title: High salinity effect on bioremediation of pretreated pesticide lixiviates from greenhouses.
abstract: Hydroponics culture greenhouses usually work in closed and semi-closed irrigation systems for nutrients and water-saving purposes. Photo-Fenton reaction has been revealed as an efficient way to depollute that kind of recycled effluents containing pesticides, even for high salinity concentrations. However, the inefficacy of organic matter chemical depletion imposes the use of a subsequent treatment. This work proposes the suitability of an integration of advanced oxidation process with a subsequent bioreactor to treat greenhouse lixiviates effluents at high or extremely high conductivity (salts concentration: up to 42 g L⁻¹). As a first step in this study, the performance of a series of sequencing batch reactors was monitored in order to check the biocompatibility of photo-Fenton pretreated effluents depending on their salinity content. In the second step, those same pretreated effluents were loaded to a biofiltration column filled with expanded clay. Finally, bacterial 16S rRNA gene sequencing was carried out to analyse microbial diversity of the biomass developed in the column. Results stated that the chemical-biological coupled system is effective for the treatment of water effluents containing pesticides. The integrated system is able to deplete more than 80% of the organic load, even under extremely high salinity.
authors.affiliation: a Departament d'Enginyeria Química , Universitat de Barcelona , Martí i Franquès 1, 6th floor; 08028 Barcelona , Spain.|b ACCIONA Agua , S.A.U. Avda. de les Garrigues, 22; Parque de Negocios Mas Blau II; 08820 El Prat de Llobregat, Barcelona , Spain.
authors.forename: María M
authors.initials: MM
authors.lastname: Micó
authors.affiliation: a Departament d'Enginyeria Química , Universitat de Barcelona , Martí i Franquès 1, 6th floor; 08028 Barcelona , Spain.
authors.forename: Óscar
authors.initials: Ó
authors.lastname: González
authors.affiliation: b ACCIONA Agua , S.A.U. Avda. de les Garrigues, 22; Parque de Negocios Mas Blau II; 08820 El Prat de Llobregat, Barcelona , Spain.
authors.forename: Jordi
authors.initials: J
authors.lastname: Bacardit
authors.affiliation: b ACCIONA Agua , S.A.U. Avda. de les Garrigues, 22; Parque de Negocios Mas Blau II; 08820 El Prat de Llobregat, Barcelona , Spain.
authors.forename: Jorge
authors.initials: J
authors.lastname: Malfeito
authors.affiliation: a Departament d'Enginyeria Química , Universitat de Barcelona , Martí i Franquès 1, 6th floor; 08028 Barcelona , Spain.
authors.forename: Carme
authors.initials: C
authors.lastname: Sans
mesh_terms: D000538:Aluminum Silicates / Q000378:metabolism; D001419:Bacteria / Q000145:classification; D001673:Biodegradation, Environmental; D019149:Bioreactors; D000077215:Clay; D004269:DNA, Bacterial / Q000235:genetics; D005374:Filtration; D006861:Hydrogen Peroxide / Q000737:chemistry; D064307:Microbiota; D010084:Oxidation-Reduction; D010575:Pesticides / Q000378:metabolism*; D010782:Photolysis; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D054712:Salinity; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D000538:Aluminum Silicates; D004269:DNA, Bacterial; D010575:Pesticides; D012336:RNA, Ribosomal, 16S; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; D000077215:Clay
keywords: 16s rRNA; Photo-Fenton; biofilter; imidacloprid; methomyl; sequencing batch reactors