Solar treatment of cork boiling and bleaching wastewaters in a pilot plant.
This paper reports on cork boiling and bleaching wastewaters treatment by solar photocatalytic processes, TiO(2)/UV and Fe(2+)/H(2)O(2)/UV (TiO(2)-only for bleaching wastewater), in a pilot plant with compound parabolic collectors. The photo-Fenton reaction (k=0.12L/kJ(UV), r(0)=59.4 mg/kJ(UV)) is much more efficient that TiO(2) photocatalysis and TiO(2)+S(2)O(8)(2-) (k=0.0024 L/kJ(UV), r(0)=1.36 mg/kJ(UV)), leading to 94% mineralization of the bleaching wastewater after 31.5 kJ(UV)/L, consuming 77.1mM of H(2)O(2) (3.0 mmol/kJ(UV)) and using 20 mg/L of iron. For the cork boiling wastewater, after a slow initial reaction rate, the DOC degradation curve shows a first-order kinetics behaviour (k=0.015 L/kJ(UV), r(0)=20.8 mg/kJ(UV)) until 173 kJ(UV)/L ( approximately 300 mgC/L). According to the average oxidation state (AOS), toxicity profiles, respirometry and kinetic results obtained in two solar CPCs plants, the optimal energy dose estimated for phototreatment to reach a biodegradable effluent is 15 kJ(UV)/L and 114 kJ(UV)/L, consuming 33 mM and 151 mM of H(2)OT:/PGN/ELSEVIER/WR/web/00007490/(2), achieving almost 49% and 48% mineralization of the wastewaters, respectively for the cork bleaching and boiling wastewaters.
Vilar
Vítor J P
VJ
LSRE-Laboratory of Separation and Reaction Engineering, Departamento de Engenharia Química, Faculdade de Engenharia da Universidade do Porto, 4200-465 Porto, Portugal. vilar@fe.up.pt
Maldonado
Manuel I
MI
Oller
I
I
Malato
Sixto
S
Boaventura
Rui A R
RA
D048908:Aliivibrio fischeri / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000032:analysis / Q000737:chemistry; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron / Q000737:chemistry; D007700:Kinetics; D010782:Photolysis; D029963:Quercus; D013472:Sunlight; D014025:Titanium / Q000737:chemistry; D018675:Toxicity Tests; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water / Q000737:chemistry; D014873:Water Pollutants / Q000737:chemistry* / Q000528:radiation effects* / Q000633:toxicity; D018508:Water Purification / Q000379:methods
C045076:Fenton's reagent; D007220:Industrial Waste; D014873:Water Pollutants; D014867:Water; C009495:titanium dioxide; D006861:Hydrogen Peroxide; D014025:Titanium; D007501:Iron