Advanced Oxidation Processes for Wastewater Treatment in the Pulp and Paper Industry: A Review

Covinich, Laura Gabriela; Bengoechea, Dora Inés; Fenoglio, Rosa Juana; Área, María Cristina

doi:10.5923/j.ajee.20140403.03

Cited by 76 publications

(36 citation statements)

References 141 publications

(136 reference statements)

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“…A set of experiments were carried out at 70 °C to analyze the relationship between the system pH and the adsorption of organic compounds over γ-Al 2 O 3 (see Table 4). Trials were made as a function of the point of zero charge (PZC) of γ-Al 2 O 3 (7)(8)(9), corresponding to the pH at which its surface is neutral [57], [58]. The pH of the experiments was controlled by adding H 2 SO 4 or NaOH to the reaction volume; since γ-Al 2 O 3 tends to dissolve in strong systems (either acidic or basic), these trials were performed within a pH range that was kept between 3 and 10.…”

Section: Estimation Of Toc Reduction By Adsorptionmentioning

confidence: 99%

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Kinetic modeling of a heterogeneous Fenton-type oxidative treatment of complex industrial effluent

et al. 2018

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This work proposes a kinetic model for the reactions involved in the heterogeneous copper-based Fenton-type oxidation of mixed recalcitrant compounds in a real industrial effluent from the alkaline sulfite treatment of wood. This kind of treatment is unusual in this industry due to the complexity of the effluents and the high costs involved in total mineralization of the organic matter. Nevertheless, conversion of recalcitrant to degradable compounds and catalyst recovery can make the difference. The complexity of the effluent and the great number of compounds formed as intermediates, make extremely difficult the identification and quantification of the individual reactions that occur during oxidation. To solve this drawback TOC parameter was used as a representative measurement. To verify the level of TOC degradation produced by the heterogeneous catalysis reaction, experiences of homogeneous catalysis and adsorption were accomplished. The studied temperature range was 45-80 °C. A "two-step" kinetic model was applied to TOC reduction in heterogeneous and homogeneous oxidations, admitting two sequential steps of oxidation: a first fast stage ("seconds stage") followed by a slow one ("minutes stages"). Kinetic constants were obtained for both processes and activation energies were also determined for the "minutes stage" step (33.17 kJ/mol and 15.13 kJ/mol, respectively). Homogeneous catalysis studies confirm mass transfer limitations in heterogeneous oxidations. Experiences of adsorption of organic matter on CuO/γ-Al 2 O 3 catalyst demonstrated that this phenomenon is exothermic and cannot be neglected. The activation energy of adsorption was determined as 7.32 kJ/mol. Catalysts were characterized through SEM, EDS, XRD, FTIR, and TGA. Graphical Abstract

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Section: Estimation Of Toc Reduction By Adsorptionmentioning

confidence: 99%

“…These processes differ from each other in the source of radicals HO·, which is their main feature. Hydroxyl radicals (HO·) present high reactivity and low selectivity during oxidation [1], [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Kinetic modeling of a heterogeneous Fenton-type oxidative treatment of complex industrial effluent

et al. 2018

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“…The hydroxyl radicals may be produced by means of various chemical, photochemical, sonochemical or electrochemical reactions [6]. Among these methods, the photochemical processes, especially heterogeneous photocatalytic process involving semiconductors and ultraviolet (UV) irradiation, such as TiO 2 /UV, Fe 2 O 3 -TiO 2 /UV, ZnO/UV, ZnO/O 2 /UV and TiO 2 /H 2 O 2 /UV, have attracted significant attention in the degradation of lignin [7][8][9][10]. Wide band gap semiconductors, such as TiO 2 and ZnO, are employed due to their high valence band potentials.…”

Section: Introductionmentioning

confidence: 99%

Thermally-assisted photodegradation of lignin by TiO2/H2O2 under visible/near-infrared light irradiation

Liu

2017

Sci. China Mater.

