Wild bacteria inactivation in WWTP secondary effluents by solar photo-fenton at neutral pH in raceway pond reactors

García, Blanca C.; Rivas, G.; Arzate, S.; Pérez, J.A. Sánchez

doi:10.1016/j.cattod.2017.10.031

Cited by 37 publications

(26 citation statements)

References 25 publications

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“…The CWPO experiments of NAP were performed at different temperatures (30,50, and 70 • C), maintaining constant the values of H 2 O 2 dosage (1.5 mM), pH (5), and catalyst dose (1 g/L). All the experiments were accomplished during 3 h reaction time.…”

Section: Reaction Kinetics and Activation Energy Determinationmentioning

confidence: 99%

Optimization Parameters, Kinetics, and Mechanism of Naproxen Removal by Catalytic Wet Peroxide Oxidation with a Hybrid Iron-Based Magnetic Catalyst

et al. 2019

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This work presents a study of the assessment of the operating parameters of the catalytic wet peroxide oxidation (CWPO) of naproxen (NAP) using magnetite/multi-walled carbon nanotubes (Fe3O4/MWCNTs) as a catalyst. The effect of pH, temperature, and H2O2 dosage on CWPO process was evaluated by using the response surface model (RSM), allowing us to obtain an optimum NAP removal of 82% at the following operating conditions: pH = 5, T = 70 °C, [H2O2]0 = 1.5 mM, and [NAP]0 = 10.0 mg/L. Therefore, NAP degradation kinetics were revealed to follow a pseudo-second-order kinetic model, and an activation energy value of 4.75 kJ/mol was determined. Adsorption and using only H2O2 experiments, both considered as blank tests, showed no significant removal of the pollutant. Moreover, Fe3O4/MWCNTs material exhibited good recyclability along three consecutive cycles, finding an average NAP removal percentage close to 80% in each cycle of 3 h reaction time. In addition, the scavenging tests confirmed that the degradation of NAP was mainly governed by •OH radicals attack. Two reaction sequences were proposed for the degradation mechanism according to the detected byproducts. Finally, the versatility of the catalyst was evidenced in the treatment of different environmentally relevant aqueous matrices (wastewater treatment plant effluent (WWTP), surface water (SW), and a hospital wastewater (HW)) spiked with NAP, obtaining total organic carbon (TOC) removal efficiencies after 8 h in the following order: NAP-SW > NAP-HW > NAP-WWTP.

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Section: Reaction Kinetics and Activation Energy Determinationmentioning

confidence: 99%

Optimization Parameters, Kinetics, and Mechanism of Naproxen Removal by Catalytic Wet Peroxide Oxidation with a Hybrid Iron-Based Magnetic Catalyst

et al. 2019

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“…In some cases, CWPO as a pre-treatment step for wastewater cannot be economically feasible due to the high cost of hydrogen peroxide. We have estimated the cost of H 2 O 2 as a function of the initial concentration of organic compounds in wastewater ( Figure 5A), while considering that the price of H 2 O 2 is 0.45 €/L [63,64]. Different catalysts can be used for CWPO; hence, the cost can vary significantly.…”

Section: Cost Estimationmentioning

confidence: 99%

“…Generally, when CWPO is applied as a post-treatment process, lower concentrations of H 2 O 2 are used in comparison with CWPO that is applied as pre-treatment process. Taking into account that that the cost of H 2 O 2 reagent is 0.45 €/L [63,64], the cost of H 2 O 2 that is used during CWPO can be estimated to be 0.10-4.63 €/m 3 (see Figure 5B). From this estimation, it can be seen that when the required concentration of H 2 O 2 is relatively high, CWPO is not economically viable.…”

Section: Cost Estimationmentioning

confidence: 99%

Application of Catalytic Wet Peroxide Oxidation for Industrial and Urban Wastewater Treatment: A Review

