TY - JOUR
T1 - Evaluating the degradation of the herbicides picloram and 2,4-D in a compartmentalized reactive biobarrier with internal liquid recirculation
AU - Ordaz-Guillén, Yolanda
AU - Galíndez-Mayer, Cutberto Juvencio
AU - Ruiz-Ordaz, Nora
AU - Juárez-Ramírez, Cleotilde
AU - Santoyo-Tepole, Fortunata
AU - Ramos-Monroy, Oswaldo
N1 - Funding Information:
Acknowledgments Ramos-Monroy O. was a holder of a research grant from Conacyt. Ruiz-Ordaz N., Juárez-Ramírez C., and Galíndez-Mayer J. are holders of grants from COFAA-IPN, SIP-IPN, and SNI-Conacyt. The authors express their thanks to the staff of the Spectroscopy Central, ENCB IPN, for HPLC analysis.
PY - 2014/7
Y1 - 2014/7
N2 - Tordon is a widely used herbicide formulation of 2,4-dichlorophenoxyacetic acid (2,4-D) and 4-amino-3,5,6-trichloropicolinic acid (picloram), and it is considered a toxic herbicide. The purposes of this work were to assess the feasibility of a microbial consortium inoculated in a lab-scale compartmentalized biobarrier, to remove these herbicides, and isolate, identify, and evaluate their predominant microbial constituents. Volumetric loading rates of herbicides ranging from 31.2 to 143.9 g m-3 day-1, for 2,4-D, and 12.8 to 59.3 g m-3 day-1 for picloram were probed; however, the top operational limit of the biobarrier, detected by a decay in the removal efficiency, was not reached. At the highest loading rates probed, high average removal efficiencies of 2,4-D, 99.56 ± 0.44; picloram, 94.58 ± 2.62; and chemical oxygen demand (COD), 89.42 ± 3.68, were obtained. It was found that the lab-scale biofilm reactor efficiently removed both herbicides at dilution rates ranging from 0.92 to 4.23 day-1, corresponding to hydraulic retention times from 1.087 to 0.236 days. On the other hand, few microbial strains able to degrade picloram are reported in the literature. In this work, three of the nine bacterial strains isolated cometabolically degrade picloram. They were identified as Hydrocarboniphaga sp., Tsukamurella sp., and Cupriavidus sp.
AB - Tordon is a widely used herbicide formulation of 2,4-dichlorophenoxyacetic acid (2,4-D) and 4-amino-3,5,6-trichloropicolinic acid (picloram), and it is considered a toxic herbicide. The purposes of this work were to assess the feasibility of a microbial consortium inoculated in a lab-scale compartmentalized biobarrier, to remove these herbicides, and isolate, identify, and evaluate their predominant microbial constituents. Volumetric loading rates of herbicides ranging from 31.2 to 143.9 g m-3 day-1, for 2,4-D, and 12.8 to 59.3 g m-3 day-1 for picloram were probed; however, the top operational limit of the biobarrier, detected by a decay in the removal efficiency, was not reached. At the highest loading rates probed, high average removal efficiencies of 2,4-D, 99.56 ± 0.44; picloram, 94.58 ± 2.62; and chemical oxygen demand (COD), 89.42 ± 3.68, were obtained. It was found that the lab-scale biofilm reactor efficiently removed both herbicides at dilution rates ranging from 0.92 to 4.23 day-1, corresponding to hydraulic retention times from 1.087 to 0.236 days. On the other hand, few microbial strains able to degrade picloram are reported in the literature. In this work, three of the nine bacterial strains isolated cometabolically degrade picloram. They were identified as Hydrocarboniphaga sp., Tsukamurella sp., and Cupriavidus sp.
KW - Airlift reactor
KW - Biofilm reactor
KW - Herbicide degradation
KW - Microbial acclimation
KW - Microbial consortium
UR - http://www.scopus.com/inward/record.url?scp=84903637664&partnerID=8YFLogxK
U2 - 10.1007/s11356-014-2809-8
DO - 10.1007/s11356-014-2809-8
M3 - Artículo
C2 - 24737019
SN - 0944-1344
VL - 21
SP - 8765
EP - 8773
JO - Environmental Science and Pollution Research
JF - Environmental Science and Pollution Research
IS - 14
ER -