Optimization of an electrocoagulation-flotation system for domestic wastewater treatment and reuse

Optimization of an electrocoagulation-flotation system for domestic wastewater treatment and reuse

The risks inherent to the inadequate domestic wastewater disposal, allied to the water growing demand, scarcity, and pollution problems, have highlighted the importance of adopting treatment techniques that not only target the sewage discharge, but also its reuse. For this reason, the objective of t...

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Bibliographic Details
Published in:Environmental technology Vol. 42; no. 17; pp. 2669 - 2679
Main Authors: Bracher, Gustavo Holz, Carissimi, Elvis, Wolff, Delmira Beatriz, Graepin, Cristiane, Hubner, Andressa Paola
Format: Journal Article
Language:English
Published: England Taylor & Francis 29-07-2021
Taylor & Francis Ltd
Subjects:
Agitation
Aluminum
domestic sewage
Domestic wastewater
Electric currents
electrochemical process
Electrocoagulation
Electrodes
Electrolysis
Flotation
Optimization
pH effects
Sanitation
Sewage
Turbidity
urban reuse
Wastewater disposal
Wastewater reuse
Wastewater treatment
Water scarcity
Water treatment
domestic sewage
electrochemical process
urban reuse
Sanitation
wastewater treatment
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Summary:The risks inherent to the inadequate domestic wastewater disposal, allied to the water growing demand, scarcity, and pollution problems, have highlighted the importance of adopting treatment techniques that not only target the sewage discharge, but also its reuse. For this reason, the objective of this study was to evaluate the best conditions of an electrocoagulation-flotation system for domestic wastewater treatment and urban reuse. To achieve this, an effects study followed by two rotatable central composite experimental designs 2² was performed, considering: agitation, electrical current, electrolysis time, inter-electrodes distance, and initial pH. The electrocoagulation-flotation system was composed of a cylindrical acrylic reactor with a working volume of 1 L, with two aluminium electrodes connected to a direct-current power supply. Results showed that electrical current and electrolysis time were the most influent operational parameters on domestic wastewater treatment in the electrocoagulation-flotation system. The initial pH adjustment was also important due the pH increase tendency observed in the results. The best conditions of agitation, inter-electrodes distance, electrolysis time, electrical current, and initial pH for domestic wastewater treatment and urban reuse were 262.5 rpm, 1 cm, 25 min, 1.65 A, and 6, respectively. Under these conditions, turbidity and colour removals higher than 98% and 92% were reached respectively, as well as residual turbidity lower than 6 NTU and final pH of 8 were achieved, following the Brazilian standards and guidelines for urban reuse. Thus, the electrocoagulation-flotation system studied was effective for domestic wastewater treatment and reuse for urban supply purposes.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2019.1709905