Advanced Oxidation Processes: Applications in Drinking Water Treatment

Linden, Karl G.; Mohseni, Madjid

doi:10.1016/b978-0-12-382182-9.00031-1

Cited by 43 publications

(34 citation statements)

References 135 publications

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“…The simultaneous photocatalytic oxidation of multi-chlorinated phenols has not been researched comprehensively, and the few studies that have been conducted suggest that the chemical oxidation processes involve various complex steps. Different advanced oxidation process techniques utilise different method-specific mechanisms to achieve the degradation process [9][10]. Oxidation dehalogenation of chloride-substituted phenols has been the focus of numerous studies, included are those by Higashimoto et al [11], Minero et al [12] and Elsellami et al [13], these investigated the oxidation mechanisms of 4-chlorophenol and 2.4-dichlorophenol.…”

Section: Introductionmentioning

confidence: 99%

Modelling and simulation of photocatalytic oxidation mechanism of chlorohalogenated substituted phenols in batch systems: Langmuir–Hinshelwood approach

Khuzwayo

Chirwa

2015

Journal of Hazardous Materials

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This study investigated, modelled and simulated the influence of multi-chlorohalogenation in heterogeneous photocatalytic degradation of substituted phenols (pentachlorophenol (PCP), trichlorophenol (TCP), dichlorophenol (DCP), and monochlorophenol (CP)). The LangmuirHinshelwood approach was applied to determine oxidation kinetics. Aquasim 2.0 computational software was used to model, simulate and estimate model parameters of the different chlorophenols. Chemical adsorption equilibrium isotherms for the four chlorophenols and phenol were studied and modelled for adsorption onto titanium dioxide (TiO 2 ) semiconductor catalyst. Langmuir adsorption parameters were determined and used to calculate adsorption constant and maximum adsorption capacity. The adsorption of chloride phenolics onto titanium dioxide catalyst increased in the order of 4-CP < DCP < Ph < TCP < PCP. Photocatalytic studies analysed the efficiency of oxidation and found improved degradation with higher chloride substituted phenolics in the order of PCP > TCP > DCP ≥ 4-CP. Photocatalytic parameters were calculated and estimated along with sensitivity and uncertainty analyses.

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Section: Introductionmentioning

confidence: 99%

Modelling and simulation of photocatalytic oxidation mechanism of chlorohalogenated substituted phenols in batch systems: Langmuir–Hinshelwood approach

Khuzwayo

Chirwa

2015

Journal of Hazardous Materials

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“…Group 1 : 1984-1991Group 2: 1992-1996Group 3: 1997-2006Group 4: 2007-2014 The mean manganese concentrations declined over time (Fig. 2).…”

Section: Resultsmentioning

confidence: 99%

“…Advanced oxidation processes (AOPs) in drinking water are used to degrade primarily organic chemical contaminants, e.g., taste-and odour-causing compounds (Linden and Mohseni, 2014). Ozone and ultraviolet (UV) light constitute the main AOPs and are increasingly being used at a large scale for the degradation of contaminants in water and wastewater (Linden and Mohseni, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…Ozone and ultraviolet (UV) light constitute the main AOPs and are increasingly being used at a large scale for the degradation of contaminants in water and wastewater (Linden and Mohseni, 2014). Wang et al (2015) compared UV/chlorine to UV/hydrogen peroxide (H 2 O 2 ) at various pH concentrations, as UV/H 2 O 2 is becoming more popular.…”

Section: Discussionmentioning

confidence: 99%

“…The colour removal also showed limited success. Ozone clearly proved to be more effective and the decision was made to terminate pre-chlorination and utilise pre-ozonation only, as from 1992-1997 (Krüger et al, 2006).…”

Section: Figure 2 Box and Whisker Plots That Compare Means Standard mentioning

confidence: 99%

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Challenges in the potable water industry due to changes in source water quality: case study of Midvaal Water Company, South Africa

