Solar photochemical treatment of winery wastewater in a CPC reactor.
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 (TiO(2)) and homogeneous photocatalysis with photo-Fenton was observed. The influence of TiO(2) concentration (200 or 500 mg/L) and also of combining TiO(2) with H(2)O(2) or Na(2)S(2)O(8) on heterogeneous photocatalysis was evaluated. Heterogeneous photocatalysis with TiO(2), TiO(2)/H(2)O(2) and TiO(2)/S(2)O(8)(2-) 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.
Lucas
Marco S
MS
Centro de Química, Universidade de Trás-os-Montes e Alto Douro, Apartado 1013, Vila Real, Portugal. mlucas@utad.pt
Mosteo
Rosa
R
Maldonado
Manuel I
MI
Malato
Sixto
S
Peres
José A
JA
D019149:Bioreactors; D007220:Industrial Waste / Q000032:analysis*; D055668:Photochemical Processes; D013472:Sunlight; D014025:Titanium / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*
D007220:Industrial Waste; C009495:titanium dioxide; D014025:Titanium