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As a bio-recalcitrant organic pollutant in paper mill effluent, lignin is generally removed by an advanced oxidation process, such as a TiO 2 /H 2 O 2 photocatalytic technique under irradiation with ultraviolet light, which only accounts for less than 5% of sunlight. Herein, we reported a TiO 2 /H 2 O 2 -based thermally-assisted photocatalytic process that allows lignin to be efficiently degraded under visible/ near-infrared light at an elevated temperature. Adsorption of H 2 O 2 on TiO 2 nanoparticles and an increase of temperature facilitate the production and separation of charge carriers under near-infrared and visible light irradiation, accelerate carrier transfer at the TiO 2 -electrolyte interface and promote the production of hydroxyl radicals. A higher level of H 2 O 2 addition results in an increased degradation rate of lignin, while the optimal temperature for the thermally-assisted photodegradation of lignin is 70°C. A charge carrier excitation and transfer process was proposed for the TiO 2 /H 2 O 2 thermally-assisted photocatalytic process. This work describes a new method for the photodegradation of organic pollutants, such as residual lignin in paper mill effluent, using wide band gap semiconductors under visible and near-infrared light irradiation.

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“…These processes combine several oxidants and/or physical treatments, such as ultraviolet light and ultrasonic irradiation with or without the use of chemical catalysts. AOPs are based on the formation of hydroxyl radicals ( • OH), which promote radical chain reactions leading to the destruction of aromatic compounds, adsorbable organic halogen (AOX), detergents, pesticides, azo dyes, and phenols [5,6,12,[14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…In the past, chemical oxidation has been used for reducing the concentrations of residual organics, removing ammonia, controlling odors, and for disinfection purposes. Nowadays, chemical oxidation processes are recommended for improving the biological treatability of refractory organic compounds and reducing the inhibitory effects of specific substances towards the microbial growth [12,13].…”

Section: Introductionmentioning

confidence: 99%

H2O2 Based Oxidation Processes for the Treatment of Real High Strength Aqueous Wastes

et al. 2017

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This work was aimed at studying the applicability of H 2 O 2 -based oxidation processes (namely H 2 O 2 /UV, photo-Fenton, and Fenton) for the treatment of six real aqueous wastes. These wastes derived from chemical, pharmaceutical, and detergent production, and were characterised by high COD (chemical oxygen demand) and, in four cases, surfactant concentrations: overall, about 100 tests were conducted. The H 2 O 2 /UV and photo-Fenton processes proved to be very effective in COD removal, the efficiency being greater than 70%. The optimal treatment conditions for the H 2 O 2 /UV process were: 120 min reaction, H 2 O 2 /COD initial dosage ratio = 1/2; the radiation intensity (up to 2000 W·L −1 ) revealed to be a crucial factor, especially in the earlier stage of the process (about 40 min): this aspect can be exploited to reduce the costs related to energy consumption. For the photo-Fenton process the following conditions were chosen: Fe 2+ /H 2 O 2 ratio = 1/30; specific power input = 125 W·L −1 ; H 2 O 2 /COD initial = 1/2; reaction time = 240 min. Photolytic reactions and the presence of dissolved oxygen revealed to be crucial factors for COD removal. The Fenton process, while showing a moderate efficiency (25% COD removal) in the treatment of high loaded wastewaters, provided excellent results in the treatment of aqueous wastes with high content of surfactants. An average yield removal of 70% for non-ionic surfactants (TAS) and 95% for anionic surfactants (MBAS) was obtained, under the following optimal conditions: Fe 2+ /H 2 O 2 = 1/4, H 2 O 2 /COD initial ratio = 1, and contact time = 30 min.

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Advanced Oxidation Processes for Wastewater Treatment in the Pulp and Paper Industry: A Review

Cited by 76 publications

References 141 publications

Kinetic modeling of a heterogeneous Fenton-type oxidative treatment of complex industrial effluent

Kinetic modeling of a heterogeneous Fenton-type oxidative treatment of complex industrial effluent

Thermally-assisted photodegradation of lignin by TiO2/H2O2 under visible/near-infrared light irradiation

H2O2 Based Oxidation Processes for the Treatment of Real High Strength Aqueous Wastes

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