Document Detail


Treating landfill leachate by electrocoagulation.
MedLine Citation:
PMID:  19470548     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The determination of the optimal conditions for using electrocoagulation as a treatment for landfill leachate was carried out using surface response methodology. A central composite design was applied to investigate the effect of four control factors, namely current density, pH, time and fluid conductivity, as well as the interaction among (between) them to get an optimal turbidity removal. The independent variables were each coded at three levels and their values were selected on the basis of preliminary experimental results. The central composite design consisted of 29 experimental points with five replications at the centre point. A second order polynomial model was used for predicting the response. Regression analysis showed that more than 95% of the variation was explained by the model wherein current density with a 60.1% contribution turned out to be the factor with the most significant influence. Analysis of variance showed that time, pH, current density and the interaction time/current density had a significant influence on the turbidity removal, The optimal conditions obtained for the removal of turbidity were time 38.8 min, pH 7.6, current density 109.9 A m(-2) and NaCl 2.9 g L(- 1). Experimental results showed that for a 96.9% turbidity removal, similar reduction in Al (97.0%) and Fe (99.5%) concentrations; as well as 66% total Kjeldahl nitrogen removal were obtained. Furthermore, the sludge formed exhibited a good floc size, which separated in less than 10 min by classical sedimentation. The results analysis provided evidence of reduction of chemical pollutants, although the electrocoagulated leachate could not satisfy regulations for the maximum Total Kjeldahl nitrogen leachate discharge level to public wastewater collection systems in the town of Freire, Chile.
Authors:
Job Contreras; Mario Villarroel; Rodrigo Navia; Margarita Teutli
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-05-26
Journal Detail:
Title:  Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA     Volume:  27     ISSN:  0734-242X     ISO Abbreviation:  Waste Manag Res     Publication Date:  2009 Aug 
Date Detail:
Created Date:  2009-07-29     Completed Date:  2009-09-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9881064     Medline TA:  Waste Manag Res     Country:  England    
Other Details:
Languages:  eng     Pagination:  534-41     Citation Subset:  IM    
Affiliation:
Departamento de Ingeniería Química, Universidad de La Frontera, Casilla 54-D, Temuco, Chile.
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MeSH Terms
Descriptor/Qualifier:
Electrochemical Techniques / methods*
Waste Disposal, Fluid / methods*
Water Pollutants, Chemical / chemistry*
Water Pollution, Chemical / prevention & control
Chemical
Reg. No./Substance:
0/Water Pollutants, Chemical

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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