Application of the central composite design for condition optimization for semi-aerobic landfill leachate treatment using electrochemical oxidation

2010 ◽  
Vol 61 (5) ◽  
pp. 1257-1266 ◽  
Author(s):  
Soraya Mohajeri ◽  
Hamidi Abdul Aziz ◽  
Mohamed Hasnain Isa ◽  
Mohammad Ali Zahed ◽  
Mohammed J. K. Bashir ◽  
...  
Keyword(s):  
Reaction Time ◽  
Central Composite Design ◽  
Electrochemical Oxidation ◽  
Current Density ◽  
Landfill Leachate ◽  
Electrolyte Concentration ◽  
Process Conditions ◽  
Leachate Treatment ◽  
Condition Optimization ◽  
Central Composite

In the present study, Electrochemical Oxidation was used to remove COD and color from semi-aerobic landfill leachate collected from Pulau Burung Landfill Site (PBLS), Penang, Malaysia. Experiments were conducted in a batch laboratory-scale system in the presence of NaCl as electrolyte and aluminum electrodes. Central composite design (CCD) under Response surface methodology (RSM) was applied to optimize the electrochemical oxidation process conditions using chemical oxygen demand (COD) and color removals as responses, and the electrolyte concentrations, current density and reaction time as control factors. Analysis of variance (ANOVA) showed good coefficient of determination (R2) values of >0.98, thus ensuring satisfactory fitting of the second-order regression model with the experimental data. In un-optimized condition, maximum removals for COD (48.77%) and color (58.21%) were achieved at current density 80 mA/cm2, electrolyte concentration 3,000 mg/L and reaction time 240 min. While after optimization at current density 75 mA/cm2, electrolyte concentration 2,000 mg/L and reaction time 218 min a maximum of 49.33 and 59.24% removals were observed for COD and color respectively.

Landfill leachate treatment by electrocoagulation: Effects of current density and electrolysis time

2020 ◽  
Vol 8 (5) ◽  
pp. 104368
Author(s):  
Neanderson Galvão ◽  
Jeanette Beber de Souza ◽  
Carlos Magno de Sousa Vidal
Keyword(s):  
Current Density ◽  
Landfill Leachate ◽  
Electrolysis Time ◽  
Leachate Treatment

Optimization of Linoleic Acid Monoepoxidation Condition from Malaysian Jatropha curcas Using Central Composite Design (CCD)

2015 ◽  
Vol 754-755 ◽  
pp. 1107-1112
Author(s):  
Rozaini Abdullah ◽  
Jumat Salimon ◽  
Anis Atikah Ahmad
Keyword(s):  
Linoleic Acid ◽  
Reaction Time ◽  
Experimental Design ◽  
Central Composite Design ◽  
Reaction Temperature ◽  
Jatropha Curcas ◽  
Catalyst Loading ◽  
Time Saving ◽  
Independent Variable ◽  
Central Composite

The aim of this study was to optimize the monoepoxidation process of linoleic acid obtained from Malaysian Jatropha curcas oil using central composite design (CCD). There were four independent variable factors had been studied which involved reaction temperature (X1), reaction time (X2), catalyst loading (X3) and H2O2 concentration (X4). Thirty experiments were carried out based on the experimental design responses obtained. The results showed that the optimum condition was obtained at catalyst loading of 0.11% (w/w) methyltrioxorhernium (VII) (MTO), H2O2 mole of 99%, reaction temperature of 58.41oC for 5 hours. The central composite design was proven to be simpler method, time saving and required less samples compared to the conventional method.

