Use of solar energy in the treatment of water contaminated with phenol by photochemical processes

Abstract

-The solar driven photo-Fenton process for treating water containing phenol as a contaminant has been evaluated by means of pilot-scale experiments with a parabolic trough solar reactor (PTR). The effects of Fe(II) (0.04-1.0 mmol L -1 ), H 2 O 2 (7-270 mmol L -1 ), initial phenol concentration (100 and 500 mg C L -1 ), solar radiation, and operation mode (batch and fed-batch) on the process efficiency were investigated. More than 90% of the dissolved organic carbon (DOC) was removed within 3 hours of irradiation or less, a performance equivalent to that of artificially-irradiated reactors, indicating that solar light can be used either as an effective complementary or as an alternative source of photons for the photo-Fenton degradation process. A non-linear multivariable model based on a neural network was fit to the experimental results of batch-mode experiments in order to evaluate the relative importance of the process variables considered on the DOC removal over the reaction time. This included solar radiation, which is not a controlled variable. The observed behavior of the system in batch-mode was compared with fed-batch experiments carried out under similar conditions. The main contribution of the study consists of the results from experiments under different conditions and the discussion of the system behavior. Both constitute important information for the design and scale-up of solar radiation-based photodegradation processes.

Improvement of the flocculation process in water treatment by using moringa oleifera seeds extract

“…It can be a social-change factor, since it allows water treatment without dependence on external coagulants and flocculants (Wilderer, 2004;Nogueira et al, 2008).…”

Degradation of 2-hydroxybenzoic acid by advanced oxidation processes

“…Finally, more efficient methods for destroying organic pollutants from wastewaters at lab and pilot plant scale are being developed from the advanced oxidation technology (Nogueira et al, 2008;Muhammad et al, 2008;Luna et al, 2006;Silva et al, 2002;Tôrres et al, 2007;Santos et al, 2006;Azevedo et al, 2009). The most suitable materials and optimized experimental conditions are established in most photocatalytic and catalytic techniques for different reactor configurations.…”

Evaluación de Fotocatalizadores Ti02/ZnO para el Tratamiento de Aguas Residuales Industriales

“…Para el caso de esta agua residual la diferencia del 1 O % no parece influir en el tiempo de operación puesto que las reacciones se llevaron a cabo entre las 12:00 a 14:00 cuando la intensidad de radiación es mayor y aproximadamente constante [13,14,15].…”