Abstract：
:Neonicotinoid insecticides show high persistence in the environment, and standard biological approaches such as biopurification systems have shown mostly inefficient removal of such compounds. In this work, soil pre-exposed to imidacloprid was used to obtain presumptive imidacloprid-degrading consortia. Cometabolic enrichment yielded a microbial consortium composed of eight bacterial and one yeast strains, capable of degrading not only this compound, but also thiamethoxam and acetamiprid, as demonstrated in cross-degradation assays. The biological removal process was scaled-up to batch stirred tank bioreactors (STBR); this configuration was able to simultaneously remove mixtures of imidacloprid + thiamethoxam or imidacloprid + thiamethoxam + acetamiprid, reaching elimination of 95.8% and 94.4% of total neonicotinoids, respectively. Removal rates in the bioreactors followed the pattern imidacloprid > acetamiprid > thiamethoxam, including >99% elimination of imidacloprid in 6 d and 17 d (binary and ternary mixtures, respectively). A comprehensive evaluation of the detoxification in the STBR was performed using different biomarkers: seed germination (Lactuca sativa), bioluminescence inhibition (Vibrio fischeri), and acute oral tests in honeybees. Overall, ecotoxicological tests revealed partial detoxification of the matrix, with clearer detoxification patterns in the binary mixture. This biological approach represents a promising option for the removal of neonicotinoids from agricultural wastewater; however, optimization of the process should be performed before application in farms.
journal_name
Chemospherejournal_title
Chemosphereauthors
Rodríguez-Castillo G,Molina-Rodríguez M,Cambronero-Heinrichs JC,Quirós-Fournier JP,Lizano-Fallas V,Jiménez-Rojas C,Masís-Mora M,Castro-Gutiérrez V,Mata-Araya I,Rodríguez-Rodríguez CEdoi
10.1016/j.chemosphere.2019.07.004subject
Has Abstractpub_date
2019-11-01 00:00:00pages
1097-1106eissn
0045-6535issn
1879-1298pii
S0045-6535(19)31484-5journal_volume
235pub_type
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