Engineering and modeling perspectives on photocatalytic reactors for water treatment

Wang, Dawei; Mueses, Miguel Ángel; Márquez, José Angel Colina; Machuca-Martínez, Fiderman; Grčić, Ivana; Moreira, Rodrigo Peralta Muniz; Puma, Gianluca Li

doi:10.1016/j.watres.2021.117421

Cited by 109 publications

(43 citation statements)

References 217 publications

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“…A couple of pilot plants using both parabolic trough collectors and nonconcentrating collectors have been used for the treatment of a variety of effluents . Nonconcentrating collectors often suffer from unfavorable weather conditions, lower mass transfer rates of the pollutants to the surface of the catalyst due to the prevailing laminar flow and sedimentation of the catalysts . A compound parabolic concentrator (CPC) photoreactor has cylindrical reactors covered with a parabolic reflective surface, which can capture both the direct and diffused sunlight and hence can be used on both clear and overcast days (Figure D).…”

Section: Advancement In Visible Light Photoreactors For Wastewater Tr...mentioning

confidence: 99%

Challenges Facing Sustainable Visible Light Induced Degradation of Poly- and Perfluoroalkyls (PFA) in Water: A Critical Review

2022

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Poly-and perfluoroalkyls (PFAs) are now designated as serious threats to the environment. More than 4700 PFAs, along with their precursors, show a high degree of persistence and long-range spreading in soils and waters causing recalcitrant bioaccumulation in plants, fish, birds, and mammals causing health hazards all along the food chain. Visible-light induced degradation of PFA in pure water using photocatalysts, a potentially sustainable advanced oxidation process, showed exciting results in laboratories for both complete and partial mineralization of these toxins. However, none of the methods and materials have been considered so far for upscaling toward practical applications due to several hard-to-resolve challenges. This Review provides a critical analysis of the recent advancements in photocatalytic remediation of aqueous PFA under visible light irradiation and addresses possible future directions to valorize some of the prospective methods and materials to practical applications.

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Section: Advancement In Visible Light Photoreactors For Wastewater Tr...mentioning

confidence: 99%

Challenges Facing Sustainable Visible Light Induced Degradation of Poly- and Perfluoroalkyls (PFA) in Water: A Critical Review

2022

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“…A comparison of reactor systems is possible by a number of performance indicators [12,13]. In the context of economic competitiveness, the energy efficiency is an important parameter if artificial irradiation is used Wang et al 2021 [14]. The electrical energy required to degrade a pollutant by a factor of 10 in relation to the volume of water treated is called electrical energy per order (EE/O) and is usually given as a characteristic value [14].…”

Section: Introductionmentioning

confidence: 99%

“…In the context of economic competitiveness, the energy efficiency is an important parameter if artificial irradiation is used Wang et al 2021 [14]. The electrical energy required to degrade a pollutant by a factor of 10 in relation to the volume of water treated is called electrical energy per order (EE/O) and is usually given as a characteristic value [14]. Within the literature, values from 5 * 10 4 up to 10 −1 kWh/m 3 are reported for different pollutants and reactor systems [14].…”

Section: Introductionmentioning

confidence: 99%

“…The electrical energy required to degrade a pollutant by a factor of 10 in relation to the volume of water treated is called electrical energy per order (EE/O) and is usually given as a characteristic value [14]. Within the literature, values from 5 * 10 4 up to 10 −1 kWh/m 3 are reported for different pollutants and reactor systems [14]. Most of these systems described in [12] are in the range of 10-50 kWh/m 3 .…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Energetic Efficiency of Reactor Systems for Oxidation of Micro-Pollutants by Immobilized Active Titanium Dioxide Photocatalysis

Mehling

Schnabel

Londong

2022

Water

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In this work, the degradation performance for the photocatalytic oxidation of eight micro-pollutants (amisulpride, benzotriazole, candesartan, carbamazepine, diclofenac, gabapentin, methlybenzotriazole, and metoprolol) within real secondary effluent was investigated using three different reactor designs. For all reactor types, the influence of irradiation power on its reaction rate and energetic efficiency was investigated. Flat cell and batch reactor showed almost similar substance specific degradation behavior. Within the immersion rotary body reactor, benzotriazole and methyl-benzotriazole showed a significantly lower degradation affinity. The flat cell reactor achieved the highest mean degradation rate, with half time values ranging from 5 to 64 min with a mean of 18 min, due to its high catalysts surface to hydraulic volume ratio. The EE/O values were calculated for all micro-pollutants as well as the mean degradation rate constant of each experimental step. The lowest substance specific energy per order (EE/O) values of 5 kWh/m3 were measured for benzotriazole within the batch reactor. The batch reactor also reached the lowest mean values (11.8–15.9 kWh/m3) followed by the flat cell reactor (21.0–37.0 kWh/m3) and immersion rotary body reactor (23.9–41.0 kWh/m3). Catalyst arrangement and irradiation power were identified as major influences on the energetic performance of the reactors. Low radiation intensities as well as the use of submerged catalyst arrangement allowed a reduction in energy demand by a factor of 3–4. A treatment according to existing treatment goals of wastewater treatment plants (80% total degradation) was achieved using the batch reactor with a calculated energy demand of 7000 Wh/m3.

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“…Likewise, the study of PWT has demonstrated that a misbalance between the radiation field and fluid residence time leads to inefficient reactors. This is because photocatalytic processes are kinetically slow and need long periods of time for total pollutant elimination from water samples [21][22][23]. So, in order to obtain greater efficiency in water treatment, UV PWT reactors with serpentine-like geometry have been developed.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Treatment of Stained Wastewater Coming from Handicraft Factories. A Case Study at the Pilot Plant Level

Mesa

Niño

González

et al. 2021

Water

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UV/H2O2 process and TiO2-based photocatalysis were studied in the present work. The effectiveness of these methods was tested in the treatment of effluents taken from handicraft factories. Microorganisms, dyes, and different organic pollutants were detected in the industrial effluents. The experimental procedure for the wastewater treatment was carried out in a patented sunlight reactor on a pilot plant scale. From this study, UV/H2O2 was found to be the best treatment for dye elimination. The optimal peroxide dosage for the degradation of dyes and the elimination of bacteria was 0.07 M. In this case, 70.80% of discoloration was achieved after 7 h of sunlight exposure, under an average sunlight intensity of 3.42 W/m2. The photocatalytic treatment based on TiO2 achieved the highest elimination of coliform bacteria and the lowest TOC value; however, the presence of this material in the reactor had a detrimental effect on the overall elimination of dyes. A combination of both UV/H2O2 and TiO2 treatments significantly improves the dyes discoloration, the elimination of bacteria, and the organic compounds degradation. Some of the results of this study were presented at the 4th Congreso Colombiano de Procesos Avanzados de Oxidación, 4CCPAOx.

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Engineering and modeling perspectives on photocatalytic reactors for water treatment

Cited by 109 publications

References 217 publications

Challenges Facing Sustainable Visible Light Induced Degradation of Poly- and Perfluoroalkyls (PFA) in Water: A Critical Review

Challenges Facing Sustainable Visible Light Induced Degradation of Poly- and Perfluoroalkyls (PFA) in Water: A Critical Review

Investigation on Energetic Efficiency of Reactor Systems for Oxidation of Micro-Pollutants by Immobilized Active Titanium Dioxide Photocatalysis

Photocatalytic Treatment of Stained Wastewater Coming from Handicraft Factories. A Case Study at the Pilot Plant Level

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