Winery wastewater treatment by a combined process: long term aerated storage and Fenton's reagent

2009 ◽  
Vol 60 (4) ◽  
pp. 1089-1095 ◽  
Author(s):  
Marco S. Lucas ◽  
Maria Mouta ◽  
António Pirra ◽  
José A. Peres
Keyword(s):  
Oxidation Process ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Chemical Oxidation ◽  
Molar Ratio ◽  
Fenton’S Reagent ◽  
Mass Ratio ◽  
Fenton's Reagent ◽  
Winery Wastewater

The degradation of the organic pollutants present in winery wastewater was carried out by the combination of two successive steps: an aerobic biological process followed by a chemical oxidation process using Fenton's reagent. The main goal of this study was to evaluate the temporal characteristics of solids and chemical oxygen demand (COD) present in winery wastewater in a long term aerated storage bioreactor. The performance of different air dosage daily supplied to the biologic reactor, in laboratory and pilot scale, were examined. The long term hydraulic retention time, 11 weeks, contributed remarkably to the reduction of COD (about 90%) and the combination with the Fenton's reagent led to a high overall COD reduction that reached 99.5% when the mass ratio (R = H2O2/COD) used was equal to 2.5, maintaining constant the molar ratio H2O2/Fe2 + =15.

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.

Study on Preparation and Properties of β-NiOOH

2011 ◽  
Vol 239-242 ◽  
pp. 646-649 ◽  
Author(s):  
Hui Min Gu ◽  
Wei Wang ◽  
Yu Chun Zhai
Keyword(s):  
Crystal Structure ◽  
Reaction Time ◽  
Oxidation Process ◽  
Specific Capacity ◽  
Decomposition Reaction ◽  
Chemical Oxidation ◽  
Raw Material ◽  
Mass Ratio ◽  
Nickel Zinc ◽  
Dta Analysis

Taking β-Ni(OH)2 powder as raw material and K2S2O8 as oxidant, β-NiOOH was prepared through chemical oxidation process, then which was used as cathode material to assemble nickel-zinc cell. Effects of reaction time, reaction temperature, NaOH concentration, Ni(OH)2 concentration and mass ratio of K2S2O8 and Ni(OH) 2 on 1st discharge specific capacity of cells were studied. XRD result indicates that the crystal structure of β-NiOOH is disordered in a way. TG-DTA analysis indicates that the decomposition reaction of β-NiOOH occurs at temperature of 156-280 °C, the end product is NiO.

Rapid Disposal of Pentachlorophenol Contaminated Soils in a Soil Reactor

2012 ◽  
Vol 518-523 ◽  
pp. 2695-2703
Author(s):  
Yu Tao ◽  
Ai Jun Wang ◽  
Li Juan Wang ◽  
Guang Min Liu ◽  
Hong Qi
Keyword(s):  
Contaminated Soils ◽  
Operating Conditions ◽  
Toxic Chemicals ◽  
Molar Ratio ◽  
Optimum Operating ◽  
Fenton’S Reagent ◽  
Practical Application ◽  
Oxidative Potential ◽  
Fenton's Reagent ◽  
Rotating Speed

At present the point source soil contaminations by toxic chemicals are very serious, and many methods are used for the rapid disposal. In recent years, Fenton’s reagent has been paid more and more attention because of its high oxidative potential and simplicity. In this work, pentachlorophenol (PCP) was used to simulate contaminated soils, and a tilted soil reactor was designed to study its decomposition by Fenton’s reagent. The effects of six variables on PCP degradation were evaluated: (1) initial soil-water ratio; (2) reaction time; (3) H2O2-Fe2+ molar ratio; (4) dosing method; (5) reaction tank rotating speed and (6) initial H2O2 concentration, and the optimum operating conditions were identified. However, further research is required for practical application.

