Strategies for selecting indicator compounds to assess attenuation of emerging contaminants during UV advanced oxidation processes

Yu, Hye Weon; Park, Minkyu; Wu, Shimin; Lopez, Israel J.; Ji, Weikang; Scheideler, Jens; Snyder, Shane A.

doi:10.1016/j.watres.2019.115030

Cited by 27 publications

(24 citation statements)

References 22 publications

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“…Photodegradation efficiency depends on parameters such as the molar absorption coefficient (ε) and quantum yield (Φ) at the wavelength (λ) [35]. Because the photon energy of the UV irradiation applied to the water is assumed to be almost constant, the decomposition rate of the compound by UV direct photolysis is proportional to the photodegradation of the target compound, which can be defined by multiplying by ε and Φ. PhACs in group 1 have higher ε and Φ values than other groups, so they showed higher photo-degradability values [24,36].…”

Section: Categorization Of Groups Of Phacs According To Their Decomposition Propertiesmentioning

confidence: 99%

Model Predictive Control Strategy for the Degradation of Pharmaceutically Active Compounds by UV/H2O2 Oxidation Process

Lee

Nam

Koo

et al. 2022

Water

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Hydroxyl radical (•OH) scavenging demand can be an indicator that represents the water quality characteristics of raw water. It is one of the key parameters predicting UV/H2O2 system performance and affects the operating parameters. Based on the •OH scavenging demand, we developed a model predictive control strategy to meet the target compound removal efficiency and energy consumption simultaneously. Selected pharmaceutically active compounds (PhACs) were classified into three groups depending on the UV direct photolysis and susceptibility to •OH. Group 1 for photo-susceptible PhACs (acetaminophen, amoxicillin, diclofenac, iopromide, ketoprofen, and sulfamethoxazole); group 2 for PhACs susceptible to both direct photolysis and •OH oxidation (bisphenol A, carbamazepine, ibuprofen, naproxen, ciprofloxacin, and tetracycline); and group 3 for photo-resistant PhACs (atenolol, atrazine, caffeine, and nitrobenzene). The results of modeling to achieve 90% removal of PhACs at N and B plants were as follows. For group 2, the optimized operating parameter ranges were as follow (N plant: UV 510–702 mJ cm−2, H2O2 2.96–3.80 mg L−1, EED 1088–1302 kWh m−3; B plant: UV dose 1179–1397 mJ cm−2, H2O2 dose 3.56–7.44 mg L−1, EED 1712–2085 kWh m−3). It was confirmed that the optimal operating conditions and EED values changed according to the •OH scavenging demand.

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Section: Categorization Of Groups Of Phacs According To Their Decomposition Propertiesmentioning

confidence: 99%

Model Predictive Control Strategy for the Degradation of Pharmaceutically Active Compounds by UV/H2O2 Oxidation Process

Lee

Nam

Koo

et al. 2022

Water

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“…These EEM features could be used to predict the removal of CECs. Lastly, the physicochemical signal detection relies on the physiochemical reaction to light onto the sample and is highly dependent on the compounds being monitored [153]. Infrared spectroscopy was also explored to detect a low concentration of CECs.…”

Section: Light-driven Detection Of Cec In Treatment Systemsmentioning

confidence: 99%

“…The average E EO of the systems computed is 98.8, 5.11, 20.92, 37.18, 16.67, 2.62, and 76.80 kWh m −3 for UV only, UV/oxidant, UV/O 3 , photocatalyst, UV/Fenton, solar/Fenton, and UV/combination, respectively. UV and UV/oxidant strength and selectivity of oxidants result in certain CECs having better degradation than others [153], hence resulting in a varied computation. It was also noted that for selected studies relatively low initial concentration (<0.01 mg/L) of CECs used in the study for UV/oxidant, compared to other processes also likely contributed to the low E EO values.…”

Section: Cost-benefit Analysis Of Light-driven Aops On the Treatment Of Cecsmentioning

confidence: 99%

Emerging Contaminants: An Overview of Recent Trends for Their Treatment and Management Using Light-Driven Processes

Lee

Lim

Loh

et al. 2021

Water

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The management of contaminants of emerging concern (CECs) in water bodies is particularly challenging due to the difficulty in detection and their recalcitrant degradation by conventional means. In this review, CECs are characterized to give insights into the potential degradation performance of similar compounds. A two-pronged approach was then proposed for the overall management of CECs. Light-driven oxidation processes, namely photo/Fenton, photocatalysis, photolysis, UV/Ozone were discussed. Advances to overcome current limitations in these light-driven processes were proposed, focusing on recent trends and innovations. Light-based detection methodology was also discussed for the management of CECs. Lastly, a cost–benefit analysis on various light-based processes was conducted to access the suitability for CECs degradation. It was found that the UV/Ozone process might not be suitable due to the complication with pH adjustments and limited light wavelength. It was found that EEO values were in this sequence: UV only > UV/combination > photocatalyst > UV/O3 > UV/Fenton > solar/Fenton. The solar/Fenton process has the least computed EEO < 5 kWh m−3 and great potential for further development. Newer innovations such as solar/catalyst can also be explored with potentially lower EEO values.

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“…Ace K photolysis in sunlight is very slow and ineffective [7,8] or does not occur at all [9]. UV light photolysis revealed low (LP-UV Hg lamps and MP-UV Hg lamps [10], UV-LED sources of light [11], and LP-UV Hg lamps 0.75 mW cm −2 [12]), or no (22W low pressure mercury lamps [13]) degradation efficiency. Boron-doped diamond [14], PbO 2 , and Pt [15] were found to be effective in Ace K electro-oxidation processes.…”

Section: Introductionmentioning

confidence: 99%

Acesulfame K Photodegradation over Nitrogen-Doped TiO2

et al. 2021

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Acesulfame K is a zero-calorie alternative to sugar used worldwide. There is contradictory information on the toxicity of the compound, but its accumulation in the aquatic environment is undeniable. In this study, one-pot sol-gel synthesis was used to obtain nitrogen-doped TiO2 photocatalysts. Doping up to 6.29 wt % of nitrogen caused an increase in the surface area of the catalysts (48.55–58.23 m2∙g−1) and a reduction of the pHPZC value (5.72–5.05). Acesulfame K photodegradation was tested at the initial concentration of 20–100 ppm and the catalyst concentration at the level of 1 g∙L−1. Compared to the pure anatase, 4.83–6.29 wt % nitrogen-doped TiO2 showed an effective photodegradation of Acesulfame K. Ninety percent molecule removal was obtained after ~100 min, ~90 min, and ~80 min for initial concentrations of 20 ppm, 50 ppm, and 100 ppm, respectively. The increased activity of the catalysts is due to the modification of the TiO2 lattice structure and probably the limitation of the photogenerated electron/hole charge carrier recombination. It was shown that the electrostatic interactions between Acesulfame K and the catalyst surface play an important role in the photodegradation efficiency.

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Strategies for selecting indicator compounds to assess attenuation of emerging contaminants during UV advanced oxidation processes

Cited by 27 publications

References 22 publications

Model Predictive Control Strategy for the Degradation of Pharmaceutically Active Compounds by UV/H2O2 Oxidation Process

Model Predictive Control Strategy for the Degradation of Pharmaceutically Active Compounds by UV/H2O2 Oxidation Process

Emerging Contaminants: An Overview of Recent Trends for Their Treatment and Management Using Light-Driven Processes

Acesulfame K Photodegradation over Nitrogen-Doped TiO2

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