Chemical Treatment by Fenton’s Reagent Oxidation and Ozonation of Wastewaters from Olive Oil Mill

2008 ◽  
Vol 11 (3) ◽  
Author(s):  
Juan Garcia ◽  
Jesus Beltran-Heredia
Keyword(s):  
Chemical Oxygen Demand ◽  
Olive Oil ◽  
Flow Reactor ◽  
Oxygen Demand ◽  
Polyphenolic Compounds ◽  
Batch Reactors ◽  
Fenton’S Reagent ◽  
Reactor Model ◽  
Fenton's Reagent ◽  
Kinetic Rate Constants

AbstractIn this work olive oil mill wastewater has been treated as first step by means of a Fenton’s reagent process and later by an ozonation treatment, in batch reactors in both cases. In the Fenton’s reagent oxidation step, a reduction of 33% and 90% is obtained for chemical oxygen demand and total polyphenolic compounds, respectively. In the ozonation step, ozone partial pressure and temperature were varied leading to chemical oxygen demand removal in the range 5 - 17% and total polyphenolic compounds removal in the range 26 - 62%. A kinetic study, which consideres mixed flow reactor model for both phases, allows to determine the rate constant for the ozone reaction in the reduction of chemical oxygen demand and total polyphenolic compounds. Kinetic rate constants were correlated with temperature to Arrhenius equations.

Degradation of wine distillery wastewaters by the combination of aerobic biological treatment with chemical oxidation by Fenton's reagent

2005 ◽  
Vol 51 (1) ◽  
pp. 167-174 ◽  
Author(s):  
J. Beltran de Heredia ◽  
J. Torregrosa ◽  
J.R. Dominguez ◽  
E. Partido
Keyword(s):  
Chemical Oxygen Demand ◽  
Aromatic Compounds ◽  
Biological Treatment ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Chemical Oxidation ◽  
Utilization Rate ◽  
Fenton’S Reagent ◽  
Kinetic Rate Constant ◽  
Fenton's Reagent

The degradation of wine distillery wastewaters by aerobic biological treatment has been investigated in a batch reactor. The evolution of the chemical oxygen demand, biomass and total contents of polyphenolic and aromatic compounds was followed through each experiment. According to the Contois model, a kinetic expression for the substrate utilization rate is derived, and its biokinetic constant is evaluated. The final effluents of the aerobic biological experiments were oxidized by Fenton's reagent. The evolution of chemical oxygen demand, hydrogen peroxide concentration and total contents of polyphenolic and aromatic compounds was followed through each experiment. A kinetic model to interpret the experimental data is proposed. The kinetic rate constant of the global reaction is determined.

scholarly journals Improved sludge dewaterability and hydrolysis performance after pretreatment with Fenton's reagent

2017 ◽  
Vol 77 (1) ◽  
pp. 204-210 ◽  
Author(s):  
Hongying Yuan ◽  
Yuping Yang ◽  
Jian Yuan ◽  
Yanning Wang ◽  
Yameng Song ◽  
...  
Keyword(s):  
Volatile Fatty Acids ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Fenton’S Reagent ◽  
Excess Sludge ◽  
Reaction Conditions ◽  
Fenton's Reagent ◽  
Soluble Polysaccharide ◽  
Soluble Chemical Oxygen Demand ◽  
Sludge Dewaterability

Abstract The dewaterability of excess sludge significantly improved upon pretreatment with Fenton's reagent in this study. After 0.9 g/L of Fe2+ and 5.0 g/L of H2O2 were added to the sludge, and reacted for 2 h at pH = 4, the specific resistance to filtration (SRF) of the excess sludge decreased from an initial value of 29.74 × 1012 m/kg to 6.49 × 1012 m/kg. The factors that affected this improvement in sludge dewaterability as evaluated by SRF reduction showed the following order: H2O2 > pH > Fe2+ > reaction time. Furthermore, the hydrolysis performance of the sludge under the optimal reaction conditions was investigated. The results indicated that the concentration of soluble chemical oxygen demand in the supernatant increased almost 14 times compared to raw sludge, and the contents of soluble protein and soluble polysaccharide were more than 8 and 17 times higher, respectively, than for the untreated situation. However, the amounts of ammonia nitrogen (NH4+-N) and phosphate (PO43−-P) released from the sludge showed different trends: NH4+-N increased by 200%, while PO43−-P decreased by 82%. The production of volatile fatty acids (VFAs) from the treated sludge showed that total VFAs increased by 66%, and iso-butylacetic acid was the dominant product among the total VFAs.