Kinetic Study of Advanced Oxidation of Eosin Dye by Fenton's Reagent

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Phalguni Banerjee ◽  
Sunando DasGupta ◽  
Sirshendu De
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Sulfate ◽  
Advanced Oxidation Process ◽  
Oxidation Process ◽  
Advanced Oxidation ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Oxidation Study ◽  
Dye Decomposition ◽  
Detailed Kinetic Model

An advanced oxidation study using Fenton's reagent, i.e., ferrous sulfate and hydrogen peroxide was carried out for studying oxidation of eosin dye. Effects of concentration of various reagents on the degradation of dye were explored during an advanced oxidation process. It was found that ferrous concentration plays a major role in dye decomposition. Rate of dye decomposition is faster with an increase in ferrous sulfate concentration compared to the increase in hydrogen peroxide concentration. A detailed kinetic model was proposed. Profiles for eosin, hydrogen peroxide and various intermediates were also generated. The rate constant of the reaction of eosin with a hydroxyl radical was found to be of the order of 109 l/mol.s.

scholarly journals Chemical oxidation of fish canning wastewater by Fenton's reagent

2014 ◽  
Vol 2 (4) ◽  
pp. 2372-2376 ◽  
Author(s):  
Raquel O. Cristóvão ◽  
Cristiana Gonçalves ◽  
Cidália M. Botelho ◽  
Ramiro J.E. Martins ◽  
Rui A.R. Boaventura
Keyword(s):  
Chemical Oxidation ◽  
Fenton’S Reagent ◽  
Fenton's Reagent

Winery wastewater treatment by combination of Cryptococcus laurentii and Fenton’s reagent

Chemosphere ◽  
2014 ◽  
Vol 117 ◽  
pp. 53-58 ◽  
Author(s):  
Cátia Santos ◽  
Marco S. Lucas ◽  
Albino A. Dias ◽  
Rui M.F. Bezerra ◽  
José A. Peres ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Cryptococcus Laurentii ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Winery Wastewater

Chemical destruction of MTBE using Fenton's Reagent: effect of ferrous iron/hydrogen peroxide ratio

2003 ◽  
Vol 47 (9) ◽  
pp. 165-171 ◽  
Author(s):  
A. Burbano ◽  
D. Dionysiou ◽  
M. Suidan ◽  
T. Richardson
Keyword(s):  
Hydrogen Peroxide ◽  
Ferrous Iron ◽  
Degradation Process ◽  
Methyl Tert Butyl Ether ◽  
Molar Ratio ◽  
Limiting Factor ◽  
Fenton’S Reagent ◽  
Butyl Ether ◽  
Fenton's Reagent ◽  
Mtbe Degradation

In previous laboratory experiments Fenton's Reagent (FR) was successfully used as the source of hydroxyl radicals (OH•) for chemical treatment of low concentrations of methyl tert-butyl ether (MTBE) in water. Although under certain conditions MTBE degradation levels as high as 99.99% were achieved, none of these experiments resulted in complete MTBE mineralization. In all cases, these experiments applied FR as an equimolar concentration of ferrous iron (Fe2+) and hydrogen peroxide (H2O2). The present study investigates the effect of H2O2/Fe2+ molar ratio on the extent of degradation of MTBE and intermediate products in water at pH = 3.0. The initial concentration of MTBE studied was 0.0227 mM (approximately 2 mg/L). Initially, the dose of Fe2+ was kept constant at a Fe2+/MTBE molar ratio of 10:1 and the dose of H2O2 was varied to achieve different H2O2/Fe2+ molar ratios. The results revealed that higher degradation efficiency was achieved when FR was used as an equimolar mixture (H2O2/Fe2+ molar ratio = 1.0). The extent of MTBE degradation decreased when the H2O2/Fe2+ molar ratio was changed to values higher or lower than 1.0. These results suggest that a stoichiometric relationship (1:1) between the FR components optimizes the degradation process for this reactant system. It is hypothesized that an excess of H2O2 enhances the effect of reactions that scavenge OH•, while a decreased amount of H2O2 would be a limiting factor for the Fenton Reaction.

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