occurred at 100 min of oxidation time, pH 5, and catalyst dosage 1 g/L that resulted in 21.8, 20.68, 60.9, and 55.17% of COD removal for TiO2, ZnO, TiO2/UV, and ZnO/UV, respectively. In contrast, both Fenton and photo-Fenton experienced their highest performance at pH 4 by obtaining 44.2 and 59.77% of COD removal, respectively. Eventually, kinetic study indicated that COD degradation can be well expressed by second-order pattern that reached higher correlation coefficient values by 0.999 and 0.998 for TiO2/UV and TiO2, respectively.Conclusions : Overall, it could be assumed that AOPs are reliable techniques to purify raw and complex raw industrial effluents.

scholarly journals Optimization of the Spent Activated Carbon Regeneration with the Radical Based Advanced Oxidation Processes: Preference of the Most Suitable Process by PROMETHEE Approach

2021 ◽  
Author(s):  
Nevim Genç ◽  
Elif Durna ◽  
Esin KACIRA
Keyword(s):  
Activated Carbon ◽  
Advanced Oxidation Processes ◽  
Operating Cost ◽  
Advanced Oxidation ◽  
Operating Conditions ◽  
Regeneration Process ◽  
Adsorptive Capacity ◽  
Optimum Conditions ◽  
Oxidation Processes ◽  
Regeneration Processes

Abstract In this study, regeneration of spent granular activated carbon (GAC) with reactive dye by hydroxyl and sulfate radical based advanced oxidation processes (Microwave (MW) + Persulfate (PS)), (Fe(II) + PS), and (O3 + H2O2) were evaluated. The adsorption of the dye to the GAC surface was characterized by chemisorption and Langmuir isotherm. Regeneration processes have been optimized by the Response Surface Methodology to determine the operating conditions that will provide the highest adsorptive capacity. The optimum conditions of (MW + PS), (Fe (II) + PS), and (O3 + H2O2) processes were (process PS anion of 45.52 g/L, pH of 11.4, MW power of 126 W, duration of 14.56 min), ( Fe (II) of 3.58 g/L, PS anion of 73.5 g/L, duration of 59.8 min, pH of 10.9) and (H2O2 of 2.8 mole/L, ozone dose of 98%, duration of 32.8 min, pH of 5.3), respectively. For (MW + PS), (Fe (II) + PS), and (O3 + H2O2) processes, the adsorptive capacity under optimum conditions were found as 4.36, 8.89 and 8.12 mg dye / g GAC respectively. For (Fe (II) + PS) and (O3 + H2O2) processes these values are approximately equal to the adsorptive capacity of raw GAC (8.01 mg dye / g GAC). The predicted values of the adsorption capacities by the obtained models were in good agreement with the actual experimental results. PROMETHEE approach was used in the preference of the appropriate regeneration process. The adsorptive capacity of regenerated GAC, operating cost of the regeneration process, change in the adsorptive capacity during the regeneration cycle and carbon mass loss criteria were taken into account. The order of preference of regeneration processes was determined as (Fe (II) + PS)> (MW + PS)> (O3 + H2O2) considering all criteria.

scholarly journals Bulk and Nanocatalysts Applications in Advanced Oxidation Processes

2020 ◽  
Author(s):  
Luma Majeed Ahmed
Keyword(s):  
Renewable Energy ◽  
Hydroxyl Radicals ◽  
Advanced Oxidation Processes ◽  
Uv Light ◽  
Advanced Oxidation ◽  
Oxidation Processes ◽  
Nano Catalyst ◽  
Bulk Catalyst ◽  
Metal Doped ◽  
Green Technique

Advanced oxidation processes (AOPs) are considered to be vital methods for treating the contaminations produced mainly by the human activations. In present-day, UV light or solar light, bulk and nano- photocatalysts are often used to enhance this technology by creating the highly reactive species such as the hydroxyl radicals. Extreme hydroxyl radical is considered as a key to start the photoreaction. Photoreaction is widely used in treatment of Lab and industrial contaminations, preparation of compounds and produced the renewable energy, so it’s classified as green technique. In order to improve the efficiency of this reaction with fabrication the surface of the used photocatalyst such as metal doped, sensitized and produced a composite as bulk catalyst or nano catalyst.

Use of selected advanced oxidation processes (AOPs) for wastewater treatment - a mini review

2013 ◽  
Vol 10 (3) ◽  
pp. 376-385 ◽  
Keyword(s):  
Hydrogen Peroxide ◽  
Wastewater Treatment ◽  
Advanced Oxidation Processes ◽  
Municipal Wastewater ◽  
Uv Light ◽  
Advanced Oxidation ◽  
Operating Parameters ◽  
Operational Cost ◽  
Initial Concentration ◽  
Oxidation Processes

Advanced oxidation processes (AOPs) are widely used for the removal of recalcitrant organic constituents from industrial and municipal wastewater. The aim of this study was to review the use of titanium dioxide/UV light process, hydrogen peroxide/UV light process and Fenton’s reactions in wastewater treatment. The main reactions and the operating parameters (initial concentration of the target compounds, amount of oxidation agents and catalysts, nature of the wastewater etc) affecting these processes are reported, while several recent applications to wastewater treatment are presented. The advantages and drawbacks of these methods are highlighted, while some of the future challenges (decrease of operational cost, adoption of strategies for processes integration) are discussed.

FOTODEGRADATION OF LOW MASS MOLECULE PAHS IN FENTON PROCESS

2017 ◽  
Vol 168 (48) ◽  
pp. 25-34 ◽  
Author(s):  
Jolanta Kozak ◽  
Maria Włodarczyk-Makuła
Keyword(s):  
Hydroxyl Radicals ◽  
Advanced Oxidation Processes ◽  
Uv Light ◽  
Advanced Oxidation ◽  
Alternative Source ◽  
Calcium Peroxide ◽  
Oxidation Processes ◽  
Low Mass ◽  
Alternative Sources ◽  
Oxidation Efficiency

Nowadays, the attention of many researchers and scientists is focused on wastewater treatment technologies which are designed to remove toxic and/or persistant compounds. PAHs belong to this type of compounds. Studies have shown that advanced oxidation processes (AOP-advanced oxidation processes) can be used for PAHs degradation. One of the AOP methods is oxidation using Fenton's reagent (Fe2 + / H2O2). The aim of this modification is a search for alternative sources of hydroxyl radicals than H2O2 and support that processes by UV light.. The aim of the study was to determine the efficiency of photocatalysis of low molecular weight PAHs in pretreated coking wastewater under Fenton reaction conditions. The source of hydroxyl radicals was calcium peroxide and the process was supported by UV radiation. The oxidation efficiency was assessed on the basis of PAH analyzes in the pre-and post-oxidation samples. Qualitative and quantitative identification of PAHs was carried out using gas chromatography in combination with GC-MS mass spectrometry. The decrease in the concentration of the analyzed carbohydrates was in the range of 17 to 96%. Studies have shown that calcium peroxide can be an alternative source of hydroxyl radicals for the PAH degradation present in coke wastwater.

Sign in / Sign up

Export Citation Format

Share Document