Removal of triazines, triazoles and organophophates in biomixtures and application of a biopurification system for the treatment of laboratory wastewaters.
Biopurification systems (BPS) have been barely explored for removing complex mixtures of pesticides. In this study, the potential of a biomixture to remove simultaneously a mixture of herbicides (triazines), fungicides (triazoles) and insecticides (organophosphates) is presented. Also, a BPS using the same biomixture was used for treating a pesticide testing laboratory wastewater containing a mixture of 38 compounds. Ecotoxicological assays were conducted on the BPS elutriates to investigate the mixture detoxification. A mixture (concentrations of 4-8 mg kg-1) run in small-scale biomixture systems (SSB) for 128 d showed 59.3% removal of triazines, 68.5% of organophosphates and no elimination of triazoles. The treatment of the laboratory wastewater (individual concentrations range: 0.0036-0.25 mg kg-1) in the pilot-scale BPS for 281 d resulted in the elimination pattern of organophosphates (90.0%) > triazoles (73.4%) > carbamates (71.3%) > triazines (54.3%). Complete detoxification towards Daphnia magna and partial detoxification in Lactuca sativa seeds germination occurred in the BPS. Although the pesticide mixture complexity is higher in the BPS, the lower concentrations found in this matrix, could explain removal differences between SSB and BPS and the apparent inhibition in the elimination of carbamates and some triazines observed in the latter. These findings suggest that disposal of pesticide-containing laboratory-wastewater should be done in separate containers, according to chemical groups before their treatment in separate BPS, in order to reduce treatment periods. Monitoring the treatment process in the BPS with a battery of ecotoxicological tests is strongly recommended.
['Masís-Mora|Mario|M|', 'Lizano-Fallas|Verónica|V|', 'Tortella|Gonzalo|G|', 'Beita-Sandí|Wilson|W|', 'Rodríguez-Rodríguez|Carlos E|CE|']
D000818:Animals D001673:Biodegradation, Environmental D002219:Carbamates D003621:Daphnia D054750:Ecotoxicology D005659:Fungicides, Industrial D006540:Herbicides D007306:Insecticides D010755:Organophosphates D010575:Pesticides D014227:Triazines D014230:Triazoles D014865:Waste Disposal, Fluid D062065:Waste Water D014874:Water Pollutants, Chemical
Removal Wastewater Pesticides Degradation Toxicity