scholarly journals Toxicity of coke wastewater treated with advanced oxidation by Fenton process supported by ultrasonic field

2016 ◽  
Vol 27 (1) ◽  
pp. 42-47 ◽  
Author(s):  
Anna Kwarciak-Kozłowska ◽  
Aleksandra Krzywicka
Keyword(s):  
Hydrogen Peroxide ◽  
Oxygen Demand ◽  
Advanced Oxidation ◽  
Inhibitory Effect ◽  
Ultrasonic Field ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Coke Wastewater ◽  
Similar Inhibitory Effect ◽  
Algae Growth Inhibition Test

AbstractThe aim of the presented study was to determine the toxicity of wastewater from the production of coke. The wastewater was treated with advanced oxidation involving ultrasonic field with Fenton’s reagent (the amplitude was 61.5 μm and sonication time 8 min). Two doses of iron and four doses of hydrogen peroxide were used. The amount of hydrogen peroxide was proportional to the value of the chemical oxygen demand of raw wastewater, ranging from COD/H2O2 ratio of 1:2.5 to 1:20. Two tests were used to determine the toxicity (algae growth inhibition test and Lepidium test). It was found that more toxic to algae was wastewater treated by Fenton’s reagent containing a higher dose of iron. A similar inhibitory effect was observed on the germination of cress seeds.

Treatment of synthetic kraft evaporator condensate using thermophilic and mesophilic membrane aerated biofilm reactors

2010 ◽  
Vol 61 (7) ◽  
pp. 1749-1756 ◽  
Author(s):  
B. Q. Liao ◽  
M. R. Zheng ◽  
L. Ratana-Rueangsri
Keyword(s):  
Comparative Study ◽  
Chemical Oxygen Demand ◽  
Removal Efficiency ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Biofilm Reactors ◽  
Cod Removal Efficiency

A comparative study on the treatment of synthetic kraft evaporator condensate was conducted using thermophilic (55°C) and mesophilic (30°C) membrane aerated biofilm reactors (MABRs) and sequencing batch reactors (SBRs) for 8 months. Under tested conditions, a chemical oxygen demand (COD) removal efficiency of 80–95% was achieved with both thermophilic and mesophilic MABRs and SBRs. The COD removal efficiency of thermophilic MABR (80–90%) was slightly lower than that of the mesophilic MABR (85–95%) and the thermophilic SBR (90–95%). A significant amount (13–37%) of COD was stripped by conventional aeration in the SBRs, while stripping in MABRs was negligible. Simultaneous COD removal and denitrification were observed in the mesophilic MABR, while the thermophilic MABR contributed mainly for COD removal. Nitrification was not significant in both the thermophilic and mesophilic MABRs. The results suggest that treatment of kraft evaporator condensate is feasible with the use of both thermophilic and mesophilic MABRs in terms of COD removal with the advantages of negligible stripping.

Treatment of Olive Oil Mill Wastewater by Fenton's Reagent

2001 ◽  
Vol 49 (4) ◽  
pp. 1873-1880 ◽  
Author(s):  
Francisco J. Rivas ◽  
Fernando J. Beltrán ◽  
Olga Gimeno ◽  
Jesus Frades
Keyword(s):  
Olive Oil ◽  
Fenton’S Reagent ◽  
Olive Oil Mill Wastewater ◽  
Fenton's Reagent
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