Decontamination of real urban sewage—comparison between Fenton and electrochemical oxidation

Decontamination of real urban sewage—comparison between Fenton and electrochemical oxidation

Advanced oxidation processes have been used for wastewater treatment due to their capacity to reduce the organic loading and for their fast reactions. In this paper, we explore the viability of isolated and sequential use of electrochemical oxidation and Fenton processes into treatment of real raw u...

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Bibliographic Details
Published in:Environmental science and pollution research international Vol. 29; no. 23; pp. 35061 - 35072
Main Authors: de Araújo, Jenivaldo L., da Silva, Jaceguai S., Santos, Fábio A. S., de Carvalho, Cenira M., Duarte, José Leandro S., Tonholo, Josealdo, Zanta, Carmem L. P. S.
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-05-2022
Springer Nature B.V
Subjects:
Ammonia
Aquatic Pollution
Artemia
Atmospheric Protection/Air Quality Control/Air Pollution
Bioassays
Chemical oxygen demand
Chemical treatment
Chloride ions
Chlorine
Decontamination
Earth and Environmental Science
Ecotoxicology
Electrochemical oxidation
Electrochemistry
Energy consumption
Environment
Environmental Chemistry
Environmental Health
Environmental science
Hydrogen peroxide
Iron
Organic loading
Organic matter
Oxidation
Research Article
Sewage
Toxicity
Turbidity
Waste Water Technology
Wastewater treatment
Water Management
Water Pollution Control
Fenton
Real water treatment
Urban sewage
Toxicity
Electro-oxidation
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Summary:Advanced oxidation processes have been used for wastewater treatment due to their capacity to reduce the organic loading and for their fast reactions. In this paper, we explore the viability of isolated and sequential use of electrochemical oxidation and Fenton processes into treatment of real raw urban sewage. The electrochemical process was carried out using DSA®-Cl 2 electrodes and factorial planning in order to investigate the influence of pH, current density, and electrolyte. Fenton reaction was also used and H 2 O 2 and Fe 2+ concentration effects were investigated. The efficiency was estimated by chemical oxygen demand (COD) removal and in the optimized conditions the effluent was characterized by turbidity, suspended/dissolved/total solids, ammonia, chloride ions, free chlorine, nitrite, and potassium analysis and bioassays with Artemia ssp. and Lactuca sativa . The study demonstrated that the use of electrochemical technique followed by Fenton allowed an improvement in the degradation of organic matter and reduction of turbidity and solid content, reaching reductions of 86.8, 96.4, 99.4, 56.1, and 66.7% for COD, turbidity, SS, DS, and TS, respectively. The associated treatment also contributed to the reduction of energy consumption by 74.9%, from the 23.9 kWh m −3 observed during the electrochemical treatment isolated to the 6 kWh m −3 during the associated process. All the treatments presented toxicity reduction, with the electrochemical process achieving the best results. Graphical abstract
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content type line 23
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-022-18718-w