This work presents batch mode experiments of combination ultrasonic wave (USW) and H2O2 in pre-treatment of landfill leachate. Additionally, in continuous mode experiments, a modified aerated bio-filter (ABF) was designed for the treatment of synthetic wastewater and the leachate (after treatment by USW/H2O2), with the stepwise increasing the volume ratios between the leachate and synthetic wastewater up to 100% of the leachate. The leachate was collected from Thuy Phuong landfill in Thua Thien Hue province, Vietnam, with characterized of color: 14,213 ± 150 PCU (n=3), N-NH4: 1213 ± 148 mg/L (n = 3), COD: 6068 ± 1611 mg/L (n = 3), BOD5: 1211 ± 158 mg/L (n=3), BOD5/COD: ~0.21 and pH ~7.7. The USW/H2O2 had shown a great potential to remove COD, N-NH4 and color of the raw leachate in short treatment time (5 mins). The ABF system was well operated with organic loads (0.26 to 1.13 kg-COD/m3/d), with a very small sludge volume was formed. Moreover, the presence H2O2 can be used for decreasing odor of the leachate. As “green” advanced oxidation process (AOPs), the combination of USW/H2O2 could be used to improve the effectiveness of activated sludge process in treatment of refractory compounds from landfill leachate.
Suitable conditions for advanced oxidation process by the amount of ozone reaction and the amount of dioxin degradation in landfill leachate