Rensburg¹,

Barnard²,

Krüger³

2016

WSA

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Midvaal Water Company treats hypertrophic water abstracted from the Vaal River to supply bulk wholesome potable water to their consumers in compliance with the South African National Standard (SANS) 241:2015 for drinking water. The facility incorporates conventional and advanced treatment processes. The aims of the study were to identify how the water treatment processes of the plant have changed over time in response to the varying water quality of the Vaal River, and to consider both current and future obstacles as well as possible solutions regarding water quality and treatment. Oxidation steps such as pre-chlorination, potassium permanganate addition, pre-ozonation and intermediate ozonation have either been applied in the past or are still operational. The dissolved air flotation plant accounts for almost 70% of total chlorophyll removal and the significance of this process was confirmed during a brief maintenance shutdown during 2015. Total chlorophyll concentrations of the source water have increased extensively since 1984, while turbidity levels have remained fairly constant but with spikes at times. The facility suffers from severe taste and odour episodes during warm periods due to the presence of methylisoborneol (MIB), released by Cyanophyceae, in the Vaal River. Concentrations of > 300 ng/L MIB have been recorded, whereas the odour threshold concentration for MIB ranges from 4 ng/L to 20 ng/L. The additional application of activated carbon to alleviate taste and odour problems has to be weighed against the cost implications for consumers, the correct type to be purchased for the organic molecules to be adsorbed, the interference of natural organic matter, and the formation of additional sludge mass, as well as the intensity and duration of taste and odour events. Midvaal remains a bulk potable water supplier and therefore has to consider the socio-economic status of their consumers where water pricing is concerned. The study ultimately emphasized the intrinsic value of protecting water resources.

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Photocurrent Response and Progesterone Degradation by Employing WO₃ Films Modified with Platinum and Silver Nanoparticles

Costa

Lima

et al. 2018

ChemPlusChem

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The effect of silver (Ag 0 ) and platinum (Pt 0 ) metallic nanoparticles (NPs) on WO 3 film was investigated by studying the photocurrent response under polychromatic irradiation. The structural phase revealed by X-ray diffraction analysis indicates a monoclinic crystal nanostructure. WO 3, Ag 0 /WO 3, and Pt 0 /WO 3 electrodes were used to degrade 0.35 mg L À 1 progesterone hormone in aqueous solution under polychromatic irradiation for 3h. The studies on degradation were investigated under electrochemically assisted heterogeneous photocatalysis (EHP) conditions. For photodegradation of progesterone, higher performance was achieved when WO 3 was functionalized and when the EHP configuration was adopted with bias at + 0.7 V vs Ag/AgCl. This study reveals that incorporation of metallic NPs onto a semiconductor increases its efficiency, thereby preventing electron-hole recombination in the photocatalyst and photoelectrochemical limitations of WO 3 due to surface plasmon resonance and the trapping state. Therefore, efficient advances in the degradation of organic contaminants during water treatment can be realized.[a] M.

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Advanced Oxidation Processes: Applications in Drinking Water Treatment

Cited by 43 publications

References 135 publications

Modelling and simulation of photocatalytic oxidation mechanism of chlorohalogenated substituted phenols in batch systems: Langmuir–Hinshelwood approach

Modelling and simulation of photocatalytic oxidation mechanism of chlorohalogenated substituted phenols in batch systems: Langmuir–Hinshelwood approach

Challenges in the potable water industry due to changes in source water quality: case study of Midvaal Water Company, South Africa

Photocurrent Response and Progesterone Degradation by Employing WO₃ Films Modified with Platinum and Silver Nanoparticles

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Advanced Oxidation Processes: Applications in Drinking Water Treatment

Cited by 43 publications

References 135 publications

Modelling and simulation of photocatalytic oxidation mechanism of chlorohalogenated substituted phenols in batch systems: Langmuir–Hinshelwood approach

Modelling and simulation of photocatalytic oxidation mechanism of chlorohalogenated substituted phenols in batch systems: Langmuir–Hinshelwood approach

Challenges in the potable water industry due to changes in source water quality: case study of Midvaal Water Company, South Africa

Photocurrent Response and Progesterone Degradation by Employing WO3 Films Modified with Platinum and Silver Nanoparticles

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Product

Resources

About

Photocurrent Response and Progesterone Degradation by Employing WO₃ Films Modified with Platinum and Silver Nanoparticles