Abstract
Leachate often contains many organic compounds, inorganic substances, and heavy metals, which require appropriate treatment technology solutions to enhance treatment efficiency and cost saving. The electrocoagulation process combined with Fenton-ozone was studied as a pretreatment for landfill leachate of Phuoc Thoi - O Mon to determine suitable operating parameters. Firstly, the electrocoagulation process (electrode area of 486 cm2, current density of A = 0.522 A /m2, inclination of electrode of 45o, retention time of 1.66 h) was applied with removal efficiency of turbidity (58.16%), color (65.73%), COD (55.1%), SS (71.92%), BOD5 (33.04%), TP (68.42%), Fe (55.16%), Cr6+ (76.13%), and TKN (11.9%). Next, leachate was treated with Fenton - ozone process (at pH 3, retention times of 70 minutes and H2O2 : Fe2+ ratio of 4 : 1). The removal efficiency of turbidity, color, SS, COD, BOD5, and TKN was found at 43,89%, 65.81%, 26.26%, 69.64%, 29.63%, and 7.9%, respectively, and none of Cr6+, TP, and PO43- was detected. The BOD5/COD ratio after electrocoagulation and Fenton-ozone processes was enhanced from 0.19 ± 0.02 to 0.58 ± 0.04 which is suitable for next biological treatment steps.
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