Synergistic effect of UV–vis and solar photocatalytic ozonation on the degradation of phenol in municipal wastewater: A comparative study

Mecha, Achisa C.; Ochieng, Aoyi; Fourie, C.J.S.; Momba, Maggy Ndombo Benteke

doi:10.1016/j.jcat.2016.06.015

Cited by 80 publications

(41 citation statements)

References 40 publications

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“…However, there are some limitations associated with some of these methods such as operational cost and inefficient operation leading to downstream problems such as an increase in chemical oxygen demand (COD) and SOG [7], [8]. An improper operation of a municipal wastewater treatment plant (WWTP) led to the pollution of various water bodies thereby posing health and social economic threat to the needy [9]. In South Africa, to address and balance the environmental protection, economic viability of recovered oil (lubricant oil) and water (irrigation) has led to strict regulation for the discharge of the effluent [1].…”

Section: Introductionmentioning

confidence: 99%

Pre-Treatment of Industrial Mineral Oil Wastewater Using Response Surface Methodology

Tetteh¹,

Rathilal²,

Chollom³

2017

WIT Transactions on Ecology and the Environment

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This study focuses on the process optimization of coagulation floatation by cross-interaction effects of the following multiple factors: pH, coagulant dosage and floatation time on the response of chemical oxidation demand (COD), soap oil and grease (SOG), turbidity and total suspended solids (TSS). The results from the response surface methodology incorporated with Box Benken design (BBD) models reveals significant correlations and interactions between the manipulated and response variables. To establish the optimum pre-treatment conditions, the experiment used the design BBD, using Design Expert (Design Expert 10.0.3) software. This ensures that the process engineers and scientists gain a better understanding of the practical application of the experimental results over the conventional method of one-factor-at-time (OFAT). The recent trend in industrialization and population growth has indeed deepened the demand on the world's energy (oil) and water resources. However, the need to meet the significance of energy and water for sustainable social economy growth and development has resulted in extremely adverse effects on water and environmental pollution. South Africa, well known as a water scarcity country, has also intensified its policy and increased fines for offenders who do not meet its regulations and discharge limits. In this context, the treatment of industrial mineral oil wastewater, which is regarded as hazardous and harmful to the environment, derived from petrochemical and oil refinery industries, has a recovery value. This has raised attention for systematic technology and approach in recovering oil and water for reuse to conserve the supply of fresh water and energy resources.

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Section: Introductionmentioning

confidence: 99%

Pre-Treatment of Industrial Mineral Oil Wastewater Using Response Surface Methodology

Tetteh¹,

Rathilal²,

Chollom³

2017

WIT Transactions on Ecology and the Environment

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“…The photocatalytic effect in “UV + Zn 0.9 Fe 0.1 S + H 2 O 2 ” system is largely greater than that of single systems of Zn 0.9 Fe 0.1 S, H 2 O 2 and UV light separately. The results indicate that ZnFeS and H 2 O 2 exert a good synergy under the light irradiation, which has played a leading role in the photocatalytic degradation of BPA and improved the BPA removal ability significantly . The BPA's mineralization efficiency is depicted in Fig.…”

Section: Resultsmentioning

confidence: 91%

“…The results indicate that ZnFeS and H 2 O 2 exert a good synergy under the light irradiation, which has played a leading role in the photocatalytic degradation of BPA and improved the BPA removal ability significantly (34,35). The BPA's mineralization efficiency is depicted in Fig.…”

Section: Degradation Mechanismmentioning

confidence: 91%

Optimization and Degradation Mechanism of Photocatalytic Removal of Bisphenol A Using Zn_0.9Fe_0.1S Synthesized by Microwave‐assisted Method

Xue

Zhang

et al. 2016

Photochem & Photobiology

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The sulfide photocatalyst of Zn Fe S was successfully synthesized by a facile microwave-assisted method, and Zn Fe S photocatalysts were characterized using SEM, EDX, XRD and BET. The specific surface area of synthesized Zn Fe S is 78.1 m g , and total pore volume is 0.4 cm g . With bisphenol A (BPA) as a target pollutant, photocatalytic system of UV + Zn Fe S + H O was set up. Some influencing parameters, including H O dosage, initial pH value, initial concentration of BPA and Zn Fe S dosage, were investigated, and the stability of the Zn Fe S was also studied during the photocatalysis. The optimum values of operating parameters were found at an initial pH value of 5.0, a H O dosage of 0.15 mmol L and a Zn Fe S dosage of 0.08 g when the initial concentration of BPA was 10 mg L . Under the optimal conditions, the highest removal rate of BPA achieved 95%. After seven consecutive reaction cycles, the degradation efficiency of BPA could still reach 85% and there was only a little dissolution of Zn and Fe . Compared with the traditional photo-Fenton system, the UV + Zn Fe S + H O system can not only improve the degradation efficiency of BPA, but also reduce the dosage of H O and thus reduce the processing cost.

