scholarly journals Application of the eco-friendly subcritical water oxidation method in the degradation of epichlorohydrin

2019 ◽  
Vol 84 (7) ◽  
pp. 757-767 ◽  
Author(s):  
Erdal Yabalak ◽  
İpek Topaloğlu ◽  
Ahmet Gizir
Keyword(s):  
Hydrogen Peroxide ◽  
Water Oxidation ◽  
Treatment Time ◽  
Subcritical Water ◽  
P Value ◽  
Oxidation Method ◽  
Toc Removal ◽  
Oxidant Concentration ◽  
Experimental Process ◽  
Central Composite

Degradation of epichlorohydrin was investigated using subcritical water oxidation method in the presence of hydrogen peroxide. Degradation rate was monitored by means of total organic carbon (TOC) analysis. The central composite design was used to determine optimal TOC removal conditions and modelling experimental process. The effects of all experimental variables (temperature, oxidant concentration of hydrogen peroxide and treatment time) on the TOC removal rates were evaluated and the theoretical prediction model was proposed. Reliability of the employed model was evaluated using ANOVA. F value and the p-value of the model were found to be 84.60 and <0.0001, respectively. 93.78 % of TOC removal was achieved in the degradation of epichlorohydrin at 373 K of temperature and 75 min of treatment time using 90 mM of H2O2.

scholarly journals Degradation, dephenolisation and dearomatisation of olive mill wastewater by subcritical water oxidation method using hydrogen peroxide: Application of multi-response central composite design

2018 ◽  
Vol 83 (4) ◽  
pp. 489-502 ◽  
Author(s):  
Erdal Yabalak ◽  
Özkan Görmez ◽  
Belgin Sönmez
Keyword(s):  
Central Composite Design ◽  
Water Oxidation ◽  
Treatment Time ◽  
Subcritical Water ◽  
Oxygen Demand ◽  
Temperature Treatment ◽  
Olive Mill Wastewater ◽  
Oxidation Method ◽  
Central Composite ◽  
Olive Mill

An environmentally friendly method to decontaminate the olive mill wastewater, which is encountered as a major environmental problem is presented in this study. The removal of both polyphenolic and aromatic content and the degradation of wastewater of olive mill supplied from Mersin/Turkey region were investigated by the subcritical water oxidation method using H2O2. The central composite design of response surface methodology was used to assess the effects of temperature, treatment time, and the concentration of oxidising agent. The reliability of the employed method was proved by ANOVA. The optimum experimental parameters were determined and theoretical equations were proposed in each case. The highest chemical oxygen demand removal, dephenolisation and dearomatisation values were obtained as 85.74, 96.13 and 95.94 %, respectively.

scholarly journals Modelling and optimisation of oxidative desulphurisation of tyre-derived oil via central composite design approach

2019 ◽  
Vol 8 (1) ◽  
pp. 451-463 ◽  
Author(s):  
Peter Tumwet Cherop ◽  
Sammy Lewis Kiambi ◽  
Paul Musonge
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Formic Acid ◽  
Central Composite Design ◽  
Coefficient Of Determination ◽  
P Value ◽  
Before And After ◽  
Cubic Model ◽  
Central Composite ◽  
Sulphur Removal

Abstract The aim of this study was to apply the central composite design technique to study the interaction of the amount of formic acid (6-12 mL), amount of hydrogen peroxide (6-10 mL), temperature (54-58°C) and reaction time (40-60 min) during the oxidative desulphurisation (ODS) of tyre-derived oil (TDO). The TDO was oxidised at various parametric interactions before being subjected to solvent extraction using acetonitrile. The acetonitrile to oil ratios used during the extraction were 1:1 and 1:2. The content of sulphur before and after desulphurisation was analysed using ICP-AES. The maximum sulphur removal achieved using a 1:1 acetonitrile to oxidised oil ratio was 86.05%, and this was achieved at formic acid amount, hydrogen peroxide amount, temperature and a reaction time of 9 mL, 8 mL, 54°C and 50 min respectively. Analysis of variance (ANOVA) indicated that the reduced cubic model could best predict the sulphur removal for the ODS process. Coefficient of determination (R2 = 0.9776), adjusted R2 = 0.9254, predicted R2 = 0.8356 all indicated that the model was significant. In addition, the p-value of lack of fit (LOF) was 0.8926, an indication of its insignificance relative to pure error.

scholarly journals Synergistic bromothymol blue dye degradation with hydrodynamic cavitation and hydrogen peroxide (HC-H2O2)

2020 ◽  
Vol 15 (3) ◽  
pp. 1
Author(s):  
Polyane Ribeiro Machado ◽  
Thiago Vinícius Ribeiro Soeira ◽  
Fausto De Souza Pagan ◽  
Geoffroy Roger Pointer Malpass ◽  
Julio Cesar de Souza Inácio Gonçalves ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Treatment Time ◽  
Dye Degradation ◽  
Oxygen Demand ◽  
Bromothymol Blue ◽  
Hydrodynamic Cavitation ◽  
Molar Ratio ◽  
Blue Dye ◽  
Before And After ◽  
Central Composite

This study assessed the degradation of bromothymol blue in a Venturi device based on a hybrid process that combines hydrodynamic cavitation (HC) and hydrogen peroxide (H2O2). A Rotatable Central Composite Design (RCCD) was used to optimize the following variables: pressure, reaction time and molar ratio of hydrogen peroxide. Degradation efficiencies were evaluated based on Chemical Oxygen Demand (COD) and color removals before and after Venturi treatment. Maximum COD (93.42%) and color (93.28%) removals were observed at 4.0 bar inlet pressure, at a treatment time of 25 minutes and at H2O2/effluent (dye) molar ratio of 30:1. The hydrodynamic cavitation/hydrogen peroxide system has great potential to remove normally recalcitrant organic pollutants.

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