treatment of mature landfill leachate by chemical precipitation and fenton advanced oxidation process

Authors

nemat alah jaafarzadeh haghighi fard environmental technologies research center, department of environmental health engineering, school of health, ahvaz jundishapur university of medical sciences, ahvaz, iran

sahand jorfi environmental technologies research center, department of environmental health engineering, school of health, ahvaz jundishapur university of medical sciences, ahvaz, iran

mehdi ahmadi environmental technologies research center, department of environmental health engineering, school of health, ahvaz jundishapur university of medical sciences, ahvaz, iran

samaneh mirali department of environmental health engineering, school of health, ahvaz jundishapur university of medical sciences, ahvaz, iran

abstract

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.

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Journal title:
environmental health engineering and management

جلد ۳، شماره ۱، صفحات ۳۵-۴۰

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