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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 9, 2015, pp. 2979-2986
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Bioline Code: st15280
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 9, 2015, pp. 2979-2986
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Double aluminum recovery and its reuse in wastewater treatment
Barrera-Díaz, C.; Varela-Guerrero, V.; Gonzalez-Rivas, N. & Ureña-Núñez, F.
Abstract
This work evaluates the use of aluminum
contained in the aluminum–polyethylene films as anodic
electrodes using the electrocoagulation technique to reduce
the pollutant contents of industrial wastewater quickly and
effectively. Thermal treatment at 500 ºC produces pure
aluminum (according to TGA and SEM/EDS analysis)
which is used to construct aluminum disks (applying
6 tons/cm2 of pressure). Aluminum disks are used as
cathodes and anodes in an electrochemical cell. The current
density applied in the recovered Al electrodes was
12 mA cm-2, and the maximum COD reduction of
wastewater was 77 % at 25 min of treatment. The color
and turbidity reductions are 87 and 90 %, respectively. The
resulting sludge of wastewater treatment was thermally
treated and a second aluminum recovery was reached;
since the organic material present in the sludge was
removed by the high temperature, the obtained aluminum
was pure enough for its reuse. The use of aluminum–
polyethylene films as electrodes in the electrocoagulation
process contributes to the pollutant removal without the
addition of chemical reagents or changing the pH, so it is
both effective and environmentally friendly.
Keywords
Electrocoagulation; Material recuperation; Tetra pak; Waste management
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