Process optimization using a kinetic model for the ultraviolet radiation-hydrogen peroxide decomposition of natural and synthetic organic compounds in groundwater

Song, Wonho; Ravindran, Varadarajan; Pirbazari, Massoud

doi:10.1016/j.ces.2008.03.024

Cited by 65 publications

(67 citation statements)

References 45 publications

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“…These mechanistic models are based on known chemical and photochemical principles and can help understanding the often complex chemical mechanisms. They can be of great value during the design and engineering process [16][17][18][19][20][21][22][23][24]. For this reason, the model discussed in this paper belongs to this group.…”

Section: Omentioning

confidence: 99%

“…This is mainly due to hydroxyl radical attack at reactive double bond sites, which often occurs at a speed which is not proportional to the TOC or DOC reduction. For these reasons, Song et al [21] used the decadic UV absorption at coefficient at 310 nm (UVA 310 ) as a NOM surrogate (the decadic absorption coefficient is defined as the absorbance divided by the optical path length of the solution [28]). Indeed, only an insignificant TOC reduction during the first 10 minutes of UV/H 2 O 2 treatment at H 2 O 2 concentrations ranging between 2 and 6 mM was demonstrated.…”

Section: Uv Absorption As Nom Surrogatementioning

confidence: 99%

See 1 more Smart Citation

Application of a mechanistic UV/hydrogen peroxide model at full-scale: Sensitivity analysis, calibration and performance evaluation

Audenaert

Vermeersch

Hulle

et al. 2011

Chemical Engineering Journal

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Numerous mechanistic models describing the UV/H 2 O 2 process have been proposed in literature. In this study, one of them was used to predict the behavior of a full-scale reactor. The model was calibrated and validated with nonsynthetic influent using different operational conditions. A local sensitivity analysis was conducted to determine the most important operational and chemical model parameters. Based on the latter, the incident UV irradiation intensity and two kinetic rate constants were selected for mathematical estimation. In order to investigate changes of the NOM content over time, some time delay was considered between calibration and validation data collection. Hydrogen peroxide concentration, the decadic absorption coefficient at 310 nm (UVA 310 , as a surrogate for natural organic matter) and pH could be satisfactorily predicted during model validation using an independent data set. It was demonstrated that quick real-time calibration is an option at less controllable full-scale conditions. The reactivity of UVA 310 towards hydroxyl radicals did not show significant variations over time suggesting no need for frequent recalibration. Parameters that determine the initiation step, i.e. photolysis of hydrogen peroxide, have a large impact on most of the variables. Some reaction rate constants were also of importance, but nine kinetic constants did show absolutely no influence to one of the variables. Parameters related to UV shielding by NOM were of main importance. At the conditions used in this study, i.e. H 2 O 2 concentrations between 0.5 and 4 mM, hydraulic residence times between 90 and 200 s and alkalinity concentrations between 2.5 and 6 mM, competitive radiation absorption by NOM was more detrimental to the micro pollutant removal efficiency than hydroxyl radical scavenging. Hydrogen peroxide concentration was classified as a non-sensitive variable, in contrast to the concentration of a micro pollutant which showed to be very to extremely influential to many of the parameters. UV absorption as a NOM surrogate is a promising variable to be included in future models. Model extension by splitting up the UVA 310

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Section: Omentioning

confidence: 99%

Section: Uv Absorption As Nom Surrogatementioning

confidence: 99%

Application of a mechanistic UV/hydrogen peroxide model at full-scale: Sensitivity analysis, calibration and performance evaluation

Audenaert

Vermeersch

Hulle

et al. 2011

Chemical Engineering Journal

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“…Direct ozone decomposition is modeled assuming that ozone follows a first order decay with a rate constant of 0.000485 s -1 [11]. UV absorbance (optical density) at 254nm was used as a surrogate for the amount of organic material that reacts with ozone [11,24]. However, it has to be highlighted that this parameter represents a part of the organic pollution concentration as it specifically gives a measure of the amount of aromatic and unsaturated compounds in water [25].…”

Section: 3modelling Approachmentioning

confidence: 99%

Full-scale modelling of an ozone reactor for drinking water treatment

Audenaert

Callewaert

Cromphout³

et al. 2010

Chemical Engineering Journal

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In 2003, the Flemish Water Supply Company (VMW) extended its drinking water production site in Kluizen (near Ghent, Belgium) with a combined ozonation and biological granular activated carbon filtration (BGAC) process. Due to this upgrade, biostability increased, less chlorination was needed and drinking water quality improved significantly. The aim of this study was to describe the full-scale reactor with a limited set of equations. In order to describe the ozonation process, a model including key processes such as ozone decomposition, organic carbon removal, disinfection and bromate formation was developed. Kinetics were implemented in WEST ® and simulation results were compared to real data. The predicting performance was verified with a goodness of fit test and key parameters were determined through a local sensitivity analysis. Parameters involving optical density (both rate constants and stoichiometric coefficients) strongly affect model output Some parameters with respect to bromate and bacteria showed to be only, but to a large extent, sensitive to their associated concentrations. A scenario analysis was performed to study the system's behavior at different operational conditions. It was demonstrated that the model is able to describe the operation of the full-scale ozone reactor, however, further data collection for model validation is necessary.

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“…Since most waters naturally contain these scavengers, optimiza-tion of AOPs must be performed taking these species into account. The prediction of the effect of all these scavengers on the process efficiency is difficult due to their different reactivity, as well as due to the constant variations in the liquid phase when the parent pollutants are continuously transformed into many different by-products (Pera-Titus et al, 2004;Song et al, 2008). AOPs include a series of powerful technologies to treat water, and they can implement ultraviolet (UV) radiation, ozone (O3), hydrogen peroxide (H2O2), and oxygen (O2), among others.…”

Section: Advanced Oxidation Processes (Aops): Concept and Fundamentalsmentioning

confidence: 99%

“…Alachlor is often used as a model compound in studies dealing with AOPs due to its trend to form complexes with organic matter and its classification as an endocrine disrupting compound, EDC (Song et al, 2008).…”

Section: Pesticidesmentioning

confidence: 99%

An overview on the advanced oxidation processes applied for the treatment of water pollutants defined in the recently launched Directive 2013/39/EU

Ribeiro

Nunes

Pereira

et al. 2015

Environment International

806

319

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Environmental pollution is a recognized issue of major concern since a wide range of contaminants has been found in aquatic environment at ng L −1 to μg L −1 levels.In the year 2000, a strategy was defined to identify the priority substances concerning aquatic ecosystems, followed by the definition of environmental quality standards (EQS) in 2008. Recently it was launched the Directive 2013/39/EU that updates the water framework policy highlighting the need to develop new water treatment technologies to deal with such problem. This review summarizes the data published in the last decade regarding the application of advanced oxidation processes (AOPs) to treat priority compounds and certain other pollutants defined in this Directive, excluding the inorganic species (cadmium, lead, mercury, nickel and their derivatives).The Directive 2013/39/EU includes several pesticides

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Process optimization using a kinetic model for the ultraviolet radiation-hydrogen peroxide decomposition of natural and synthetic organic compounds in groundwater

Cited by 65 publications

References 45 publications

Application of a mechanistic UV/hydrogen peroxide model at full-scale: Sensitivity analysis, calibration and performance evaluation

Application of a mechanistic UV/hydrogen peroxide model at full-scale: Sensitivity analysis, calibration and performance evaluation

Full-scale modelling of an ozone reactor for drinking water treatment

An overview on the advanced oxidation processes applied for the treatment of water pollutants defined in the recently launched Directive 2013/39/EU

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