Solar photocatalysis for detoxification and disinfection of contaminated water: pilot plant studies

Vidal, Alfonso; Díaz, A.; Hraiki, A. El; Romero, Manuel; Muguruza, I.; Senhaji, Faouzi; Gonzalez, J.H.

doi:10.1016/s0920-5861(99)00189-3

Cited by 86 publications

(42 citation statements)

References 16 publications

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“…Photocatalytic inactivation of bacteria (Bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa, and strains of Streptococci), bacterial spores (B. subtilis spores and Clostridium perfringens spores), fungal spore (Aspergillus niger spores) and virus (Phage Qβ and poliovirus 1) have been investigated (Saito et al, 1992;Watts et al, 1995;Butterfield et al, 1997;Lee et al, 1997;Vidal et al, 1999;Amézaga-Madrid et al, 2002;Dunlop et al, 2002;Wolfrum et al, 2002;Yu et al, 2002). In these inactivation studies, UV (300 -400 nm) or solar light was used as energy source for the photocatalytic disinfection processes.…”

Section: Intorductionmentioning

confidence: 99%

Photocatalytic bactericidal activity of silver-sensitized titanium dioxide on Micrococcus lylae

Yip

Chan³

et al. 2005

J. of Wat. & Envir. Tech.

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Under UV irradiation, titanium dioxide (TiO 2 ) exhibits a strong bactericidal activity through the generation of hydroxyl radicals (•OH). Silver (Ag) sensitization is an effective way to enhance photocatalytic activity of TiO 2 . In the present study, Micrococcus lylae was used as a model bacterium to compare the bactericidal activity of Agsensitized TiO 2 (in two different Ag/TiO 2 molar ratios) and pure TiO 2 (P25). When the concentration of photocatalysts was fixed on 0.2 mg/ml with 300 rpm stirring, no obvious difference observed among the three photocatalysts. However, the Ag-sensitized photocatalysts with higher Ag/TiO 2 ratio showed better bactericidal efficiency when their concentration decreased (0.1 mg/ml) or the stirring speed increased (380 rpm). The results indicated that optimizing the phosico-chemical conditions of reaction promoted the efficiency of photocatalyst. Moreover, transmission electron microscopy (TEM) was used to observe the sub-cellular structural changes of M. lylae during photocatalytic oxidation (PCO). According to the TEM images, the disruption of cell wall occurred at a relatively long time after the cell death. The cause of cell death was the destruction of plasma membrane induced by membrane permeable •OH. These results supported that both modification on photocatalyst properties and optimization on reaction conditions enhanced the bactericidal efficiency of PCO.

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Section: Intorductionmentioning

confidence: 99%

Photocatalytic bactericidal activity of silver-sensitized titanium dioxide on Micrococcus lylae

Yip

Chan³

et al. 2005

J. of Wat. & Envir. Tech.

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“…It is worth noting that usually the application of advanced oxidation processes is limited by their high cost. However, according to Vidal et al, (1999), the estimated total costs for solar photocatalytic degradation of 500 μg l -1 of selected pesticides to maximum permitted levels (0.1 μg l -1…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of estrogens and pathogens from secondary treated wastewater by solar photocatalytic treatment

2014

Global NEST Journal

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Recently, the fate of emerging compounds in environmentally relevant samples has attracted considerable attention. Solar semiconductor photocatalysis may offer an appealing methodology to treat such contaminants. At the same time the use of solar photocatalysis for water and wastewater disinfection is a topic well-documented in the literature. In this respect, the simultaneous degradation of synthetic estrogen 17α-ethynylestradiol (EE2) and Escherichia coli removal employing simulated solar radiation and TiO 2 as the photocatalyst was investigated. In general, the more complex the water matrix is the slower E. coli removal becomes, while the presence of E. coli in the reaction mixture did not obstruct EE2 removal.Although EE2 removal occurred relatively fast, overall estrogenic activity was only partially removed. This implies that other species inherently present in the effluent and/or some photocatalytic transformation by-products may be proportionately more estrogenic than EE2. Overall, the use of solar radiation can constitute an advantageous treatment strategy for the simultaneous removal of micropollutants and pathogens from secondary treated effluent.

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“…It is relatively inexpensive, insoluble in water and nonpoisonous. (Vidol, et al, 1999). The process of photocatalysis is relatively simple.…”

Section: Introductionmentioning

confidence: 99%

Efficiency removal of phenol, lead and cadmium by means of UV/TiO2/H2O2 processes

Samarghandi

Nouri

Mesdaghinia

et al. 2007

Int. J. Environ. Sci. Technol.

114

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A variety of processes can be used in treatment of industrial wastewaters. The relatively newest of which is photo catalysis with titanium dioxide which may also be used plus hydrogen peroxide to improve the treatment rate. In this study, photo catalysis/ hydrogen peroxide processes had been employed for the removal of phenol, lead and cadmium by three different pHs of 3.5, 7 and 11. The treatment tests were also accomplished without UV irradiation. In both experiments, the variables were pH and concentrations of reagent chemicals, but the detention time was kept constant (180 min). Results indicated that the optimum efficiencies of phenol and Cd removal were 76 % and 97.7 % at pH=11, respectively, and for lead, it was 98.8% in all pHs. In other words, no pH dependency was regarded for lead treatment. These results were all obtained by simultaneous use of UV irradiation with 3 mL/L H 2 O 2 and 0.8 g/L TiO 2 . Finally, the best pH for treatment, when all the three contaminants are presented is considered to be at 11. These results should be regarded by all industrial treatment plants which have experienced the problem of these three special contaminants in their effluents.

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Solar photocatalysis for detoxification and disinfection of contaminated water: pilot plant studies

Cited by 86 publications

References 16 publications

Photocatalytic bactericidal activity of silver-sensitized titanium dioxide on Micrococcus lylae

Photocatalytic bactericidal activity of silver-sensitized titanium dioxide on Micrococcus lylae

Simultaneous removal of estrogens and pathogens from secondary treated wastewater by solar photocatalytic treatment

Efficiency removal of phenol, lead and cadmium by means of UV/TiO2/H2O2 processes

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