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“…For all the responses, it was observed that the catalyst loading was held at a constant at while the pH and the antibiotics concentration changed. The optimal regions for R1 were found to be pH (3)(4)(5), antibiotics concentration (10-25 mg/L). R2 values were; pH (3)(4) and antibiotics concentration (30-50 mg/L).…”

Section: Response Surface and Optimisationmentioning

confidence: 99%

“…The risk analysis of these contaminants has shown their negative impacts on the environment, such as development of antibiotics resistant bacterial and anti-resistant genes, both said to be associated with risk to human and animals [4]. Alternative methods of treatment such as advanced oxidation processes (AOPs) have shown to be able to deal with this kind of contaminants [2], [5]. AOPs reactions are based on the production of hydroxide radicals ( • OH) which are produced in the first step of the reaction.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Veterinary Antibiotics From Slaughterhouse Wastewater Using Titanium Dioxide as a Catalyst

Chollom

Rathilal

Swalaha

et al. 2018

WIT Transactions on Ecology and the Environment

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Antibiotics (ABs) and other pharmaceuticals are designed to be effectively bioactive against certain human and animal pathogens. It has been confirmed that some of these compounds are metabolized in animals by up to 90% or more, while others are metabolized by 10% or less. The residues find their way into the environment. Titanium dioxide (TiO2) has been extensively applied as a catalyst under UV/solar irradiation to degrade antibiotics due to the advantages it offers. The study presented here evaluated the use of TiO2 as a catalyst for the degradation of three antibiotics; namely; ciprofloxacin, enrofloxacin and sulfamethazine. Response surface methodology was used for the optimisation and modelling of independent variables, namely TiO2 dosage, antibiotics concentration and pH, based on the Box-Behnken (BB) experimental design. Photodegradation of three veterinary antibiotics was shown to be effective using TiO2 as a catalyst. The degradation of antibiotics depended on the chosen variables. The results from the experiment were fitted into the polynomial equation which was used to further elaborate optimisation. The value of determination of coefficient R 2 were above 0.9 for R1 and R2 and above 0.6 for R3, thus verifying the model fitting. Finally, the optimum conditions for the degradation of the selected antibiotics were obtained which were R1; pH (3-5), antibiotics concentration (10-25 mg/L). R2; pH (3-4) and antibiotics concentration (30-50 mg/L) and finally R3; pH (10) and antibiotics concentration of 15 mg/L.

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Synergistic effect of UV–vis and solar photocatalytic ozonation on the degradation of phenol in municipal wastewater: A comparative study

Cited by 80 publications

References 40 publications

Pre-Treatment of Industrial Mineral Oil Wastewater Using Response Surface Methodology

Pre-Treatment of Industrial Mineral Oil Wastewater Using Response Surface Methodology

Optimization and Degradation Mechanism of Photocatalytic Removal of Bisphenol A Using Zn_0.9Fe_0.1S Synthesized by Microwave‐assisted Method

Degradation of Veterinary Antibiotics From Slaughterhouse Wastewater Using Titanium Dioxide as a Catalyst

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Synergistic effect of UV–vis and solar photocatalytic ozonation on the degradation of phenol in municipal wastewater: A comparative study

Cited by 80 publications

References 40 publications

Pre-Treatment of Industrial Mineral Oil Wastewater Using Response Surface Methodology

Pre-Treatment of Industrial Mineral Oil Wastewater Using Response Surface Methodology

Optimization and Degradation Mechanism of Photocatalytic Removal of Bisphenol A Using Zn0.9Fe0.1S Synthesized by Microwave‐assisted Method

Degradation of Veterinary Antibiotics From Slaughterhouse Wastewater Using Titanium Dioxide as a Catalyst

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Product

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Optimization and Degradation Mechanism of Photocatalytic Removal of Bisphenol A Using Zn_0.9Fe_0.1S Synthesized by Microwave‐assisted Method