期刊名称：Environmental Health Engineering and Management
印刷版ISSN：2423-3765
电子版ISSN：2423-4311
出版年度：2016
卷号：3
期号：1
页码：35-40
语种：English
出版社：Kerman University of Medical Sciences
摘要：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..
关键词：Landfill; Leachate; Fenton oxidation; Chemical precipitation; Advanced oxidation
