Degradation of chlorophenoxy herbicides by coupled Fenton and biological oxidation

Sanchis, S.; Polo, A.M.; Tobajas, Montserrat; Rodrı́guez, Juan J.; Mohedano, A.F.

doi:10.1016/j.chemosphere.2013.04.097

Cited by 58 publications

(27 citation statements)

References 42 publications

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“…1, 2, 3 and 5 in Table , which were all identified in the Fenton‐like oxidation effluents obtained with the 25% dose). This result is consistent with previous findings in the Fenton oxidation of pesticides including increased formation of carboxylic acids with increase in the H 2 O 2 dose and a gradual reduction of ecotoxicity to nonecotoxic levels in the effluent treated with the stoichiometric dose. Based on these results, the Fenton‐like effluents obtained with the 50% and 75% doses were subjected to further biological treatment in order to completely remove TMX, reduce ecotoxicity and increase biodegradability to an acceptable level.…”

Section: Resultssupporting

confidence: 93%

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Thiamethoxam removal by Fenton and biological oxidation

Gomez‐Herrero

Lebik-Elhadi

Aït-Amar

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Thiamethoxam (TMX) is a potential insecticide pollutant of hydric resources that must be removed. Advanced oxidation processes (AOPs) are usually effective, but expensive to implement. Combining Fenton's reagent with biological oxidation circumvents the shortcomings of Fenton technology, facilitating the biodegradation of the resulting effluents in a sequencing batch reactor (SBR). RESULTS Fenton‐like oxidation of TMX with variable hydrogen peroxide (H2O2) doses afforded total organic carbon (TOC) conversion and chemical oxygen demand (COD) removal by (respectively) 40% and 80% from pure TMX, and 40% and 60% from commercial TMX. The effluents from Fenton oxidation using substoichiometric H2O2 doses were less ecotoxic and more biodegradable than the initial solution and, therefore, susceptible to a biological treatment. Biological oxidation of effluents obtained from 50% and 75% H2O2 doses was accomplished for different organic loads in 6‐h cycles. Coupling Fenton and biological oxidation of TMX afforded TOC conversion and COD removal of 80% for the effluent obtained with a 75% H2O2 dose. CONCLUSIONS Coupling Fenton–biological oxidation efficiently reduces the amounts of H2O2 needed and produces biodegradable effluents. In addition, the biological treatment increases COD and TOC removal by ≤80% for the overall treatment. © 2019 Society of Chemical Industry

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Section: Resultssupporting

confidence: 93%

“…Combinations of chemical and biological oxidation also have been used with other pesticides such as alachlor, atrazine and diuron. All were fully depleted by Fenton oxidation, the resulting effluents being more biodegradable in the subsequent biological treatment …”

Section: Resultsmentioning

confidence: 99%

Thiamethoxam removal by Fenton and biological oxidation

Gomez‐Herrero

Lebik-Elhadi

Aït-Amar

et al. 2019

J of Chemical Tech & Biotech

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“…[2]. It Many AOPs have been applied to 2,4-D removal including Fenton's reaction [4,5], photo-Fenton [6,7], UV/H 2 O 2 processes [8,9], UV/TiO 2 [10,11], VUV [12], ozonation [13,14] and catalysed ozonation [15,16].…”

Section: Introductionmentioning

confidence: 99%

Development of a kinetic model for the UV/H2O2 photodegradation of 2,4-dichlorophenoxiacetic acid

Murcia¹,

Vershinin²,

Briantceva³

et al. 2015

Chemical Engineering Journal

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“…Their presence in waters may result in various, direct or indirect, toxicological effects on the environment and on human health. Due to their resistance to microbial degradation [1,2], a major future challenge in wastewater and drinking water treatment is to improve existing unit processes and to design new ones to remove these organic pollutants from a broad range of water matrices [3].…”

Section: Introductionmentioning

confidence: 99%