The Application and Research of Electrochemical Method Treating Acid Red 3R Simulation Wastewater by Response Surface Method

2013 ◽  
Vol 295-298 ◽  
pp. 1258-1262
Author(s):  
Jun Sheng Hu ◽  
Lei Guan ◽  
Jia Li Dong ◽  
Ying Wang ◽  
Ying Yong Duan
Keyword(s):  
Response Surface ◽  
Electrochemical Oxidation ◽  
Current Density ◽  
Electrochemical Method ◽  
Electrolyte Concentration ◽  
Ph Value ◽  
Removal Rate ◽  
Oxidation Method ◽  
Surface Method ◽  
Optimal Value

Using electrochemical oxidation method treats the acid red 3R simulation wastewater, investigates the influence of current density, electrolyte concentration, pH-value and aeration and their interaction on the removal rate of chroma. Through the design of Box-Benhnken Design(BBD) and the response surface analysis, the influence sequence of all variables is current density > aeration > electrolyte concentration > pH-value, the influence sequence of all interaction is electrolyte concentration-aeration > current density-aeration ,electrolyte concentration-pH value > current density-pH value > pH value-aeration > current density-electrolyte concentration. Ultimately, the optimal value is 98.4915% under the condition of current density of 6.51mA/cm2,electrolyte concentration of 0.04mol/L,pH-value of 4.17 and aeration of 0.24m3/h.

scholarly journals Treatment of hazardous waste landfill leachate using Fenton oxidation process

2018 ◽  
Vol 34 ◽  
pp. 02034 ◽  
Author(s):  
Pradeep Kumar Singa ◽  
Mohamed Hasnain Isa ◽  
Yeek-Chia Ho ◽  
Jun-Wei Lim
Keyword(s):  
Reaction Time ◽  
Hazardous Waste ◽  
Landfill Leachate ◽  
Molar Ratio ◽  
Oh Radicals ◽  
Fenton Reagent ◽  
Leachate Treatment ◽  
Experimental Conditions ◽  
Waste Landfill ◽  
Hazardous Waste Landfill

The efficiency of Fenton’s oxidation was assessed in this study for hazardous waste landfill leachate treatment. The two major reagents, which are generally employed in Fenton’s process are H2O2 as oxidizing agent and Fe2+ as catalyst. Batch experiments were conducted to determine the effect of experimental conditions viz., reaction time, molar ratio, and Fenton reagent dosages, which are significant parameters that influence the degradation efficiencies of Fenton process were examined. It was found that under the favorable experimental conditions, maximum COD removal was 56.49%. The optimum experimental conditions were pH=3, H2O2/Fe2+ molar ratio = 3 and reaction time = 150 minutes. The optimal amount of hydrogen peroxide and iron were 0.12 mol/L and 0.04 mol/L respectively. High dosages of H2O2 and iron resulted in scavenging effects on OH• radicals and lowered degradation efficiency of organic compounds in the hazardous waste landfill leachate.

scholarly journals MODELING AND OPTIMIZATION FOR PRODUCTION OF STAINLESS STEEL CORROSION INHIBITORS FORMULATED WITH 1,3-DIPHENYL-3-PHENYLSULFANYL-PROPAN-1-ONE: A CLEAN PROCESS CATALYSED BY FLUORAPATITE

2017 ◽  
Vol 19 (4) ◽  
Author(s):  
ABROUKI YOUNES ◽  
ANOUZLA ABDELKADER ◽  
LOUKILI HAYAT ◽  
LOTFI RABIAÂ ◽  
RAYADH AHMED ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Reaction Time ◽  
Central Composite Design ◽  
Corrosion Inhibitor ◽  
Corrosion Inhibitors ◽  
Steel Corrosion ◽  
Environmental Problems ◽  
Ease Of Use ◽  
Modeling And Optimization ◽  
Central Composite

The optimization for process production of stainless steel corrosion inhibitor formulated with 1.3-Diphenyl-3-phenylsulfanyl-propan-1-one was studied using a 2 block central composite design including 3 factors (weight of catalyst, reaction time, and quantity of solvent). This process catalyzed by Fluorapatite coupled with their ease of use and reduced environmental problems makes them attractive alternatives to homogeneous basic reagents.

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