TY - JOUR
T1 - Formation of disinfection byproducts during Fenton's oxidation of chloride-rich landfill leachate
AU - Iskander, Syeed Md
AU - Zeng, Teng
AU - Smiley, Elizabeth
AU - Bolyard, Stephanie C.
AU - Novak, John T.
AU - He, Zhen
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/15
Y1 - 2020/1/15
N2 - Because of the production of chlorine species in leachate during Fenton's oxidation, harmful disinfection byproducts (DBP) can be formed but this has not been well studied before. Herein, we have investigated five classes of DBP: trihalomethanes, haloacetic acids, haloacetonitriles, haloketones, and halonitromethanes during Fenton's oxidation of landfill leachates. The results show that the DBP concentration increased with the increase of [H2O2]: [Cl−] ratio due to the increased concentration of chlorine species. The highest total DBP concentration was 4860 μg L-1 at [H2O2]: [Cl−] = 4.0 and the lowest was 84 μg L-1 at [H2O2]: [Cl−] = 0.25. Both the DBP concentration and DBP toxicity increased with the increase of the [H2O2]: [Fe2+] ratio, because of the increased concentration and lifetime of the chlorine species. Most of the DBP were formed during the first minute of the reaction and stayed stable up to 3 h, indicating that DBP may not be preferred targets of hydroxyl radicals in the presence of a large amount of organics. In most cases, trihalomethanes dominated the DBP concentration, while haloacetonitriles dominated the total additive toxicity. This study has provided important implications to understand DBP formation during Fenton's oxidation.
AB - Because of the production of chlorine species in leachate during Fenton's oxidation, harmful disinfection byproducts (DBP) can be formed but this has not been well studied before. Herein, we have investigated five classes of DBP: trihalomethanes, haloacetic acids, haloacetonitriles, haloketones, and halonitromethanes during Fenton's oxidation of landfill leachates. The results show that the DBP concentration increased with the increase of [H2O2]: [Cl−] ratio due to the increased concentration of chlorine species. The highest total DBP concentration was 4860 μg L-1 at [H2O2]: [Cl−] = 4.0 and the lowest was 84 μg L-1 at [H2O2]: [Cl−] = 0.25. Both the DBP concentration and DBP toxicity increased with the increase of the [H2O2]: [Fe2+] ratio, because of the increased concentration and lifetime of the chlorine species. Most of the DBP were formed during the first minute of the reaction and stayed stable up to 3 h, indicating that DBP may not be preferred targets of hydroxyl radicals in the presence of a large amount of organics. In most cases, trihalomethanes dominated the DBP concentration, while haloacetonitriles dominated the total additive toxicity. This study has provided important implications to understand DBP formation during Fenton's oxidation.
KW - Advanced oxidation
KW - Disinfection byproducts
KW - Fenton's oxidation
KW - Free chlorine
KW - Landfill leachate
UR - http://www.scopus.com/inward/record.url?scp=85072384872&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85072384872&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2019.121213
DO - 10.1016/j.jhazmat.2019.121213
M3 - Article
C2 - 31557577
AN - SCOPUS:85072384872
SN - 0304-3894
VL - 382
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 121213
ER -