Textile effluent treatment using coagulation-flocculation and a hydrodynamic cavitation reactor associated with ozonation

Author(s)

Marques, Diego Gouveia ; Domingos, Janaina de Melo Franco ; Nolasco, Marcelo Antunes ; Campos, Valquiria

• Document type: Journal article
• Source: Chemical Engineering Science; v. 304, p. 12-pg., 2024-12-17.

Abstract

Textile effluent is a highly toxic wastewater that resists conventional treatments, requiring advanced technologies for the effective removal of pollutants. A promising solution involves combining processes like coagulationflocculation and hydrodynamic cavitation with ozone. Coagulation-flocculation, a low-cost method, enhances the effectiveness of subsequent treatments. Hydrodynamic cavitation paired with ozone is described as a synergetic oxidation process that facilitates pollutant removal and mitigates ozone-related limitations. In this study, the combination of coagulation-flocculation and hydrodynamic cavitation with ozone was evaluated. Alone, two hours of cavitation and ozone removed 45 % of apparent color and 56 % of COD, which was insufficient. Coagulation-flocculation with 700 mg L- 1 of PACl yielded high pollutant removal but generated significant sludge. Using 550 mg L- 1 of PG alpha 21Ca followed by hydrodynamic cavitation and ozone achieved 94 % color, 97 % turbidity, and 84 % COD removal, meeting Brazilian disposal standards, with 86 % less sludge than PACl, highlighting its technical efficacy and potential environmental advantages. (AU)

• FAPESP's process: 23/12713-3 - NanoSAP and MOF hydrocell system to generate and capture atmospheric water
• Grantee: Valquiria de Campos
• Support Opportunities: Regular Research Grants
• FAPESP's process: 15/02650-8 - Production and environmental application of y-polyglutamic acid by cultivation of B. subtilis in soy substrate
• Grantee: Valquiria de Campos
• Support Opportunities: Regular Research Grants