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Solar reclamation of agro-wastewater polluted with eight pesticides by heterogeneous photocatalysis using a modular facility. A case study

Garrido, I., Flores, P., Hellín, P., Vela, N., Navarro, S., Fenoll, J.
Chemosphere 2020 v.249 pp. 126156
acetamiprid, autumn, case studies, commercial farms, cyproconazole, cyprodinil, difenoconazole, fenhexamid, fruit crops, hexythiazox, myclobutanil, pesticide residues, photocatalysis, solar radiation, thiamethoxam, titanium dioxide, water treatment, Spain
In this work, we have studied the removal of eight pesticides, commonly used in fruit crops, in agro-wastewater generated in commercial farms by the cleaning of trace of phytosanitary products in containers and tanks from treatment equipment. The studied pesticides were acetamiprid, cyproconazole, cyprodinil, difenoconazole, fenhexamid, hexythiazox, myclobutanil and thiamethoxam. The trials were performed in a pilot facility located in Murcia (SE of Spain), using natural sunlight and titanium dioxide (TiO₂) in tandem with Na₂S₂O₈. Five photocatalytic treatments were carried out during autumn 2017. Results show that the mean (n = 5) final amount was about 13% of the initial pesticide mass present in agro-wastewater. Therefore, we have proved that this technology could be used for tackling the elimination of pesticide residues in agro-wastewater and has favourable prospects of being applied in the water treatment sector.