Destruction of Pollutants and Microorganisms in Water by UV Light and Hydrogen Peroxide

1992 ◽  
Vol 27 (1) ◽  
pp. 57-68 ◽  
Author(s):  
D.W. Sundstrom ◽  
B.A. Weir ◽  
T. A. Barber ◽  
H. E. Klei
Keyword(s):  
Hydrogen Peroxide ◽  
Organic Compounds ◽  
Chemical Structure ◽  
Uv Light ◽  
Liquid Films ◽  
Strong Interactions ◽  
Order Kinetic ◽  
E Coli ◽  
Order Kinetic Model ◽  
Catalyzed Oxidation

Abstract This project investigated the destruction of organic compounds and microorganisms in water by ultraviolet catalyzed oxidation using hydrogen peroxide as the oxidizing agent. The combination of UV light and hydrogen peroxide was effective in decomposing all of the organic compounds studied. The rates of destruction increased with increasing peroxide concentration and UV light intensity, and were highly dependent on chemical structure. The destruction of mixtures of organic compounds showed strong interactions between reacting components. The inactivation of E. coli and B. subtilis spores by UV light and/or hydrogen peroxide was studied in flat plate reactors. By using thin liquid films, the combination of UV light and peroxide greatly increased the rates of inactivation of both microorganisms. The results were correlated by a mixed second order kinetic model.

scholarly journals Heterogeneous Fenton-Like Oxidation of Methylene Blue Using Alternative Catalysts

2021 ◽  
Vol 29 (48) ◽  
pp. 91-97
Author(s):  
Juraj Michálek ◽  
Kseniya Domnina ◽  
Veronika Kvorková ◽  
Kristína Šefčovičová ◽  
Klaudia Mončeková ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Methylene Blue ◽  
Low Cost ◽  
Hydrogen Peroxide Solution ◽  
Blue Dye ◽  
Order Kinetic ◽  
Heterogeneous Fenton ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Black Nickel

Abstract The usage of the low-cost catalysts for methylene blue removal from wastewater was investigated. Heterogeneous Fenton-like process consists of the use of a hydrogen peroxide solution, and an iron-rich catalyst, red mud and black nickel mud were used for that purpose. The factors such as the catalyst dose and the hydrogen peroxide solution volume were monitored. The results of experiments showed that the degradation of methylene blue dye in Fenton-like oxidation process using selected catalysts can be described by a pseudo-second-order kinetic model. The highest dye removal efficiency (87.15 %) was achieved using the black nickel mud catalyst after 30 minutes of reaction.

Photocatalysed Oxidation of Toxic Organics

1987 ◽  
Vol 19 (3-4) ◽  
pp. 381-390 ◽  
Author(s):  
M. Brett Borup ◽  
E. Joe Middlebrooks
Keyword(s):  
Hydrogen Peroxide ◽  
Ultraviolet Radiation ◽  
Organic Compounds ◽  
Hydroxyl Radicals ◽  
Reaction Rate ◽  
Oxidation Process ◽  
Dimethyl Phthalate ◽  
First Order ◽  
Toxic Organics ◽  
Catalyzed Oxidation

The feasibility of treating water contaminated by two toxic organic compounds with an ultraviolet light catalyzed oxidation process using hydrogen peroxide as an oxidant is investigated. In this process hydrogen peroxide is decomposed by ultraviolet radiation producing hydroxyl radicals. The hydroxyl radicals will then oxidize organic compounds via a complex chain of radical reactions. Tests showed that this photooxidation process could successfully remove isophorone and dimethyl phthalate from contaminated waters. A reaction rate expression which adequately describes the process was developed. The reaction rate was found to be first order with respect to hydrogen peroxide concentration, zero order with respect to organic concentration and a function of ultraviolet radiation intensity. The reaction did not exhibit autocatalytic characteristics.

Ozone-based reclamation of an STP effluent

2011 ◽  
Vol 63 (10) ◽  
pp. 2123-2130 ◽  
Author(s):  
A. Rodríguez ◽  
R. Rosal ◽  
M. J. Gomez ◽  
E. García-Calvo ◽  
A. R. Fernandez-Alba
Keyword(s):  
Hydrogen Peroxide ◽  
Reference Data ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Gas Mixture ◽  
Order Kinetic ◽  
Secondary Clarifier ◽  
Order Kinetic Model ◽  
Wastewater Samples

