TY - JOUR
T1 - Biodegradability enhancement of wastewater containing cefalexin by means of the electro-Fenton oxidation process
AU - Ledezma Estrada, Adriana
AU - Ri, Gyokuyu
AU - Wang, Aimin
PY - 2012/8/15
Y1 - 2012/8/15
N2 - The comparative degradation behavior of cefalexin (CLX) using advanced oxidation processes (AOPs) with the aim of improving CLX biodegradability was studied. Among the AOPs used, RuO 2/Ti anodic oxidation (AO), AO in the presence of electro-generated H 2O 2 (AO-H 2O 2), and the electro-Fenton (EF) process, the EF process was the most effective. In the EF process an activated carbon fiber (ACF) was used as a cathode. Different input variables, including catalyst concentration, pH, and current density were evaluated to find the optimum conditions for the EF. The most suitable operational conditions were as follows: a current density of 6.66mA/cm 2, a pH of 3, and a concentration of 1mM of Fe 2+ as the catalyst. Different CLX concentrations were analyzed as well of different reaction times to assess the degree of mineralization. The change in biodegradability was evaluated by the BOD 5/COD and the BOD 14/COD ratios. The EF did not effectively remove the COD, but removed enough to achieve suitable biodegradability for a further biological process.
AB - The comparative degradation behavior of cefalexin (CLX) using advanced oxidation processes (AOPs) with the aim of improving CLX biodegradability was studied. Among the AOPs used, RuO 2/Ti anodic oxidation (AO), AO in the presence of electro-generated H 2O 2 (AO-H 2O 2), and the electro-Fenton (EF) process, the EF process was the most effective. In the EF process an activated carbon fiber (ACF) was used as a cathode. Different input variables, including catalyst concentration, pH, and current density were evaluated to find the optimum conditions for the EF. The most suitable operational conditions were as follows: a current density of 6.66mA/cm 2, a pH of 3, and a concentration of 1mM of Fe 2+ as the catalyst. Different CLX concentrations were analyzed as well of different reaction times to assess the degree of mineralization. The change in biodegradability was evaluated by the BOD 5/COD and the BOD 14/COD ratios. The EF did not effectively remove the COD, but removed enough to achieve suitable biodegradability for a further biological process.
KW - Advanced oxidation processes (AOPs)
KW - Biodegradability enhancement
KW - Cefalexin
KW - Electro-Fenton process
UR - http://www.scopus.com/inward/record.url?scp=84863582219&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84863582219&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2012.04.079
DO - 10.1016/j.jhazmat.2012.04.079
M3 - Article
C2 - 22664258
AN - SCOPUS:84863582219
SN - 0304-3894
VL - 227-228
SP - 41
EP - 48
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -