Optimization and Modeling of Photooxidative Process for the Degradation of Reactive Red223

2020 ◽  
Vol 42 (1) ◽  
pp. 42-42
Author(s):  
Abdul Rauf Shah Abdul Rauf Shah ◽  
Hajira Tahir and Tahira Yasmeen Hajira Tahir and Tahira Yasmeen
Keyword(s):  
Figure Of Merit ◽  
Irradiation Time ◽  
Electrical Energy ◽  
Order Kinetic ◽  
Operational Parameters ◽  
Contour Plots ◽  
Pseudo Second Order ◽  
Electrical Energy Per Order ◽  
The Cost ◽  
Central Composite

The optimization of the photooxidative process was carried out with the application of Response Surface Methodology (RSM) to degrade Reactive Red 223 (RR223) dye. Operational parameters of U.V/H2O2 process such as irradiation time, initial [dye], initial [H2O2] and distance between U.V lamp and the solution were optimized with Central Composite Design (CCD). Correlation coefficient value of the CCD was obtained to be 79 %, showing the correctness of the model and the successful utilization of CCD in getting desired levels of the factors of the process. Moreover, the optimum points were located with the graphical surface and contour plots. At the optimal conditions, the photooxidative removal of the color and COD were observed to be 68%, 81%, respectively. Furthermore, the pseudo-second order kinetic was guiding the removal of the dye in the process. Subsequently, the electrical energy consumption was estimated in term of the merit electrical energy per order (EEO). The figure of merit of the process was found to be 252 kWhm−3 order−1. The cost of the treatment was also calculated to be US$ 25/m3.

scholarly journals Application of central composite design for the optimization of photo-destruction of a textile dye using UV/S2O82- process

2009 ◽  
Vol 11 (4) ◽  
pp. 38-45 ◽  
Author(s):  
A. Khataee
Keyword(s):  
Reaction Time ◽  
Central Composite Design ◽  
Electrical Energy ◽  
Textile Dye ◽  
Operational Parameters ◽  
Destruction Efficiency ◽  
Uv Lamp ◽  
Electrical Energy Per Order ◽  
Experimental Values ◽  
Central Composite

Application of central composite design for the optimization of photo-destruction of a textile dye using UV/S2O82- process The photooxidative destruction of C. I. Basic Red 46 (BR46) by UV/S2O82- process is presented. Central Composite Design (CCD) was employed to optimize the effects of operational parameters on the photooxidative destruction efficiency. The variables investigated were the initial dye and S2O82- concentrations, reaction time and distance of the solution from UV lamp. The predicted values of the photodestruction efficiency were found to be in good agreement with the experimental values (R2 = 0.9810, Adjusted R2 = 0.9643). The results of the optimization predicted by the model showed that the maximum decolorization efficiency (>98%) was achieved at the optimum conditions of the reaction time 10 min, initial dye concentration 10 mg/l, initial peroxydisulfate concentration 1.5 mmol/l and distance of UV lamp from the solution 6 cm. The figure-of-merit electrical energy per order (EEo) was employed to estimate the electrical energy consumption and related treatment costs.

scholarly journals A Field Pilot Study on Treating Groundwater Contaminated with Sulfolane Using UV/H2O2

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1200 ◽  
Author(s):  
Linlong Yu ◽  
Sobhan Iranmanesh ◽  
Ian Keir ◽  
Gopal Achari
Keyword(s):  
Water Flow ◽  
Cost Model ◽  
Electrical Energy ◽  
Pilot Scale ◽  
Process Efficiency ◽  
Contaminated Groundwater ◽  
Operational Parameters ◽  
Flow Rates ◽  
Electrical Energy Per Order ◽  
H2o2 System

