Treatment of leachate by electrocoagulation using aluminum and iron electrodes

In this paper, treatment of leachate by electrocoagulation (EC) has been investigated in a batch process. The sample of leachate was supplied from Odayeri Landfill Site in Istanbul. Firstly, EC was compared with classical chemical coagulation (CC) process via COD removal. The first comparison result...

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Bibliographic Details
Published in:Journal of hazardous materials 2008-06, Vol.154 (1), p.381-389
Main Authors: Ilhan, Fatih, Kurt, Ugur, Apaydin, Omer, Gonullu, M. Talha
Format: Article
Language:English
Subjects:
Aluminum - chemistry
Ammonia - analysis
Applied sciences
Costs and Cost Analysis
Electrochemistry
Electrocoagulation
Electrodes
Exact sciences and technology
General treatment and storage processes
Hydrogen-Ion Concentration
Iron - chemistry
Iron and aluminum electrodes
Leachate
Mixing and aeration
Pollution
Refuse Disposal
Sulfates
Temperature
Turkey
Unit treatment cost
Waste Disposal, Fluid - economics
Waste Disposal, Fluid - methods
Wastes
Water Pollutants, Chemical - chemistry
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Summary:In this paper, treatment of leachate by electrocoagulation (EC) has been investigated in a batch process. The sample of leachate was supplied from Odayeri Landfill Site in Istanbul. Firstly, EC was compared with classical chemical coagulation (CC) process via COD removal. The first comparison results with 348 A/m 2 current density showed that EC process has higher treatment performance than CC process. Secondly, effects of process variables such as electrode material, current density (from 348 to 631 A/m 2), pH, treatment cost, and operating time for EC process are investigated on COD and NH 4-N removal efficiencies. The appropriate electrode type search for EC provided that aluminum supplies more COD removal (56%) than iron electrode (35%) at the end of the 30 min operating time. Finally, EC experiments were also continued to determine the efficiency of ammonia removal, and the effects of current density, mixing, and aeration. All the findings of the study revealed that treatment of leachate by EC can be used as a step of a joint treatment.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2007.10.035