Solar Photochemical Treatment of Winery Wastewater in a CPC Reactor
Lucas, MS; Mosteo, R; Maldonado, MI; Malato, S; Peres, JA. 2009. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 57 (23): 11242-11248
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.
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Published on 06/03/2010