Impact of UV/H2O2 advanced oxidation treatment on molecular weight distribution of NOM and biostability of water

Bazri, Mohammad Mahdi; Barbeau, Benoît; Mohseni, Madjid

doi:10.1016/j.watres.2012.07.017

Cited by 64 publications

(25 citation statements)

References 34 publications

(42 reference statements)

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“…The correlation between the MW and the retention time was calibrated using polystyrene sulfonic acid sodium standards. To quantify the changes in the MW distribution, the chromatograms were deconvoluted into a number of Gaussian peaks using PeakFit v4.12 software with similar settings presented by Bazri et al (2012).…”

Section: Molecular Weight Distribution Analysis Of Organic Mattermentioning

confidence: 99%

Characterization of microflora and transformation of organic matters in urban sewer system

et al. 2015

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Section: Molecular Weight Distribution Analysis Of Organic Mattermentioning

confidence: 99%

Characterization of microflora and transformation of organic matters in urban sewer system

et al. 2015

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“…Maximum TOC removal was achieved at the lowest initial TOC concentration of 4 mg/L. Generally, UV radiation and hydrogen peroxide produces free radicals such as hydroxyl radicals [1,26,27]. Increasing in initial concentration of humic substances generally decreases the process efficiency, probably because of competition between metabolites of humic substances to react with the hydroxyl radicals as a non-selective agent.…”

Section: Resultsmentioning

confidence: 99%

“…NOM can also compete with H 2 O 2 for reacting with UV radiation. Thus, low concentrations of NOMs allow more H 2 O 2 photolysis and consequently more hydroxyl radicals production [26]. As it is shown in Figure 3a and d, TOC removal efficiency increased with increasing H 2 O 2 concentration.…”

Section: Resultsmentioning

confidence: 99%

Application of response surface methodology for optimization of natural organic matter degradation by UV/H2O2 advanced oxidation process

Rezaee

Maleki

Jafari

et al. 2014

J Environ Health Sci Engineer

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BackgroundIn this research, the removal of natural organic matter from aqueous solutions using advanced oxidation processes (UV/H2O2) was evaluated. Therefore, the response surface methodology and Box-Behnken design matrix were employed to design the experiments and to determine the optimal conditions. The effects of various parameters such as initial concentration of H2O2 (100–180 mg/L), pH (3–11), time (10–30 min) and initial total organic carbon (TOC) concentration (4–10 mg/L) were studied.ResultsAnalysis of variance (ANOVA), revealed a good agreement between experimental data and proposed quadratic polynomial model (R2 = 0.98). Experimental results showed that with increasing H2O2 concentration, time and decreasing in initial TOC concentration, TOC removal efficiency was increased. Neutral and nearly acidic pH values also improved the TOC removal. Accordingly, the TOC removal efficiency of 78.02% in terms of the independent variables including H2O2 concentration (100 mg/L), pH (6.12), time (22.42 min) and initial TOC concentration (4 mg/L) were optimized. Further confirmation tests under optimal conditions showed a 76.50% of TOC removal and confirmed that the model is accordance with the experiments. In addition TOC removal for natural water based on response surface methodology optimum condition was 62.15%.ConclusionsThis study showed that response surface methodology based on Box-Behnken method is a useful tool for optimizing the operating parameters for TOC removal using UV/H2O2 process.

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“…60 to 90 percent of natural organic matter (NOM) is humic substances (Mansoori et al, 2014). So far, various processes have been used to remove of humic substances such as UV-H2O2 (Bazri et al, 2012), Fenton process (Wu et al, 2011), ozonation (Yavich et al, 2004), ion exchange and PAC (Humbert et al, 2008), coagulation (Matilainen et al, 2010), membrane filtration (Cui and Choo, 2014), adsorption-photodegradation (Wang et al, 2013). Of these processes, adsorption processes are more preferable.…”

Section: Introductionmentioning

confidence: 99%

Performance of granular activated carbon/nanoscale zero valent iron for removal of humic substances from aqueous solution based on Experimental Design and Response Surface Modeling

Yazdanbakhsh¹,

Hashempour²,

Ghaderpouri³

2017

Global NEST Journal

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Graphic Abstract AbstractResponse surface methodology has been used to design experiments and to optimize the effect of independent variables responsible for higher adsorption of humic substances by activated carbon supported nanoscale zerovalent iron from aqueous solutions. The variables of initial concentration, time, pH, adsorbent dose was examined. The characterization of NZVI/AC was carried out by SEM-EDS and XRD analysis. The adsorption isotherms and kinetics of humic substances on AC and NZVI/AC were studied. The findings showed that the particle size of synthesis NZVI were in the range 20-50nm. The experimental data followed the Langmuir isotherm and pseudo-second kinetic model. For AC, optimum conditions of initial concentration, pH, contact time, and adsorbent dose were 5 mg L , respectively. Predicted removal efficiency by Box-Benken models for activated carbon and NZVI were 60 and 100 percent, respectively.

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Impact of UV/H2O2 advanced oxidation treatment on molecular weight distribution of NOM and biostability of water

Cited by 64 publications

References 34 publications

Characterization of microflora and transformation of organic matters in urban sewer system

Characterization of microflora and transformation of organic matters in urban sewer system

Application of response surface methodology for optimization of natural organic matter degradation by UV/H2O2 advanced oxidation process

Performance of granular activated carbon/nanoscale zero valent iron for removal of humic substances from aqueous solution based on Experimental Design and Response Surface Modeling

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