Experimental investigation of the efficiency of removing landfill leachate pollutants using O 3/UV and H2O2 processes

Document Type : Research Paper

Authors

1 Azad university

2 Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran

3 . Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran

10.22078/pr.2025.5521.3455

Abstract

Introduction: Waste leachate contains challenging organic substances and persistent toxins and brings significant environmental concerns. Advanced oxidation processes (AOPS) have been proposed as a suitable and effective solution for leachate treatment. In this research, the effect of various advanced oxidation processes in leachate treatment is investigated. Investigations have been carried out in the form of an experimental study on the waste leachate of Aghajari city on a laboratory scale.
Materials and methods: The methods of using ultraviolet (UV) techniques of ozone with hydrogen peroxide for wastewater treatment have been carried out in a pilot laboratory. At first, optimal conditions were provided for O3 and H2O2, and then the effect of advanced oxidation methods such as (O3/H2O،2 UV/H2O2،UV/O3) at different times and the effect of pH on the removal of BOD, TOC and COD were determined.
Findings: The advanced oxidation methods of UV/H2O2 and O3/H2O2 show a significant difference in comparison. The H2O2/O3 process showed the removal of TOC (90.1% in 20 minutes) compared to H2O2/ UV (85.3% in 80 minutes). In addition, in the H2O2/O3 process, the highest removal percentage of TOC (76%) and BOD (66.3%) compared to UV/ H2O2 showed removal (56.33%BOD, 46.35% TOC). Both processes gave optimal results in pH=8. UV/H2O2 tests showed that the optimum time of irradiation was 80 minutes were investigated in the range of (2-12).
Conclusion: The conclusion of H2O2 /O3 tests showed a better removal efficiency than UV/H2O2 tests on the removal process BOD, COD and TOC . Considering the simultaneous presence of multiple oxidizers and their intensifying effect through the production of active hydroxyl radicals (OH), it can be concluded that UV/O3 is the most efficient method of leachate treatment.

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Journal of Petroleum Research
Volume 35, 1404-1 - Serial Number 140
Special Issue on the Development of the Hydrogen TechnologyChain
May and June 2025

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