Evaluating UV/H2O2 processes for methyl tert-butyl ether and tertiary butyl alcohol removal: Effect of pretreatment options and light sources

Li, Ke; Hokanson, David R.; Crittenden, John C.; Trussell, R. Rhodes; Minakata, Daisuke

doi:10.1016/j.watres.2008.09.017

Cited by 55 publications

(37 citation statements)

References 17 publications

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“…In the absence of H 2 O 2 , direct photolysis of the dye (dye + h → products) was slow and resulted in less than 10% azo bond degradation in 60 min which was in agreement with the literature [12]. However, generation of a non-selective and powerful oxidant, • OH radicals [28,29] by direct photolysis of added hydrogen peroxide (H 2 O 2 + h → 2 • OH) significantly enhanced the degradation of the dye, since complete decolorization (dye + • OH → products) was obtained in less than Because of the low molar absorptivity of H 2 O 2 at 254 nm (18.6-19.6 l/mol cm) [30], theoretically an excess of H 2 O 2 is needed to produce more • OH radicals. However in our previous work [31], in addition to other reports [32,33], we observed that the concentration of H 2 O 2 may either enhance or inhibit the photoreaction rate depending on concentration.…”

Section: Effect Of H 2 Omentioning

confidence: 99%

Decolorization of Mordant red 73 azo dye in water using H2O2/UV and photo-Fenton treatment

Elmorsi

Riyad

Mohamed

et al. 2010

Journal of Hazardous Materials

203

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Section: Effect Of H 2 Omentioning

confidence: 99%

Decolorization of Mordant red 73 azo dye in water using H2O2/UV and photo-Fenton treatment

Elmorsi

Riyad

Mohamed

et al. 2010

Journal of Hazardous Materials

203

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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%

“…Further, the effects of NOM could be included although this was not verified as no new experiments were carried out. A useful application of this model was the optimization and dimensioning of a full-scale UV/H 2 O 2 reactor [23]. Sharpless and Linden [20] investigated NNitrosodimethylamine (NDMA) removal with low-pressure (LP) and medium-pressure (MP) UV lamps.…”

Section: Kinetic Model Applicationsmentioning

confidence: 99%

“…Total organic carbon (TOC) and DOC, expressed in mg (or mole) carbon L -1 , are frequently used surrogates for (natural) organic matter [20,22,23,25]. These variables can be easily determined and cover all organic compounds present in the water.…”

Section: Uv Absorption As Nom Surrogatementioning

confidence: 99%

“…Sharpless and Linden [20] estimated the attenuation caused only by the quartz sleeve at 10%. Li et al [23] took into account a UV irradiation decrease of 30% caused by scaling and lamp aging. Probably, sleeve absorption, (irreversible) scaling and lamp aging all contributed to a lower incident UV irradiation.…”

Section: Figure 3: Measured and Calculated E(t') Curves At A Flow Ratmentioning

confidence: 99%

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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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Removal of MTBE in biological activated carbon adsorbers

Huang

et al. 2012

Env Prog and Sustain Energy

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Methyl tert‐butyl ether (MTBE) is a common gasoline additive; it has become a groundwater pollutant in many countries. Granular activated carbon (GAC) adsorption treatment is not cost‐effective for removing MTBE because it is not well adsorbed. Acclimated MTBE degraders actively growing in the GAC adsorber will make it a biological activated carbon (BAC) system capable of long‐term MTBE removal without periodic GAC replacement. The conventional inoculation method of circulating a seeding solution of the MTBE degraders present in the spent GAC sample from a BAC system of a southern California MTBE remediation site failed to initiate the BAC function in treating a high MTBE influent (30 mg/L, simulating a newly contaminated groundwater); the effluent samples of inoculated coal and coconut GAC columns were nearly the same as those of the non‐inoculated columns. After a start‐up period of less than two months, the small GAC columns filled with new coconut GAC on top of the MTBE degrader containing spent GAC became effective BAC systems accomplishing more than 40% of MTBE removal from the high concentration (30 mg/L) influent and more than 80% of removal from the low concentration (1 mg/L) influent. When MTBE concentration of the influent declined steadily, the BAC capability prevented the sudden rise of MTBE in the effluent. A small dose of hydrogen peroxide provided the essential dissolved oxygen to sustain aerobic degradation of MTBE in the BAC; adding peroxide to the influents of two serial adsorbers is more efficient in treating newly contaminated groundwater. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 239‐248, 2013

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Evaluating UV/H2O2 processes for methyl tert-butyl ether and tertiary butyl alcohol removal: Effect of pretreatment options and light sources

Cited by 55 publications

References 17 publications

Decolorization of Mordant red 73 azo dye in water using H2O2/UV and photo-Fenton treatment

Decolorization of Mordant red 73 azo dye in water using H2O2/UV and photo-Fenton treatment

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

Removal of MTBE in biological activated carbon adsorbers

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