Abstract：
:The electrochemical regeneration of real spent activated carbons (AC) used in drinking water treatment plants was studied at different reactor scales. The electrochemical regeneration was carried out in a 6 g filter-press cell and a 3.5 kg batch reactor, allowing the scaling-up of the process between the two electrolytic reactors. The effect of the electrolyte, the divided/undivided compartment configuration and the current density were studied in the filter-press cell. The effect of compartment configuration and the influence of the regeneration time were studied in the scaled-up reactor. A current density of 0.025 A cm-2 was used and the electrodes were Pt/Ti as anode and Pt/Ti and stainless-steel as cathode. The ACs were characterized by N2 adsorption isotherms to analyse the recovery of porosity and TPD-MS to analyse the AC surface after the electrochemical treatment. In filter-press cell, a recovery of the surface area of 96% was achieved after 8 h of treatment, by introducing the AC in the cathodic compartment using 0.05 M H2SO4 solution as electrolyte. In the 3.5 kg electrochemical reactor, 95% of the pristine AC surface area was recovered. Thus, electrochemical methods can provide a green alternative to the regeneration of spent AC.
journal_name
Chemospherejournal_title
Chemosphereauthors
Ferrández-Gómez B,Ruiz-Rosas R,Beaumont S,Cazorla-Amorós D,Morallón Edoi
10.1016/j.chemosphere.2020.128399subject
Has Abstractpub_date
2021-02-01 00:00:00pages
128399issue
Pt 1eissn
0045-6535issn
1879-1298pii
S0045-6535(20)32594-7journal_volume
264pub_type
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