Nature Environment and Pollution Technology

Na Sun ¹, Xian Li ², Peng Zhan ², Fengping Hu ¹, Zhanmeng Liu ²

Affiliations
1 Planning and Design Research Institute, East China Jiao Tong University, 808 East Shuanggang Road, Nanchang, 330031, CN
2 School of Civil Engineering and Architecture, East China Jiao Tong University, 808 East Shuanggang Road, Nanchang, 330013, CN

Abstract

Using heat to activate persulfacte for the generation of sulfate radicals (SO₄ -.) was proposed for the treatment of leachate biochemical effluents. The effects of different variables on the oxidation efficiency, including oxidant dosage, temperature, pH value and reaction time, were investigated. The experimental results showed that the contaminants in the leachate biochemical effluents can be efficiently removed using the heat/Na₂S₂O₈ system. Using the single factor variable method, the optimal conditions included 4 g/L oxidant dosage, 60°C reaction temperature, pH 4 and 12 h reaction time, resulting in the COD and colour removal efficiency of 63% and 100%, respectively. The analyses of three-dimensional excitationemission matrix fluorescence spectrum (3DEEMFS) and ultraviolet-visible spectra (UV-vis), both illuminated that the macromolecular HA in the wastewater samples were degraded into smaller molecular fulvic acids (FA) via heat/Na₂S₂O₈ system. All these encouraged results demonstrated that the persulfacte activation used heat is a promising and efficient technology for the treatment of leachate biochemical effluents.

Keywords

Landfill Leachate, Heat Activation, Persulfacte Process, Sulfate Radicals.

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