Treatment of Mature Landfill Leachate by Chemical Precipitation and Fenton Advanced Oxidation Process
Environmental Health Engineering and Management Journal, Winter 2016; 3(1): 35–40
6 Pages Posted: 12 Jul 2017
Date Written: March 15, 2016
Background: Mature landfill leachate is a complicated mixture which is resistant to biological treatment processes. The treatment of mature landfill leachate by struvite precipitation and Fenton oxidation was the main objective of the current research.
Methods: Struvite with the phosphate/ammonia/magnesium molar ratio of 1/1/1.05 was considered during all experiments. Five initial pHs of 3, 4, 5, 6, and 7, four different H2O2/Fe mass ratios of 50, 100, 200, and 400, and reaction times of 20, 40, 80, 120, and 160 minutes were examined for the Fenton oxidation process.
Results: A leachate sample with average chemical oxygen demand (COD), BOD5, and NH4 concentrations of 7350, 2220, and 2280 mg L-1, respectively, and a BOD5/COD ratio of 0.3 was introduced to the chemical precipitation unit. An NH4 removal efficiency of 87% was obtained at pH 8.5 for struvite precipitation. Under optimum conditions of Fenton oxidation, including pH 3, an H2O2/Fe2 mass ratio of 200, and a reaction time of 160 min, more than 95% COD and BOD5 removal was observed.
Conclusion: Struvite precipitation and Fenton oxidation are reliable and efficient alternatives for mature landfill treatment.
Keywords: Landfill, Leachate, Fenton oxidation, Chemical precipitation, Advanced oxidation
Suggested Citation: Suggested Citation