Use of Ozone and Hydrogen Peroxide to Remove Alachlor from Surface Water

1999 ◽  
Vol 63 (1) ◽  
pp. 9-14 ◽  
Author(s):  
F. Beltrán ◽  
B. Acedo ◽  
J. Rivas
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Water

scholarly journals Impacts of environmental levels of hydrogen peroxide and oxyanions on the redox activity of MnO2 particles

2021 ◽  
Author(s):  
Daqing Ja ◽  
Qinzhi Li ◽  
Tao Luo ◽  
Olivier Monfort ◽  
Gilles Mailhot ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Water ◽  
Redox Activity ◽  
Surface Water And Groundwater ◽  
Groundwater Systems ◽  
The Impact

Despite the widespread presence of hydrogen peroxide in surface water and groundwater systems, little is known about the impact of environmental levels of H2O2 on the redox activity of minerals....

Degradation Of Selected Herbicides In A Lowland Surface Water By Ozone And Ozone-Hydrogen Peroxide

1996 ◽  
Vol 18 (3) ◽  
pp. 251-269 ◽  
Author(s):  
Steven D. Lambert ◽  
Nigel J.D. Graham ◽  
Brian T. Croll
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Water

scholarly journals Effects of hydrogen peroxide preoxidation on clarification and reduction of the microbial load of groundwater and surface water sources for household treatment

2021 ◽  
Author(s):  
Kamila Jessie Sammarro Silva ◽  
Luan de Souza Leite ◽  
Natália de Melo Nasser Fava ◽  
Luiz Antonio Daniel ◽  
Lyda Patricia Sabogal-Paz
Keyword(s):  
Water Quality ◽  
Hydrogen Peroxide ◽  
Surface Water ◽  
Product Formation ◽  
Microbial Load ◽  
Waterborne Diseases ◽  
Household Water Treatment ◽  
Household Water ◽  
High Level ◽  
Source Water Quality

Abstract Household water treatment (HWT) technologies are a promising strategy for addressing the waterborne diseases burden. However, in order to be efficient, these are often limited to water quality and require it to not exceed a certain threshold of physicochemical and microbiological contamination. Additionally, some popular HWTs, as chlorination, are related to by-product formation. Preoxidation may improve source water quality, and hydrogen peroxide (H2O2) is an oxidant that has not been deeply explored in this specific application, so it could be an innovative approach to HWTs. We investigated effects of H2O2 preoxidation in two natural source waters (surface and groundwater), spiked with a high level of microorganisms. Clarification results suggested this pretreatment may improve life of HWTs. Reduction in microbial load of groundwater was considered ineffective, but 5-min H2O2 preoxidation at 15 mg L−1 led to >4.0 log10 inactivation of Phi X174 coliphage and >3.0 of Escherichia coli in surface water. We believe this performance was increased due to the presence of catalysts in the river water. This raised the point that water quality may be not only impairing, but potentially beneficial to the main HWT and characterization is crucial prior to the implementation of any technologies.

scholarly journals Evaluation of the impact of disinfection processes on the formation of biofilms in potable surface water distribution systems

1998 ◽  
Vol 38 (8-9) ◽  
pp. 283-289 ◽  
Author(s):  
Maggy N. B. Momba ◽  
T. E. Cloete ◽  
S. N. Venter ◽  
R. Kfir
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Water ◽  
Biofilm Formation ◽  
Distribution Systems ◽  
Water Distribution ◽  
Water Distribution Systems ◽  
Residual Effect ◽  
Viable Count ◽  
Significant Difference ◽  
The Impact

In this study, surface water was used to evaluate the impact of disinfection processes (chlorination, chloramination, ozonation, UV irradiation and hydrogen peroxide) on biofilm formation in potable water distribution systems. Biofilm formation was obvious, even in the presence of residual disinfectant concentrations (16.5 mgl−1 hydrogen peroxide, 1 mg−1 monochloramine, 0.2 mgl−1 free chlorine) within the first day after disinfection in the laboratory scale unit. The yield in viable count was higher on stainless steel coupons than on cement coupons within the first 8 days. Viable bacteria numbers on cement coupons were similar (±2 log cfu.cm−2) in chlorinated, ozonated and in the control. Biofilm formation was related to the depletion of residual disinfectant concentration. Monochloramine and hydrogen peroxide had a longer residual effect controlling growth of biofilm cells in the system for a longer period before regrowth occurred. Once no residual concentrations could be detected there was no significant difference between the viable bacterial counts on any of the coupons in the various systems.

scholarly journals Degradation of Neonicotinoids and Caffeine from Surface Water by Photolysis

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7277
Author(s):  
Alexandra Raschitor ◽  
Alberto Romero ◽  
Sandra Sanches ◽  
Vanessa J. Pereira ◽  
Joao G. Crespo ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Water ◽  
Electrical Energy ◽  
Radiation Absorption ◽  
Short Exposure ◽  
Preliminary Evaluation ◽  
Water Matrix ◽  
Indirect Photolysis ◽  
Electrical Energy Per Order ◽  
By Products

Along with rapid social development, the use of insecticides and caffeine-containing products increases, a trend that is also reflected in the composition of surface waters. This study is focused on the phototreatment of a surface water containing three neonicotinoids (imidacloprid, thiamethoxam, and clothianidin) and caffeine. Firstly, the radiation absorption of the target pollutants and the effect of the water matrix components were evaluated. It was observed that the maximum absorption peaks appear at wavelengths ranging from 246 to 274 nm, and that the water matrix did not affect the efficiency of the removal of the target pollutants. It was found that the insecticides were efficiently removed after a very short exposure to UV irradiation, while the addition of hydrogen peroxide was needed for an efficient caffeine depletion. The electrical energy per order was estimated, being the lowest energy required (9.5 kWh m−3 order−1) for the depletion of thiamethoxan by indirect photolysis, and a concentration of hydrogen peroxide of 5 mg dm−3. Finally, a preliminary evaluation on the formation of by-products reveals that these compounds play a key role in the evolution of the ecotoxicity of the samples, and that the application of direct photolysis reduces the concentration of these intermediates.

Formation of Chlorophenols and Related Compounds in Natural and Technical Chlorination Processes

1991 ◽  
Vol 24 (3-4) ◽  
pp. 403-410 ◽  
Author(s):  
Fredrik Hodin ◽  
Hans Borén ◽  
Anders Grimvall ◽  
Susanne Karlsson
Keyword(s):  
Hydrogen Peroxide ◽  
Surface Water ◽  
Organic Compounds ◽  
Low Ph ◽  
Active Chlorine ◽  
Halogenated Compounds ◽  
Organic Halogen ◽  
Halogenated Phenols ◽  
Natural Formation ◽  
Related Compounds

Surface water was halogenated by the addition of: (i) chloroperoxidase, hydrogen peroxide and chloride; (ii) hydrogen peroxide and chloride or bromide; (iii) hypochlorite. Analysis of adsorbable organic halogen (AOX), halogenated phenols and purgeable organic compounds showed that reactions (i) and (ii) produced almost the same halogenated compounds. It was also shown that active chlorine occurred as an intermedi-ate in reaction (i). Reaction (ii) implied a marked halogenation only after the addition of bromide, and this reaction was enhanced by a low pH. Existing evidence that 2,4,6-trichlorophenol may be naturally produced was strengthened. Some evidence was also obtained indicating that enzyme-mediated reactions may contribute to the natural formation of dibenzo-p-dioxins.

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