Removal of Emerging Contaminants by Fenton and UV-Driven Advanced Oxidation Processes

Lucas, Marco S.; Peres, José A.

doi:10.1007/s11270-015-2534-z

Cited by 26 publications

(6 citation statements)

References 21 publications

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“…It can be concluded from Figure 4 that pH values increase (up to 7.01) during biological d-COD degradation. This is consistent with the observations of Moreira et al [37] and Lucas et al [62], the latter stating that "this happens due to the adaptation and type of microorganisms naturally occurring along time, which clearly prefer higher pH values". According to Litaor et al [63] a decrease in dissolved organic compounds is accompanied by an increase of dissolved inorganic carbon (during the oxidation of organic matter, CO 2 is released) that result in an increase of pH to more alkaline values.…”

Section: Appl Sci 2020 10 X For Peer Review 8 Of 14supporting

confidence: 92%

Biotreatment of Winery Wastewater Using a Hybrid System Combining Biological Trickling Filters and Constructed Wetlands

2020

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The objective of this work was to determine the ability of a pilot-scale hybrid system to treat real (non-synthetic) winery wastewater. The experimental treatment system consisted of two stages: An attached growth pilot-scale bioreactor (biological trickling filter with plastic support material) was initially used to remove a significant amount of dissolved chemical oxygen demand (d-COD) from winery wastewater, and then a pilot-scale, horizontal subsurface flow constructed wetland (CW) was examined as a post-treatment step for further d-COD removal. Results from the biofilter revealed that the recirculation rate of 1.0 L/min lead to higher d-COD removal rates than that of 0.5 L/min for all feed d-COD concentrations tested (3500, 7500, 9000 and 18,000 mg d-COD/L). Experiments in the CW were performed using feed d-COD concentrations of about 1500 mg/L (equivalent to biofilter effluent when initial filter feed d-COD concentrations are 18,000 mg/L). The wetland polishing stage managed to further remove d-COD and produced effluent concentrations below current legislation limits for safe disposal. Furthermore, the presence of zeolite in CW (one third of the length of CW) enhanced ammonium removal. The experimental results indicate that the combination of a biological trickling filter and a constructed wetland could effectively treat effluents originating from small wineries typical of the Mediterranean region.

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Section: Appl Sci 2020 10 X For Peer Review 8 Of 14supporting

confidence: 92%

Biotreatment of Winery Wastewater Using a Hybrid System Combining Biological Trickling Filters and Constructed Wetlands

2020

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“…Fenton reactions are widely used in advanced oxidation processes to decompose hydrocarbons, 65 natural organic matter, 119 and emerging contaminants. 120 In the Fenton reaction, hydroxyl radicals (OH • ) are generated via reaction between ferrous iron and hydrogen peroxide. [62][63][64]121 The hydroxyl radicals generated via the Fenton reaction can degrade more than 90% of PAM with initial MW of 5.2 × 10 6 Da at a concentration of 5000 mg/L.…”

Section: Fig 3 Hydrolysis Of Pam Generating a Carboxylic Acid Group mentioning

confidence: 99%

Polyacrylamide degradation and its implications in environmental systems

et al. 2018

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High molecular weight (10 6-3 × 10 7 Da) polyacrylamide (PAM) is commonly used as a flocculant in water and wastewater treatment, as a soil conditioner, and as a viscosity modifier and friction reducer in both enhanced oil recovery and high volume hydraulic fracturing. These applications of PAM can result in significant environmental challenges, both in water management and in contamination of local water supplies after accidental spills. This paper provides a short review of current applications of high molecular weight PAM, including the potential for PAM degradation by chemical, mechanical, thermal, photolytic, and biological processes. Methods for treating wastewater containing partially degraded PAM are then discussed along with issues related to the potential toxicity and mobility of PAM in the environment after disposal or accidental release.

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“…To date, only two studies have reported the electrochemical degradation of MeP in sulfate medium, focusing on its conversion to various by-products in EO with BDD at very low j [47,48]. Previous research also assessed the treatment of MeP by conventional Fenton and UV-driven AOPs [49]. However, Fenton process was inefficient for MeP degradation, whereas UV-based methods like photo-Fenton yielded better but still partial conversion values.…”

Section: Introductionmentioning

confidence: 99%

On the selection of the anode material for the electrochemical removal of methylparaben from different aqueous media

Steter

Brillas

Sirés

2016

Electrochimica Acta

105

109

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Parabens are widely used industrial preservatives, routinely found in wastewater along with major inorganic ions like sulfate and chloride. This work investigates the oxidation ability of three electrochemical processes in tank reactors equipped with an air-diffusion cathode to electrogenerate H2O2 on site, namely electro-oxidation (EO-H2O2), electro-Fenton (EF) and UVA photoelectro-Fenton (PEF), to degrade aqueous solutions of methylparaben (MeP) at pH 3.0. Their performance using boron-doped diamond (BDD), Pt or two kinds of dimensionally stable anodes (DSA ® ) has been compared from the analysis of mineralization profiles and decay kinetics in the presence of sulfate and/or chloride ions. The use of BDD ensured the overall mineralization in all three processes according to the sequence: PEF > EF > EO-H2O2, thanks to the contribution of BDD( • OH), • OH and UVA light. Pt and DSA ® became an interesting alternative in PEF, with slower organic matter removal but similar final mineralization percentages, being much less powerful than BDD in EO-H2O2. The presence of Cl − was beneficial in the latter process, due to the formation of active chlorine as an additional oxidant that caused a much faster decay of MeP.Conversely, it became significantly detrimental in EF due to the partial destruction of H2O2 and• OH in the bulk by active chlorine and Cl − , respectively. The oxidation power of PEF was so high that similar fast, complex decay kinetics was found in all media regardless of the anode, although the mineralization was decelerated owing to the accumulation of chlorinated by-products. GC-MS and HPLC analysis allowed the identification of up to seven aromatic MeP derivatives in sulfate + chloride mixtures, including three non-chlorinated compounds also found in pure sulfate medium. These molecules were gradually transformed into oxalic acid, along with four chlorinated aliphatic carboxylic acids in Cl − -containing media.

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Removal of Emerging Contaminants by Fenton and UV-Driven Advanced Oxidation Processes

Cited by 26 publications

References 21 publications

Biotreatment of Winery Wastewater Using a Hybrid System Combining Biological Trickling Filters and Constructed Wetlands

Biotreatment of Winery Wastewater Using a Hybrid System Combining Biological Trickling Filters and Constructed Wetlands

Polyacrylamide degradation and its implications in environmental systems

On the selection of the anode material for the electrochemical removal of methylparaben from different aqueous media

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