Sulfolane is an emerging contaminant in the groundwater and soil nearby gas plants, which has attracted much attention from many researchers and regulatory agencies in the past ten years. In this paper, a field pilot-scale ultraviolet (UV)/hydrogen peroxide (H2O2) system was investigated for treating sulfolane contaminated groundwater. Different groundwater, as well as different operational parameters such as influent sulfolane concentration, H2O2 dosage, and water flow rates, were studied. The results showed that a pilot-scale UV/H2O2 system can successfully treat sulfolane contaminated groundwater in the field, although the presence of iron and other groundwater limited the process efficiency. The lowest electrical energy per order of reduction for treating sulfolane in groundwater by using the pilot-scale UV/H2O2 system was 1.4 kWh m−3 order−1. The investigated sulfolane initial concentrations and the water flow rates did not impact the sulfolane degradation. The enhancement of sulfolane degradation in an open reservoir by adding ozone was not observed in this study. Furthermore, an operational cost model was formulated to optimize the dosage of H2O2, and a stepwise procedure was developed to determine the power necessary of the UV unit.

scholarly journals Statistical Optimization of Operational Parameters for Enhanced Naphthalene Degradation by Photocatalyst

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Aijuan Zhou ◽  
Jing Peng ◽  
Zhaobo Chen ◽  
Jingwen Du ◽  
Zechong Guo ◽  
...  
Keyword(s):  
Degradation Rate ◽  
Design Method ◽  
Irradiation Time ◽  
Catalyst Loading ◽  
Statistical Experimental Design ◽  
Optimal Conditions ◽  
Operational Parameters ◽  
Excellent Correlation ◽  
Naphthalene Degradation ◽  
Central Composite

The optimization of operational parameters for enhanced naphthalene degradation by TiO2/Fe3O4-SiO2(TFS) photocatalyst was conducted using statistical experimental design and analysis. Central composite design method of response surface methodology (RSM) was adopted to investigate the optimum value of the selected factors for achieving maximum naphthalene degradation. Experimental results showed that irradiation time, pH, and TFS photocatalyst loading had significant influence on naphthalene degradation and the maximum degradation rate of 97.39% was predicted when the operational parameters were irradiation time 97.1 min, pH 2.1, and catalyst loading 0.962 g/L, respectively. The results were further verified by repeated experiments under optimal conditions. The excellent correlation between predicted and measured values further confirmed the validity and practicability of this statistical optimum strategy.

scholarly journals Standard reporting of Electrical Energy per Order (EEO) for UV/H2O2 reactors (IUPAC Technical Report)

2018 ◽  
Vol 90 (9) ◽  
pp. 1487-1499 ◽  
Author(s):  
Olya Keen ◽  
James Bolton ◽  
Marta Litter ◽  
Keith Bircher ◽  
Thomas Oppenländer
Keyword(s):  
Organic Contaminants ◽  
Figure Of Merit ◽  
Advanced Oxidation Processes ◽  
Electrical Energy ◽  
Artificial Sweetener ◽  
Reactor Performance ◽  
Oxidation Processes ◽  
Technical Report ◽  
Order Of Magnitude ◽  
Electrical Energy Per Order

Abstract The concept of Electrical Energy per Order (EEO) was introduced in 2001 as a figure of merit for evaluating the energy requirements of ultraviolet-based advanced oxidation processes (UV AOPs) used for the degradation of various organic contaminants. The EEO parameter represents the energy input into the reactor that can achieve an order of magnitude decrease in the concentration of a target contaminant in a unit volume. Since the introduction of this parameter, it has become increasingly popular among UV AOP researchers and practitioners. However, the EEO is often reported without important details that affect the parameter, making its interpretation difficult. The EEO depends on a variety of factors (e.g. the concentration and identity of the target contaminant and the amount of hydrogen peroxide added). Therefore, the EEO parameter needs to be reported in the literature with several other experimental details affecting the reactor performance and in a way that proper comparisons can be made between reactors across studies or manufacturers. This paper discusses the proper application of the EEO parameter for bench-, pilot-, and full-scale studies. Sucralose (artificial sweetener, C12H19Cl3O8) is proposed as a standard substance for reactor comparison.

