Degradation of simulated winery wastewater was studied in a pilot-scale compound parabolic collector (CPC) solar reactor. Total organic carbon (TOC) reduction by heterogeneous photocatalysis (TiO2) and homogeneous photocatalysis with photo-Fenton was observed. The influence of TiO2 concentration (200 or 500 mg/L) and also of combining TiO2 with H2O2 or Na2S2O8 on heterogeneous photocatalysis was evaluated. Heterogeneous photocatalysis with TiO2, TiO2/H2O2 and TiO2/S2O82- is revealed to be inefficient in removing TOC, originating TOC degradation of 10%, 11% and 25%, respectively, at best. However, photo-Fenton experiments led to 46% TOC degradation in simulated wastewater prepared with diluted wine (WV) and 93% in wastewater prepared with diluted grape juice (WG), and if ethanol is previously eliminated from mixed wine and grape juice wastewater (WW) by air stripping, it removes 96% of TOC. Furthermore, toxicity decreases during the photo-Fenton reaction very significantly from 48% to 28%. At the same time, total polyphenols decrease 92%, improving wastewater biodegradability. (We recommend that you consult the full text of this article).
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