TY - JOUR
T1 - Biodegradation of the herbicide linuron in a plug-flow packed-bed biofilm channel equipped with top aeration modules
AU - Marrón-Montiel, Erick
AU - Ruiz-Ordaz, Nora
AU - Galíndez-Mayer, Juvencio
AU - Gonzalez-Cuna, Saúl
AU - Tepole, Fortunata Santoyo
AU - Poggi-Varaldo, Héctor
N1 - Publisher Copyright:
© 2014, (publisher). All rights reserved.
PY - 2014
Y1 - 2014
N2 - A lab-scale packed-bed biofilm channel reactor that operates as a plug-flow system equipped with top aeration modules was constructed and evaluated. To assess the reactor performance a microbial community able to degrade linuron was used. Changing the fluid flow rates and the linuron concentrations in the inflowing medium the volumetric loading rates of linuron (BV,L) were gradually increased from 0.29 to 14.93 mg/Lh. During the operation of the reactor, an airflow rate of 0.15 ± 0.05 L/min was maintained in each aeration module. In these working conditions, dissolved oxygen concentrations (OD) of about 5 mg/L were obtained in the aeration modules. For all BV,L values tested, the microbial community colonized the support and removed the linuron with efficiencies of about 100%. The highest removal efficiency measuring the chemical oxygen demand (COD) was about 84%, and no accumulation of aromatic intermediates was detected by HPLC analysis. The results showed that the oxygen consumption rate was proportional to BV,L. The dissolved oxygen was not entirely consumed in the bioreactor indicating that, even at the highest loading rates, the microbial community was not limited by oxygen. The use of top aeration modules was successful, and their place in a packed bed biofilm channel allowed enough dissolved oxygen at the beginning of each stage, and along the whole reactor. It is appropriate to mention that no reports of linuron removal in bioreactors could be found in the literature.
AB - A lab-scale packed-bed biofilm channel reactor that operates as a plug-flow system equipped with top aeration modules was constructed and evaluated. To assess the reactor performance a microbial community able to degrade linuron was used. Changing the fluid flow rates and the linuron concentrations in the inflowing medium the volumetric loading rates of linuron (BV,L) were gradually increased from 0.29 to 14.93 mg/Lh. During the operation of the reactor, an airflow rate of 0.15 ± 0.05 L/min was maintained in each aeration module. In these working conditions, dissolved oxygen concentrations (OD) of about 5 mg/L were obtained in the aeration modules. For all BV,L values tested, the microbial community colonized the support and removed the linuron with efficiencies of about 100%. The highest removal efficiency measuring the chemical oxygen demand (COD) was about 84%, and no accumulation of aromatic intermediates was detected by HPLC analysis. The results showed that the oxygen consumption rate was proportional to BV,L. The dissolved oxygen was not entirely consumed in the bioreactor indicating that, even at the highest loading rates, the microbial community was not limited by oxygen. The use of top aeration modules was successful, and their place in a packed bed biofilm channel allowed enough dissolved oxygen at the beginning of each stage, and along the whole reactor. It is appropriate to mention that no reports of linuron removal in bioreactors could be found in the literature.
KW - Biodegradation
KW - Biofilm
KW - Linuron
KW - Plug-flow
UR - http://www.scopus.com/inward/record.url?scp=84926337696&partnerID=8YFLogxK
U2 - 10.30638/eemj.2014.214
DO - 10.30638/eemj.2014.214
M3 - Artículo
SN - 1582-9596
VL - 13
SP - 1939
EP - 1944
JO - Environmental Engineering and Management Journal
JF - Environmental Engineering and Management Journal
IS - 8
ER -