Comparison of advanced oxidation processes in flow-through pilot plants (Part II)

2001 ◽  
Vol 44 (5) ◽  
pp. 311-315 ◽  
Author(s):  
J.-P. Müller ◽  
C. Gottschalk ◽  
M. Jekel
Keyword(s):  
Energy Consumption ◽  
Figure Of Merit ◽  
Advanced Oxidation Processes ◽  
Advanced Oxidation ◽  
Electrical Energy ◽  
Batch Experiments ◽  
Oxidation Processes ◽  
Order Of Magnitude ◽  
Flow Through ◽  
Electrical Energy Per Order

The comparison of mechanistically different advanced oxidation processes (AOPS) UV/H2O2, UV/O3 and O3/H2O2 needs a non-specific figure-of-merit to avoid influences by system-inherent parameters. The chosen figure-of-merit consists of the electrical energy per order of magnitude in oxidation per m3, EE/O. Results from own experiments were compared with data derived from the literature. Considered were batch-experiments, pilot-plants and full-scale plants. The combination O3/H2O2 proved to be the most efficient process by means of energy consumption irrespective of the size of the plant.

scholarly journals Performance of Immobilized Chlorella Algae for Removing pb(II) Ions from Aqueous Solution

2019 ◽  
Vol 20 (3) ◽  
pp. 1-6
Author(s):  
Hala N. Abdulkareem ◽  
Abeer I. Alwared
Keyword(s):  
Second Order ◽  
Polluted Water ◽  
Order Kinetic ◽  
Operational Parameters ◽  
Algae Biomass ◽  
Adsorbent Surface ◽  
Before And After ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Chlorella Algae

This study aims to show the  effectiveness of immobilization of Chlorella green algae biomass in the form of bead for the removal of lead ions from synthetic polluted water  at various operational parameters such as pH (2–6), biosorbent dosage (0.5–20 g/L) and initial concentration (10–100 mg/L). More than 90 % removal efficiency was achieved. FTIR and SEM-EDX analysis of the biosorbent before and after sorption show differences in the functional groups on the adsorbent surface. Langmuir and Freundlich equilibrium isotherm, pseudo-first-order and pseudo-second-order kinetic models were applied to the experimental and results and show good conformity with Langmuir isotherm model and pseudo-second-order kinetic model with correlation coefficient (0.994) and (0.998) respectively.

scholarly journals Paracetamol degradation by photo-activated peroxydisulfate process (UV/PDS): kinetic study and optimization using central composite design

2020 ◽  
Vol 82 (7) ◽  
pp. 1404-1415 ◽  
Author(s):  
Karima Dibene ◽  
Idris Yahiaoui ◽  
Lamia Yahia Cherif ◽  
Salima Aitali ◽  
Abdeltif Amrane ◽  
...  
Keyword(s):  
Reaction Time ◽  
Central Composite Design ◽  
Degradation Rate ◽  
Degradation Efficiency ◽  
Order Kinetic ◽  
Optimal Conditions ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Central Composite ◽  
Optimal Ph

Abstract In this study, peroxydisulfate (PDS) was successfully activated by UV-irradiation for the degradation of paracetamol (PCT) frequently detected in the environment. Results showed that increasing the initial PDS concentration from 5 to 20 mM promote the removal of PCT from 49.3% to 97.5% after 240 min of reaction time. As the initial PCT concentration increased from 0.066 to 0.132 mM, the degradation efficiency of PCT decreased from 98% to 73% after 240 min of reaction time, while the optimal pH was found to be 6. It is apparent that the degradation rate of PCT was favored by the lamp power regardless of the initial PCT concentration, for 0.132 mM of PCT, the degradation efficiency increased from 73% to 95% when the lamp power increased from 9 to 30 W, respectively. The kinetic of degradation of the PCT was described by a pseudo-second order kinetic model. The model obtained by central composite design led to the following optimal conditions for PCT degradation: 0.132 mM initial PCT concentration, 20 mM PDS dose, pH solution 6 and lamp power 30 W led to the removal of 92% of PCT at 25 °C within 240 min of reaction time.

scholarly journals Optimization of Alachlor Photocatalytic Degradation with Nano-TiO2 in Water under Solar Illumination: Reaction Pathway and Mineralization

2018 ◽  
Vol 1 (1) ◽  
pp. 141-153 ◽  
Author(s):  
Md. Molla ◽  
Mai Furukawa ◽  
Ikki Tateishi ◽  
Hideyuki Katsumata ◽  
Satoshi Kaneco
Keyword(s):  
Photocatalytic Degradation ◽  
Reaction Pathway ◽  
Irradiation Time ◽  
Low Cost ◽  
Solar Irradiation ◽  
Order Kinetic ◽  
Operational Parameters ◽  
Sunlight Irradiation ◽  
Kinetics Of ◽  
Sunlight Intensity