The system ozone and hydrogen peroxide was used to reclaim wastewater from the secondary clarifier from a Sewage Treatment Plant (STP) of Alcalá de Henares (Madrid-Spain). The assays were performed by bubbling a gas mixture of oxygen and ozone, with ∼24 g Nm−3 of ozone concentration, through a volume of wastewater samples for 20 minutes at 25°C . The removal of dissolved micropollutants such as Pharmaceutical and Personal Care Products (PPCPs) and Organic Carbon (TOC) was enhanced by adding periodic pulses of hydrogen peroxide while keeping pH above 8.0 throughout the runs. Removal efficiency ratios in the range of 7–26 mg O3/mg TOC and 0.24 mg O3 /ng micropollutants at 5 minutes of ozonation were assessed as reference data to reclaim wastewater from STP. The relation between the extent of TOC removed and ozone doses used was related by a second-order kinetic model in which the time-integrated ozone-hydrogen peroxide concentration was included.

Destruction of trichloroethylene by UV light-catalyzed oxidation with hydrogen peroxide

Chemosphere ◽  
1993 ◽  
Vol 27 (7) ◽  
pp. 1279-1291 ◽  
Author(s):  
Barbara A. Weir ◽  
Donald W. Sundstrom
Keyword(s):  
Hydrogen Peroxide ◽  
Uv Light ◽  
Catalyzed Oxidation

scholarly journals Photodecolourization of congo red dye in presence of Ni3+ layered double hydroxide

2021 ◽  
Vol 30 ◽  
pp. 02010
Author(s):  
Irina Ryltsova ◽  
Evgenia Tarasenko ◽  
Olga Lebedeva
Keyword(s):  
Layered Double Hydroxide ◽  
Congo Red ◽  
Uv Light ◽  
Order Kinetic ◽  
X Ray ◽  
Congo Red Dye ◽  
Order Kinetic Model ◽  
Co Precipitation ◽  
Red Dye ◽  
Double Hydroxide

Layered double hydroxide containing Ni3+ (Mg/AlNi-LDH) was successfully synthesized by co-precipitation in an oxidizing media. The resulted product was characterized using X-ray diffraction, wavelength dispersive X-ray fluorescence spectrometry. The activity of Mg/AlNi-LDH in the process of photodegradation of Congo red dye using UV light irradiation was evaluated. The initial rate of photodegradation of the dye in the presence of LDH is 1.6 times higher than that of UV irradiated solution. The kinetic data obtained for photodegradation process can be adequately described by pseudo-first-order kinetic model. The presence of Mg/AlNi – LDH leads to increased photodegradation yield compared to destruction only by UV irradiation.

scholarly journals Removal of Sulfamethoxazole, Sulfathiazole and Sulfamethazine in their Mixed Solution by UV/H2O2 Process

2019 ◽  
Vol 16 (10) ◽  
pp. 1797 ◽  
Author(s):  
Guangcan Zhu ◽  
Qi Sun ◽  
Chuya Wang ◽  
Zhonglian Yang ◽  
Qi Xue
Keyword(s):  
Uv Light ◽  
Degradation Pathway ◽  
Photochemical Oxidation ◽  
Order Kinetic ◽  
Mixed Solution ◽  
Initial Concentration ◽  
Aqueous Environments ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Acidic Conditions

Sulfamethoxazole (SMZ), sulfathiazole (STZ) and sulfamethazine (SMT) are typical sulfonamides, which are widespread in aqueous environments and have aroused great concern in recent years. In this study, the photochemical oxidation of SMZ, STZ and SMT in their mixed solution using UV/H2O2 process was innovatively investigated. The result showed that the sulfonamides could be completely decomposed in the UV/H2O2 system, and each contaminant in the co-existence system fitted the pseudo-first-order kinetic model. The removal of sulfonamides was influenced by the initial concentration of the mixed solution, the intensity of UV light irradiation, the dosage of H2O2 and the initial pH of the solution. The increase of UV light intensity and H2O2 dosage substantially enhanced the decomposition efficiency, while a higher initial concentration of mixed solution heavily suppressed the decomposition rate. The decomposition of SMZ and SMT during the UV/H2O2 process was favorable under neutral and acidic conditions. Moreover, the generated intermediates of SMZ, STZ and SMT during the UV/H2O2 process were identified in depth, and a corresponding degradation pathway was proposed.