2018

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Catalytic wet peroxide oxidation (CWPO) is emerging as an advanced oxidation process (AOP) of significant promise, which is mainly due to its efficiency for the decomposition of recalcitrant organic compounds in industrial and urban wastewaters and relatively low operating costs. In current study, we have systemised and critically discussed the feasibility of CWPO for industrial and urban wastewater treatment. More specifically, types of catalysts the effect of pH, temperature, and hydrogen peroxide concentrations on the efficiency of CWPO were taken into consideration. The operating and maintenance costs of CWPO applied to wastewater treatment and toxicity assessment were also discussed. Knowledge gaps were identified and summarised. The main conclusions of this work are: (i) catalyst leaching and deactivation is one of the main problematic issues; (ii) majority of studies were performed in semi-batch and batch reactors, while continuous fixed bed reactors were not extensively studied for treatment of real wastewaters; (iii) toxicity of wastewaters treated by CWPO is of key importance for possible application, however it was not studied thoroughly; and, (iv) CWPO can be regarded as economically viable for wastewater treatment, especially when conducted at ambient temperature and natural pH of wastewater.

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“…This fact can be an issue when the photo-Fenton process is selected for disinfecting wastewater, thus the survival of the majority of the monitored pathogens decreases or even dies at acidic pH (pH < 3). In order to deal with this blockage and evaluate the inactivation of pathogen organisms by the photo-Fenton process, several studies were performed at pH over 4, where microbes are able to survive [49,55,56]. In order to inactivate microbial cells for photocatalysis by TiO 2 , a critical fact is the internal cellular damage produced by acts of reactive oxygen species (ROS), such as HO•, just as for photocatalysis by TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

“…The presence of antibiotics in effluents has increased in the past year. In particular, urban [56] and hospital wastewaters [57] are among common ARB spread and anthropogenic sources into the aquatic world. Finding an effective and advanced technology to remove antibiotic compounds from treated water has been a major study focus for many years.…”

Section: Introductionmentioning

confidence: 99%

Wastewater Treatment by Advanced Oxidation Process and Their Worldwide Research Trends

Garrido-Cárdenas

Esteban-García

Agüera

et al. 2019

IJERPH

296

114

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Background: Water is a scarce resource and is considered a fundamental pillar of sustainable development. The modern development of society requires more and more drinking water. For this cleaner wastewater, treatments are key factors. Among those that exist, advanced oxidation processes are being researched as one of the sustainable solutions. The main objective of this manuscript is to show the scientific advances in this field. Methods: In this paper, a systematic analysis of all the existing scientific works was carried out to verify the evolution of this line of research. Results: It was observed that the three main countries researching this field are China, Spain, and the USA. Regarding the scientific collaboration between countries, three clusters were detected—one of Spain, one of China and the USA, and one of Italy and France. The publications are grouped around three types of water: industrial, urban, and drinking. Regarding the research, 15 clusters identified from the keywords analyzed the advanced oxidation process (alone or combined with biological oxidation) with the type of wastewater and the target pollutant, removal of which is intended. Finally, the most important scientific communities or clusters detected in terms of the number of published articles were those related to the elimination of pollutants of biological origin, such as bacteria, and of industrial nature, such as pesticides or pharmaceutical products.

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Wild bacteria inactivation in WWTP secondary effluents by solar photo-fenton at neutral pH in raceway pond reactors

Cited by 37 publications

References 25 publications

Optimization Parameters, Kinetics, and Mechanism of Naproxen Removal by Catalytic Wet Peroxide Oxidation with a Hybrid Iron-Based Magnetic Catalyst

Optimization Parameters, Kinetics, and Mechanism of Naproxen Removal by Catalytic Wet Peroxide Oxidation with a Hybrid Iron-Based Magnetic Catalyst

Application of Catalytic Wet Peroxide Oxidation for Industrial and Urban Wastewater Treatment: A Review

Wastewater Treatment by Advanced Oxidation Process and Their Worldwide Research Trends

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