Performance evaluation of different solar advanced oxidation processes applied to the treatment of a real textile dyeing wastewater
2015
Manenti, Diego R. | Soares, Petrick A. | Silva, Tânia F.C.V. | Módenes, Aparecido N. | Espinoza-Quiñones, Fernando R. | Bergamasco, Rosângela | Boaventura, Rui A.R. | Vilar, Vítor J.P.
The performance of different solar-driven advanced oxidation processes (AOPs), such as TiO₂/UV, TiO₂/H₂O₂/UV, and Fe²⁺/H₂O₂/UV–visible in the treatment of a real textile effluent using a pilot plant with compound parabolic collectors (CPCs), was investigated. The influence of the main photo-Fenton reaction variables such as iron concentration (20–100 mg Fe²⁺L⁻¹), pH (2.4–4.5), temperature (10–50 °C), and irradiance (22–68 WUV m⁻²) was evaluated in a lab-scale prototype using artificial solar radiation. The real textile wastewater presented a beige color, with a maximum absorbance peak at 641 nm, alkaline pH (8.1), moderate organic content (dissolved organic carbon (DOC) = 129 mg C L⁻¹and chemical oxygen demand (COD) = 496 mg O₂L⁻¹), and high conductivity mainly associated to the high concentration of chloride (1.1 g Cl⁻L⁻¹), sulfate (0.4 g SO₄² ⁻ L⁻ ¹), and sodium (1.2 g Na⁺L⁻¹) ions. Although all the processes tested contributed to complete decolorization and effective mineralization, the most efficient process was the solar photo-Fenton with an optimum catalyst concentration of 60 mg Fe2+ L−1, leading to 70 % mineralization (DOCfinal = 41 mg C L−1; CODfinal < 150 mg O2 L−1) at pH 3.6, requiring a UV energy dose of 3.5 kJUV L−1 (t 30 W = 22.4 min; T =30 ∘ C ; UV(G,n) =44W m −2 ) and consuming 18.5 mM of H2O2.
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