In the present study, the photocatalytic degradation of alachlor was investigated using TiO2 under sunlight irradiation. The effects of some operational parameters, such as photocatalyst concentration, temperature, pH, sunlight intensity and irradiation time, were optimized. The kinetics of photodegradation was found to follow a pseudo-first-order kinetic law, and the rate constant at optimal condition is 0.245 min−1. The activation energy (Ea) is 6.4 kJ/mol. The alachlor mineralization can be completed under sunlight irradiation after 10 h. The formations of chloride, nitrate and ammonium ions are observed during the photocatalytic degradation. The eight photoproducts were identified by the GC–MS technique. The photodegradation reaction pathways are proposed based on the evidence of the detected photoproducts and the calculated frontier electron densities of the alachlor structure. The photocatalytic degradation treatment for the alachlor wastewater under solar irradiation is simple, convenient and low cost.

Comparison of advanced oxidation processes in flow-through pilot plants (Part I)

2001 ◽  
Vol 44 (5) ◽  
pp. 303-309 ◽  
Author(s):  
J.-P. Müller ◽  
M. Jekel
Keyword(s):  
Figure Of Merit ◽  
Advanced Oxidation Processes ◽  
Tap Water ◽  
Advanced Oxidation ◽  
Electrical Energy ◽  
Flow Reactors ◽  
Oxidation Processes ◽  
Order Of Magnitude ◽  
Continuous Flow Reactors ◽  
Electrical Energy Per Order

The advanced oxidation processes (AOPs) UV/H2O2, UV/O3 and O3/H2O2 were optimised to achieve a 90% degradation of the micropollutant atrazine in continuous-flow reactors. The experiments were performed with spiked Berlin tap-water. The comparison of mechanistically different oxidation systems needs a non-specific figure-of-merit to avoid influences by system-inherent parameters. The chosen figure-of-merit consists of the electrical energy per order of magnitude in oxidation per m3, EE/0. The combination O3/H2O2 proved to be the most efficient process by means of energy consumption.

scholarly journals Functionalized coconut husks for rhodamine-B dye sequestration

2019 ◽  
Vol 9 (8) ◽  
Author(s):  
Olugbenga Solomon Bello ◽  
Kayode Adesina Adegoke ◽  
Samuel Oluwaseun Fagbenro ◽  
Olasunkanmi Seun Lameed
Keyword(s):  
Rhodamine B ◽  
Dye Removal ◽  
Dye Adsorption ◽  
Isotherm Models ◽  
Acid Activation ◽  
Order Kinetic ◽  
Operational Parameters ◽  
Adsorption Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Abstract This study investigates the efficacy of acid activated coconut husk (CHA) for the removal of rhodamine-B (Rh-B) dye from aqueous solutions. The CHA prepared was characterized using various techniques: SEM, FTIR EDX, Boehm titration and pHpzc, respectively. The effects of different operational parameters including initial concentration, contact time and solution temperatures were examined. Kinetic data for Rh-B dye adsorption onto CHA fitted best to pseudo-second-order kinetic model considering the correlation regression (R2) and the sum of squares of error values. Adsorption data were fitted to Langmuir, Freundlich, Dubinin–Radushkevich and Temkin isotherm models. Langmuir isotherm was the most fitted among all the models used with maximum monolayer sorption capacity of 1666.67 mg g−1 and the highest regression value of 0.99 indicating that CHA has greater affinity for Rh-B dye adsorption due to increased pore development via acid activation. Thermodynamic studies revealed an endothermic adsorption process with the ΔH0 value of 62.77 kJ mol−1. Spontaneity was ascertained based on the negative values of ΔGo (ranging from − 26.38 kJ mol−1 to − 20.93 kJ mol−1). The positive value of ΔS0 (0.276 kJ mol−1 K−1) suggests increased randomness that exists between CHA and Rh-B dye. Cost analysis results revealed that CHA is six times cheaper than commercial activated carbon (CAC), providing a savings of 217 US$ kg−1. CHA adsorbent was found to be suitable for Rh-B dye removal from aqueous solution.

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