Study of ferrous iron oxidation in Morocco drinking water in an airlift reactor

Azher, N. El; Gourich, Bouchaib; Vial, Christophe; Soulami, M. Belhaj; Ziyad, M.

doi:10.1016/j.cep.2007.10.013

Cited by 40 publications

(12 citation statements)

References 32 publications

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“…The determination coefficient (0.8395) obtained by this analysis was higher than 0.7, indicating there is a significant relationship between the overall rate constant and pH. The slope (2.1701) of the plot fitting the data seems to match well with literature reports that the rate constant increases by two orders as pH increases by 1.0 unit (Sung and Morgan 1980;Azher et al 2008). In general, the kinetic constant is very dependent on ionic strength and dissolved counteranions, and decreases when ionic strength and anion concentration increase (Emmenegger et al 2008).…”

Section: Time (Hr)supporting

confidence: 81%

“…In a suspended solution containing Fe(III) minerals, the surface of Fe(III)(oxy)hydroxide minerals can act as a catalyst for Fe(II) oxidation (Azher et al 2008). In the heterogeneous oxidation of Fe(II), the soluble Fe(II) is adsorbed on the surface of Fe(III)(oxy)hydroxide minerals and the adsorbed Fe(II) is oxidized by an electron-transfer reaction enhanced by electron-poor sites on the surface (Sung and Morgan 1980;Park and Dempsey 2005).…”

Section: Evaluation Of Homogeneous and Heterogeneous Oxidationmentioning

confidence: 99%

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Pilot-scale tests to optimize the treatment of net-alkaline mine drainage

Jang¹,

Kwon²

2010

Environ Geochem Health

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A pilot-scale plant consisting of an oxidation basin (OB), a neutralization basin (NB), a reaction basin (RB), and a settling basin (SB) was designed and built to conduct pilot-scale experiments. With this system, the effects of aeration and pH on ferrous oxidation and on precipitation of the oxidized products were studied systemically. The results of pilot-scale tests showed that aeration at 300 L/min was optimum for oxidation of Fe(II) in the OB, and the efficiency of oxidation of Fe(II) increased linearly with increasing retention time. However, Fe(II) was still present in the subsequent basins-NB, RB, and SB. Results from pilot-scale tests in which neutralization was excluded were used to obtain rate constants for heterogeneous and homogeneous oxidation. Oxidation of Fe(II) reached almost 100% when the pH of the mine drainage was increased to more than 7.5, and there was a linear relationship between total rate constant, log (K(total)), and pH. Absorbance changes for samples from the NB under different pH conditions were measured to determine the precipitation properties of suspended solids in the SB. Because ferrous remained in the inflow to the SB, oxidation of Fe(II) was dominant initially, resulting in increased absorbance, and the rate of precipitation was slow. However, the absorbance of the suspension in the SB rapidly dropped when pH was higher than 7.5.

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Section: Time (Hr)supporting

confidence: 81%

Section: Evaluation Of Homogeneous and Heterogeneous Oxidationmentioning

confidence: 99%

Pilot-scale tests to optimize the treatment of net-alkaline mine drainage

Jang¹,

Kwon²

2010

Environ Geochem Health

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“…An acidic range of pH was also used ( Table 1). The acidic pH results in higher metal ion solubility (Azher et al, 2008).…”

Section: Resultsmentioning

confidence: 99%

Statistical evaluation of mature landfill leachate treatment by homogeneous catalytic ozonation

Peixoto

Filho

2010

Braz. J. Chem. Eng.

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“…This suggests that competition between the Mn 2+ species and radicals may also have occurred, since the solubility of ions is favored under acidic conditions. [ 24 ] On the other hand, Carvalho et al. [ 25 ] did not observe a catalytic effect when trying to remove organic matter from synthetic dairy wastewater using an O 3 /Mn 2+ system, whereas Wu et al., [ 21 ] in studying dye degradation, found higher reaction rates when the Mn 2+ dosage was increased.…”

Section: Resultsmentioning

confidence: 99%

Homogeneous Catalytic Ozonation of Lipids Involving Fe²⁺ and Mn²⁺: An Experimental and Modeling Study

Ramos

Biz

Tavares

et al. 2020

CLEAN Soil Air Water

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Given the issue of lipids in effluent treatment systems and their negative impact on the environment, this study aimed to examine lipid degradation by homogenous catalytic ozonation with the aid of iron and manganese ions. This technology presents the possibility of completely mineralizing pollutants using hydroxyl radicals. Milk is chosen as the lipid source because of the high concentration of triglycerides in its matrix, this kind of lipid being the one found most frequently in food and, consequently, in effluent treatment systems. The milk pH value is controlled, and acidic, neutral, and basic conditions are evaluated. The rates of pseudo-first-order reactions and the effective value are estimated. It is shown that under acidic conditions low catalyst dosages are enough to cause the complete degradation of lipids. Under neutral conditions, a similar behavior is observed. Under basic conditions, higher catalyst dosages give higher reaction rates. The order of effectiveness of the catalysts under acidic and basic conditions is Fe 2+ > Mn 2+ , with Mn 2+ > Fe 2+ under neutral conditions. Homogeneous catalytic ozonation is therefore efficient at lipid degradation. This technique is viable economically, since the lipid removal occurred at low ozone levels. In addition, the ions used as catalysts are naturally abundant.

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Study of ferrous iron oxidation in Morocco drinking water in an airlift reactor

Cited by 40 publications

References 32 publications

Pilot-scale tests to optimize the treatment of net-alkaline mine drainage

Pilot-scale tests to optimize the treatment of net-alkaline mine drainage

Statistical evaluation of mature landfill leachate treatment by homogeneous catalytic ozonation

Homogeneous Catalytic Ozonation of Lipids Involving Fe²⁺ and Mn²⁺: An Experimental and Modeling Study

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Study of ferrous iron oxidation in Morocco drinking water in an airlift reactor

Cited by 40 publications

References 32 publications

Pilot-scale tests to optimize the treatment of net-alkaline mine drainage

Pilot-scale tests to optimize the treatment of net-alkaline mine drainage

Statistical evaluation of mature landfill leachate treatment by homogeneous catalytic ozonation

Homogeneous Catalytic Ozonation of Lipids Involving Fe2+ and Mn2+: An Experimental and Modeling Study

Contact Info

Product

Resources

About

Homogeneous Catalytic Ozonation of Lipids Involving Fe²⁺ and Mn²⁺: An Experimental and Modeling Study