Open AccessTreatment of landfill leachate by a combined process: Iron electrodissolution, iron oxidation by H 2 O 2 and chemical flocculation
Author(s) -
Dayana Donneys-Victoria,
Nilson Marriaga-Cabrales,
Ruben Jesus Camargo Amado,
Fiderman Machuca-Martínez,
Juan M. PeraltaHernández,
Carlos A. MartínezHuitle
Publication year - 2018
Publication title -
sustainable environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.061
H-Index - 29
ISSN - 2468-2039
DOI - 10.1016/j.serj.2017.07.003
Subject(s) - chemistry , chemical oxygen demand , flocculation , leachate , hydrogen peroxide , turbidity , effluent , chloride , polyacrylamide , inorganic chemistry , nuclear chemistry , environmental chemistry , environmental engineering , wastewater , organic chemistry , environmental science , oceanography , polymer chemistry , geology
The efficiency of iron electrodissolution and the flocculation processes with Fe2+ and Fe3+ for removing color, turbidity, chloride and chemical oxygen demand (COD) were studied by treating a landfill leachate effluent from âEl Carrascoâ (Bucaramanga, Colombia). The pH and current density for the electrodissolution treatment were determined from potentiodynamic polarization studies. The electrodissolution process was performed under galvanostatic conditions at 24 A mâ2 with changing polarity of the electrodes. Hydrogen peroxide was used for the oxidation of Fe2+ to Fe3+ while Ca(OH)2 was used for the flocculation as the pH modifier and coagulant adjuvant agent along with an anionic polyacrylamide. The results showed that higher removal efficiencies of the COD, color and turbidity were obtained (85, 96 and 76%, respectively) using 0.225 g Lâ1 of hydrogen peroxide at pH about 8.5 after 150 min; requiring 0.6 kWh mâ3 and a total treatment cost of 2.24 USD mâ3. Keywords: Leachate, Iron electrodissolution, Potentiodynamic polarization, Flocculatio