A dual perspective (Conven-tional and solar-enhanced) on advanced oxidation processes for the treatment of Agave Cocui vinasses

Abstract:

Agave cocui vinasse was physicochemically characterized with reference to the relevant environmental regulations. The following results were obtained: COD: 71,000 mg.L^-1, total solids: 21,000 mg.L^-1, dissolved solids: 17,000 mg.L^-1; pH: 4.06, conductivity: 9.45 mhoscm^-1, total Fe: 48.83 mg.L^-1, total phenols: 8.66 mg.L^-1; BOD: 30,000 mg.L^-1. Fenton and photo-Fenton reactions were applied to treat the wastewater produced. For the Fenton process, the optimal oxidation conditions found were pH = 3.48, [COD]:[H<inf>2</inf> O<inf>2</inf> ] mass ratio = 1:5, and [Fe⁺²]: [H<inf>2</inf> O<inf>2</inf> ] mass ratio = 1:6. For the photo-Fenton process, the optimal parameters found were: pH = 3.98, [COD]:[H<inf>2</inf> O<inf>2</inf> ] = 1:7.86, and [Fe⁺²]: [H<inf>2</inf> O<inf>2</inf> ] = 1:5. The experimental data were adjusted to fit second order polynomial models with R² = 0.88 for the Fenton process and R² = 0.91 for the photo-Fenton process, respectively. The sludge produced featured the following characteristics: average COD: 41,000 mg.L^-1, total Fe: 296,000 mg.L^-1, pH: 7.7. The variables with the greatest influence in both processes were [Fe⁺²]:[H<inf>2</inf> O<inf>2</inf> ] and [COD]:[H<inf>2</inf> O<inf>2</inf> ].

Año de publicación:

2021

Keywords:

• wastewater
• Fenton reaction
• Alternative energy
• Sustainable processes
• Wastewater

Fuente:

scopus