Pharmaceuticals, benzene, toluene and chlorobenzene removal from contaminated groundwater by combined UV/H 2 O 2  photo-oxidation and aeration

Lhotský, Ondřej; Krákorová, Eva; Mašín, Pavel; Žebrák, Radim; Linhartová, Lucie; Křesinová, Zdena; Kašlík, Josef; Steinová, Jana; Rødsand, Torgeir; Filipová, Alena; Petrů, Klára; Kroupová, Kristýna; Cajthaml, Tomáš

doi:10.1016/j.watres.2017.04.076

Cited by 50 publications

(16 citation statements)

References 18 publications

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“…Because O 2 is produced when H 2 O 2 decomposes through transition metal-catalyzed reactions, this process increases dissolved oxygen concentrations in the subsurface. This is potentially beneficial because aerobic biodegradation of residual organic contaminants (e.g., transformation products formed by the UV/H 2 O 2 process) tends to be more effective than biotransformation that takes place under anoxic or anaerobic conditions ( Lhotský et al., 2017 ; Mikkonen et al., 2018 ; Regnery et al., 2017 ; Ying et al., 2008 ).…”

Section: Resultsmentioning

confidence: 99%

An electrochemical advanced oxidation process for the treatment of urban stormwater

Duan

Sedlak

2021

Water Research X

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Highlights Pre-production of concentrated H 2 O 2 before treatment reduced the system footprint. System design was optimized based on H 2 O 2 generation, storage, and activation. Optimization reduced cost and footprint of electrochemical stormwater treatment.

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Section: Resultsmentioning

confidence: 99%

An electrochemical advanced oxidation process for the treatment of urban stormwater

Duan

Sedlak

2021

Water Research X

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“…In fact, when pharmaceutical products become very harmful and our groundwater is at risk of contamination, we must become involved, like Lhotsky et al [149]. They noted the presence of pharmaceutical plants for more than 80 years in the Czech Republic.…”

Section: Aops/adsorption As a Promising Alternative Treatment Techniquementioning

confidence: 99%

Removal of Pharmaceuticals from Water by Adsorption and Advanced Oxidation Processes: State of the Art and Trends

et al. 2021

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Pharmaceutical products have become a necessary part of life. Several studies have demonstrated that indirect exposure of humans to pharmaceuticals through the water could cause negative effects. Raw sewage and wastewater effluents are the major sources of pharmaceuticals found in surface waters and drinking water. Therefore, it is important to consider and characterize the efficiency of pharmaceutical removal during wastewater and drinking-water treatment processes. Various treatment options have been investigated for the removal/reduction of drugs (e.g., antibiotics, NSAIDs, analgesics) using conventional or biological treatments, such as activated sludge processes or bio-filtration, respectively. The efficiency of these processes ranges from 20–90%. Comparatively, advanced wastewater treatment processes, such as reverse osmosis, ozonation and advanced oxidation technologies, can achieve higher removal rates for drugs. Pharmaceuticals and their metabolites undergo natural attenuation by adsorption and solar oxidation. Therefore, pharmaceuticals in water sources even at trace concentrations would have undergone removal through biological processes and, if applicable, combined adsorption and photocatalytic degradation wastewater treatment processes. This review provides an overview of the conventional and advanced technologies for the removal of pharmaceutical compounds from water sources. It also sheds light on the key points behind adsorption and photocatalysis.

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“…To increase the oxidising potential of H 2 O 2 , this oxidant must be activated to produce radical species able to degrade recalcitrant compounds such as chlorobenzenes. Hydrogen peroxide activation by UV [9,10], UV and ozone [11], soluble iron (Fenton reaction) [12][13][14], iron nanoparticles (Fenton-like reaction) [15], and power (electro Fenton) [16] has been reported in the literature for the abatement of chlorobenzenes. Despite their effectiveness, several drawbacks remain, such as the high cost associated, the need to operate at acidic pH, and the generation of iron in solution, which must be removed in additional treatments (for example, the neutralisation, separation, and management of the iron hydroxide sludge generated) [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Abatement of 1,2,4-Trichlorobencene by Wet Peroxide Oxidation Catalysed by Goethite and Enhanced by Visible LED Light at Neutral pH

et al. 2021

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There is significant environmental concern about chlorinated organic compounds (COCs) in wastewater, surface water, and groundwater due to their low biodegradability and high persistence. In this work, 1,2,4-trichlorobenzene (124-TCB) was selected as a model compound to study its abatement using wet peroxide oxidation at neutral pH with goethite as a heterogeneous catalyst, which was enhanced with visible monochromatic light-emitting diode (LED) light (470 nm). A systematic study of the main operating variables (oxidant and catalyst concentration and irradiance) was accomplished to investigate their influence in the abatement of 124-TCB in water. The reaction was carried out in a well-mixed reactor of glass irradiated by a visible LED light. The hydrogen peroxide concentration was tested from 0 to 18 mM, the goethite concentration within the range 0.1–1.0 g·L−1 and the irradiance from 0.10 to 0.24 W·cm−2 at neutral pH. It was found that this oxidation method is a very efficient technique to abate 124-TCB, reaching a pollutant conversion of 0.9 when using 0.1 g·L−1 of goethite, 18 mM of H2O2, and 0.24 of W·cm−2. Moreover, the system performance was evaluated using the photonic efficiency (ratio of the moles of 124-TCB abated and the moles of photons arriving at the reactor window). The maximum photonic efficiencies were obtained using the lowest lamp powers and moderate to high catalyst loads.

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Pharmaceuticals, benzene, toluene and chlorobenzene removal from contaminated groundwater by combined UV/H 2 O 2 photo-oxidation and aeration

Cited by 50 publications

References 18 publications

An electrochemical advanced oxidation process for the treatment of urban stormwater

An electrochemical advanced oxidation process for the treatment of urban stormwater

Removal of Pharmaceuticals from Water by Adsorption and Advanced Oxidation Processes: State of the Art and Trends

Abatement of 1,2,4-Trichlorobencene by Wet Peroxide Oxidation Catalysed by Goethite and Enhanced by Visible LED Light at Neutral pH

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