Catalytic Degradation of Pyrrole in Aqueous Solution by Cu/SBA-15

2015 ◽  
Vol 13 (3) ◽  
pp. 437-445 ◽  
Author(s):  
Shweta Garg ◽  
Vimal Chandra Srivastava ◽  
Seema Singh ◽  
Tapas Kumar Mandal
Keyword(s):  
Hydrogen Peroxide ◽  
Thermal Analyses ◽  
Stoichiometric Ratio ◽  
Order Kinetic ◽  
Optimum Conditions ◽  
Thermo Gravimetric ◽  
First Order ◽  
Operating Variables ◽  
Order Kinetic Model

Abstract Present study reports parametric and kinetic study for catalytic per oxidation (CPO) of pyrrole by Cu/SBA-15 catalyst using H2O2 as an oxidant. Brunauer-Emmett-Teller surface area, Fourier transform infra-red spectroscopy and thermo gravimetric-differential thermal analyses were used for the characterization of catalyst. Effects of various operating variables such as initial concentration of pyrrole (Co): 48.3–386.8 mg/L, catalytic dose (Cw): 0.5–2 g/L, stoichiometric ratio of hydrogen peroxide/pyrrole: 1–4, and reaction temperature (T): 50–60°C were studied. More than 85% pyrrole mineralization was observed at the optimum conditions of Cw = 1.5 g/L, stoichiometric ratio of hydrogen peroxide/pyrrole = 3, T = 55°C at pH = 6.1. A two-step pseudo-first-order kinetic model well-described the pyrrole mineralization by the CPO process.

scholarly journals Photodegradation Study of Toluidine Blue Dye in Aqueous Solution using Magnesium Oxide as a Photocatalyst

2015 ◽  
Vol 7 (2) ◽  
pp. 143 ◽  
Author(s):  
Haydar Mohammad Salim ◽  
Sabir Mohammad Salih
Keyword(s):  
Aqueous Solution ◽  
Magnesium Oxide ◽  
Toluidine Blue ◽  
Degradation Rate ◽  
Uv Light ◽  
Operating Conditions ◽  
Blue Dye ◽  
Order Kinetic ◽  
Order Kinetic Model ◽  
Toluidine Blue Dye

The photocatalytic degradation of Toluidine Blue dye (TB) in aqueous solution was investigated under UV light in the presence of magnesium oxide (MgO) as a photocatalyst at different operating parameters. The operating conditions were photocatalyst dose, initial dye concentration and the pH of the solution. Increasing of photocatalyst dose from 10 to 70 mg enhanced the degradation rate of TB dye. However, the increasing of TB dye concentration from 2 to 8 mg/L negatively affected the degradation rate. It was found that the percent of dye removal reached the maximum value at high acidic medium. In dark condition, 15 % of dye was adsorbed by MgO. Furthermore, the kinetics involved in the degradation of TB dye was examined and the degradation was found to follow pseudo first order kinetic model.

scholarly journals Comparison of indicator bacteria inactivation by the ultraviolet and the ultraviolet/hydrogen peroxide disinfection processes in humic waters

2011 ◽  
Vol 9 (4) ◽  
pp. 659-669 ◽  
Author(s):  
Arzu Teksoy ◽  
Ufuk Alkan ◽  
Sevil Çalışkan Eleren ◽  
Burcu Şengül Topaç ◽  
Fatma Olcay Topaç Şağban ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Fulvic Acid ◽  
Uv Radiation ◽  
Surface Waters ◽  
Uv Light ◽  
Indicator Bacteria ◽  
E Coli ◽  
Bacteria Inactivation ◽  
Potential Indicator ◽  
Test Organisms

The aim of the present study was to evaluate responses of potential indicator bacteria (i.e. Escherichia coli, Pseudomonas aeruginosa, Bacillus subtilis) to the ultraviolet (UV) radiation and the UV/hydrogen peroxide (H2O2) disinfection processes of surface waters with different qualities in terms of humic content. The UV and the UV/H2O2 processes were applied to waters containing various concentrations of fulvic acid in order to inactivate E. coli, P. aeruginosa and B. subtilis spores. Three fulvic acid (0, 2 and 6 mg l−1) and four H2O2 (0, 10, 25 and 50 mg l−1) concentrations were used. Results showed that the k values of E. coli, P. aeruginosa and B. subtilis spores varied between 2.22 and 4.00, 1.73 and 3.58, and 1.40 and 1.86, respectively, in all test conditions. The sensitivity of the test organisms followed a decreasing order of E. coli > P. aeruginosa > B. subtilis. Results of the study indicated that the blocking effect of fulvic acid for the UV light was diminished by using H2O2 in combination with the UV radiation. Findings of the present study strongly suggested that the UV/H2O2 process was significantly effective on the inactivation of E. coli and P. aeruginosa in humic waters, whereas it induced little or no apparent contribution to the disinfection efficiency of B. subtilis spores.

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