TY - JOUR
T1 - Electro-oxidation of landfill leachate using boron-doped diamond
T2 - Role of current density, pH and ions
AU - Agustina, F.
AU - Bagastyo, A. Y.
AU - Nurhayati, E.
N1 - Publisher Copyright:
© IWA Publishing 2019 Water Science & Technology
PY - 2019
Y1 - 2019
N2 - Electro-oxidation using a boron-doped diamond (BDD) anode can be used as an alternative to leachate treatment. Aside from the hydroxyl radical, BDDs are capable of generating chloride and sulfate radical species that play significant roles in the oxidation of pollutants. This research investigated the role of Cl:SO4 2 ions at molar ratios of 237:1, 4:1 and 18:1, and the influence of applied current density (i.e. 50, 75 and 100 mA cm2) on the removal of organic and ammonium contaminants. The results show that current density had considerable effects on chemical oxygen demand (COD) and colour removal, while ion composition of Cl:SO4 2 at pH 3, 5 and 8.5 (original pH) gave different effects on COD and ammonium removal. The pH had a significant effect on the COD removal at the ratio of 237:1, but showed no dramatic effect at the ratio of 18:1, giving ∼40% of COD removal at all pHs tested. This indicates that electro-oxidation at the ratio of 18:1 could be effectively conducted at a wide range of pH. Furthermore, the optimum ammonium removal was obtained at pH 8.5 with the ratio of 237:1. This process was found to be ineffective in increasing the biodegradability index of the leachate; instead, it exhibited mineralization of organic content.
AB - Electro-oxidation using a boron-doped diamond (BDD) anode can be used as an alternative to leachate treatment. Aside from the hydroxyl radical, BDDs are capable of generating chloride and sulfate radical species that play significant roles in the oxidation of pollutants. This research investigated the role of Cl:SO4 2 ions at molar ratios of 237:1, 4:1 and 18:1, and the influence of applied current density (i.e. 50, 75 and 100 mA cm2) on the removal of organic and ammonium contaminants. The results show that current density had considerable effects on chemical oxygen demand (COD) and colour removal, while ion composition of Cl:SO4 2 at pH 3, 5 and 8.5 (original pH) gave different effects on COD and ammonium removal. The pH had a significant effect on the COD removal at the ratio of 237:1, but showed no dramatic effect at the ratio of 18:1, giving ∼40% of COD removal at all pHs tested. This indicates that electro-oxidation at the ratio of 18:1 could be effectively conducted at a wide range of pH. Furthermore, the optimum ammonium removal was obtained at pH 8.5 with the ratio of 237:1. This process was found to be ineffective in increasing the biodegradability index of the leachate; instead, it exhibited mineralization of organic content.
KW - Boron-doped diamond anode
KW - Electrochemical oxidation
KW - Leachate
UR - http://www.scopus.com/inward/record.url?scp=85065430866&partnerID=8YFLogxK
U2 - 10.2166/wst.2019.040
DO - 10.2166/wst.2019.040
M3 - Article
C2 - 31025971
AN - SCOPUS:85065430866
SN - 0273-1223
VL - 79
SP - 921
EP - 928
JO - Water Science and Technology
JF - Water Science and Technology
IS - 5
ER -