Optimization of an electrocoagulation-flotation system for domestic wastewater treatment and reuse
| Autor: | Gustavo Holz Bracher, Cristiane Graepin, Andressa Paola Hubner, Elvis Carissimi, Delmira Beatriz Wolff |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Pollution
Sanitation media_common.quotation_subject medicine.medical_treatment 0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences Reuse Wastewater 01 natural sciences Waste Disposal Fluid Electrocoagulation Water Purification Wastewater disposal Scarcity medicine Environmental Chemistry Waste Management and Disposal Electrodes 0105 earth and related environmental sciences Water Science and Technology media_common Waste management General Medicine 020801 environmental engineering Research Design Environmental science Sewage treatment Brazil |
| Zdroj: | Environmental technology. 42(17) |
| ISSN: | 1479-487X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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