Application of electrocoagulation with a new steel-swarf-based electrode for the removal of heavy metals and total coliforms from sanitary landfill leachate
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Data
2021
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Sanitary landfill leachate (LL) composition varies according to climate variables variation,
solid waste characteristics and composition, and landfill age. Leachate treatment is essentially carried
out trough biological and physicochemical processes, which have showed variability in efficiency
and appear a costly solution for the management authorities. Electrocoagulation (EC) seems a
suitable solution for leachate treatment taking into account the characteristics of the liquor. One
of the problems of EC is the electrode passivation, which affects the longevity of the process. One
solution to this problem could be the replacement of the electrode by one made of recyclable material,
which would make it possible to change it frequently and at a lower cost. The objective of the present
work was to evaluate the removal of heavy metals (As, Ba, Cd, Cr, Cu, Fe, Pb, Mn, Ni, Se and Zn)
and coliforms from a LL by EC using electrodes made from steel swarf (SfE) up to 8 h. Removal
efficiencies of detected heavy metals were 51%(Cr), 59%(As), 71%(Cd), 72%(Zn), 92%(Ba), 95%(Ni)
and >99%(Pb). The microbial load of coliforms in leachate was reduced from 10.76 × 104 CFU/mL
(raw leachate) to less than 1 CFU/mL (after treatment with SfE) (i.e., approximately 100% reduction).
The use of SfE in EC of LL is very effective in removing heavy metals and coliforms and can be used
as alternative treatment solution for such effluents.
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Heavy metal removal, Coliforms removal, Landfill leachate, Electrochemical treatment, Steel-swarf-based electrode
Citação
OLIVEIRA, Mayk Teles de et al. Application of Electrocoagulation with a New Steel-Swarf-Based Electrode for the Removal of Heavy Metals and Total Coliforms from Sanitary Landfill Leachate. Applied Sciences, Basileia, v. 11, n. 11, e5009, 2021. DOI: 10.3390/app11115009. Disponível em: https://www.mdpi.com/2076-3417/11/11/5009. Acesso em: 29 jan. 2025.