Inactivation of four genera of dominant fungal spores in groundwater using UV and UV/PMS: Efficiency and mechanisms

Wen, Gang; Xu, Xiangqian; Zhu, Hong; Huang, Tinglin; Ma, Jun

doi:10.1016/j.cej.2017.07.055

Cited by 93 publications

(32 citation statements)

References 42 publications

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“…The photolytic activation of PMS has been widely reported in literature for the removal of both organic and microbiologic pollutants [7,20,21,22,23]. Some authors have focused their research on the use of UV-C radiation (λ = 254 nm), the main reason being that this wavelength provides enough energy to provoke the rupture of the O–O bond, thus generating sulfate and hydroxyl radicals to degrade pollutants.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Mechanisms for Peroxymonosulfate Activation through the Removal of Methylene Blue: A Case Study

Rodríguez-Chueca

Alonso

Singh

2019

IJERPH

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Industrial activity is one of the most important sources of water pollution. Yearly, tons of non-biodegradable organic pollutants are discharged, at the least, to wastewater treatment plants. However, biological conventional treatments are unable to degrade them. This research assesses the efficiency of photocatalytic activation of peroxymonosulfate (PMS) by two different iron species (FeSO4 and Fe3+-citrate) and TiO2. These substances accelerate methylene blue removal by the generation of hydroxyl and sulfate radicals. The required pH and molar ratios PMS:Fe are crucial variables in treatment optimization. The kinetic removal is reduced by the appearance of scavenger reactions in acidic and basic conditions, as well as by the excess of PMS or iron. The best performance is achieved using an Fe3+-citrate as an iron catalyst, reaching the total removal of methylene blue after 15 min of reaction, with a molar ratio of 3.25:1 (1.62 mM of PMS and 0.5 mM Fe3+-citrate). Fe3+-citrate reached higher methylene blue removal than Fe2+ as a consequence of the photolysis of Fe3+-citrate. This photolysis generates H2O2 and a superoxide radical, which together with hydroxyl and sulfate radicals from PMS activation attack methylene blue, degrading it twice as fast as Fe2+ (0.092 min−1 with Fe2+ and 0.188 min−1 with Fe3+-citrate). On the other hand, a synergistic effect between PMS and titanium dioxide (TiO2) was observed (SPMS/TiO2/UV-A = 1.79). This synergistic effect is a consequence of PMS activation by reaction with the free electron on the surface of TiO2. No differences were observed by changing the molar ratio (1.04:1; 0.26:1 and 0.064:1 PMS:TiO2), reaching total removal of methylene blue after 80 min of reaction.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic Mechanisms for Peroxymonosulfate Activation through the Removal of Methylene Blue: A Case Study

Rodríguez-Chueca

Alonso

Singh

2019

IJERPH

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“…A UV dose of 48 mJ/cm² was required to achieve 1.71 and 2.4 log removal of Trichophyton tonsurans and Trichophyton rubrum, respectively. Higher UV resistance of fungal spores was observed in a study by Wen et al (2017b) which used single strains of Trichoderma sp., Acremonium sp., Penicillium sp., and Cladosporium sp., in their inactivation experiments (2 log removal at a UV dose of 45, 50, 65, 130 mJ/cm², respectively). For comparison, 2 log removal of Cryptosporidium oocysts and Giardia cysts can be achieved at a UV dose of 5.8 mJ/cm² and 5.2 mJ/cm² (U.S. EPA, 2006b), respectively.…”

Section: Disinfection Of Fungi In Swimming Pool Watermentioning

confidence: 87%

Protection of Public Health from Microbial and Chemical Hazards in Swimming Pool Environments

Ekowati¹

2019

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Ozone is a very powerful chemical disinfectant which is able to oxidize organic and inorganic compounds, as well as killing microorganisms. The high oxidizing power is due to the weak bonds of the third oxygen atom causing instability of the ozone molecule. Ozone decomposes rapidly and thus does not provide a residual disinfection effect and has to be generated on-demand at the site of application. Ozone is a stronger oxidant than chlorine, with a higher redox potential (WHO, 2000). In aqueous solution, ozone reacts with organic and inorganic compounds by means of two different mechanisms: direct oxidation by ozone molecules and oxidation by hydroxyl radicals during ozone decomposition (Glaze et al., 1987; Gottschalk et al., 2010; CHAPTER 1 | 5 are applied in drinking water treatment as advanced oxidation processes (AOPs), usually combined with hydrogen peroxide and ozone (Heering, 2004). Contaminants in swimming pools and similar environments Figure 2. Potential microbial and chemical hazards in swimming pools and similar environments (adapted from WHO (2006)) Microbial hazards Microbial contaminants in the pool water can be pathogens originating from faecal matter introduced by humans and animals, from human shedding (e.g. vomit, mucus, saliva, and skin) (WHO, 2006) or from source water and air (Figure 2). Many outbreaks associated with pathogens in swimming pools and similar environments have been reported worldwide (

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“…In addition, other species such as Acremonium sp., Cladosporium sp., Penicillium sp., and Trichoderma sp. have been effectively eliminated using PS and PMS activated by UV-C radiation, the results obtained in PMS treatments being greater in all cases [126]. These good results are probably a consequence of the type of radiation used.…”

Section: Sulfate Radicals Applied In Disinfectionmentioning

confidence: 97%

“…However, the inactivation of other bacteria such as S. aureus, B. mycoides, Enterococcus sp. and various fungus species has also been studied, although to a lesser extent [119,120,126]. Table 8 summarizes the results of all the reports published so far about sulfate-based AOPs applied in disinfection.…”

Section: Sulfate Radicals Applied In Disinfectionmentioning

confidence: 99%

Assessment of Sulfate Radical-Based Advanced Oxidation Processes for Water and Wastewater Treatment: A Review

Guerra-Rodríguez

Rodríguez

Singh

et al. 2018

Water

239

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High oxidation potential as well as other advantages over other tertiary wastewater treatments have led in recent years to a focus on the development of advanced oxidation processes based on sulfate radicals (SR-AOPs). These radicals can be generated from peroxymonosulfate (PMS) and persulfate (PS) through various activation methods such as catalytic, radiation or thermal activation. This review manuscript aims to provide a state-of-the-art overview of the different methods for PS and PMS activaton, as well as the different applications of this technology in the field of water and wastewater treatment. Although its most widespread application is the elimination of micropollutants, its use for the disinfection of wastewater is gaining increasing interest. In addition, the possibility of combining this technology with ultrafiltration membranes to improve the water quality and lifespan of the membranes has also been discussed. Finally, a brief economic analysis of this technology has been undertaken and the different attempts made to implement it at full-scale have been summarized. As a result, this review tries to be useful for all those people working in that area.

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Inactivation of four genera of dominant fungal spores in groundwater using UV and UV/PMS: Efficiency and mechanisms

Cited by 93 publications

References 42 publications

Photocatalytic Mechanisms for Peroxymonosulfate Activation through the Removal of Methylene Blue: A Case Study

Photocatalytic Mechanisms for Peroxymonosulfate Activation through the Removal of Methylene Blue: A Case Study

Protection of Public Health from Microbial and Chemical Hazards in Swimming Pool Environments

Assessment of Sulfate Radical-Based Advanced Oxidation Processes for Water and Wastewater Treatment: A Review

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