Use of organic fertilizers in solar photo-Fenton process as potential technology to remove pineapple processing wastewater in Costa Rica
Fecha
2022-11-29
Tipo
artículo original
Autores
Bolaños Picado, Dayatri Vanessa
Masís Mora, Mario Alberto
Durán Herrera, Esteban
Pérez Mercado, Luís Fernando
López Vinent, Núria
Cruz Alcalde, Alberto
Álvarez Caero, María Mercedes
Rodríguez Rodríguez, Carlos E.
Sans Mazón, Carmen
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Resumen
Background: This work studied the use of the organic fertilizers
DTPA-Fe and EDDS-Fe as iron chelates for solar driven photo-Fenton
process at natural pH. This process was proposed to investigate its
performance on removing a mixture of agrochemicals (propiconazole,
imidacloprid and diuron) from pineapple processing wastewater to
obtain a suitable effluent to be reused in the agricultural sector.
Methods: Experiments were carried out in a solar simulator with a
stirred cylindric photoreactor, with a volume of 150 mL and controlled
temperature (20°C). The first set of experiments was carried out with
ultrapure water to determine optimal iron and H2O2
concentrations.
The second was performed with simulated wastewater of pineapple
processing.
Results: The optimized operational conditions for both iron
complexes were 10 mg L-1 of Fe (III) and 25 mg L-1 of H2O2
, since
more than 80% of micropollutants (MP) (at an initial concentration of 1
mg L-1 of each compound) were removed in only 20 min with both
DTPA-Fe and EDDS-Fe. The effect of organic matter and inorganic salts
on radicals scavenging and chelates stability was also investigated in
the experiments performed with synthetic pineapple processing
wastewater. The results disclosed differences depending on the iron
complex. Nitrites were the principal component influencing the tests
carried out with EDDS-Fe. While carbonates at low concentration only
significantly affected the experiments performed with DTPA-Fe, they were the major influence on the MPs removal efficiency decrease. In
contrast, the presence of Ca2+ and Mg2+ only influence on this last
one. Finally, the results of phytotoxicity disclosed the suitability of
treated effluent to be reused in the agricultural sector.
Conclusions: This work demonstrated that solar powered photo Fenton catalysed by iron fertilizer EDDS is a suitable technology for
depolluting water streams coming from pineapple processing plants
at circumneutral pH, and its subsequent reuse for crop irrigation.
Descripción
Palabras clave
ORGANIC FERTILIZER, Pineapple wastewater, Solar-based process, WASTEWATER TREATMENT