TY - JOUR
T1 - Electrode surface treatments in sludge electro-osmosis dewatering
AU - Gronchi, Paolo
AU - Canziani, Roberto
AU - Brenna, Andrea
AU - Visigalli, Simone
AU - Colominas, Carles
AU - Montalà, Francesc
AU - Cot, Victor
AU - Stradi, Aristide
AU - Ferrari, Giancarlo
AU - Diaz, Cristina
AU - Fuentes, Gonzalo Garcia
AU - Georgiadis, Argyrios
N1 - Publisher Copyright:
© 2017 Taylor & Francis.
PY - 2017/8/18
Y1 - 2017/8/18
N2 - The sewage sludge dewatering produced by wastewater treatment plants (WWTP) is a multifaceted process due to the presence of colloid fractions. Electro-osmosis could be a suitable technique to reduce the water content of the final sludge. Electric fields of 10, 15, and 20 V/cm have been studied for electro-osmosis tests under the pressure of a static or rotating piston, obtaining a dry solids content up to 40–45%, with respect to 25–30% obtained by mechanical methods. In order to optimize the process, the corrosion behavior and the wear of the anodic material appear to be the main critical aspects, due to the high circulating current density and the use of a rotating electrode. We compared the efficiency and the corrosion resistance of dimensionally stable anodes (DSA) with respect to bare stainless steel (AISI 304) and stainless steel coated by PVD technique with TiN, AlTiN, and DLC. Characterization of the anode surfaces by SEM and potentiodynamic tests show that DSA is the most suitable material for our application. However, efficiencies of the electro-osmosis processes have been found comparable, in terms of developed current densities and total energy consumptions, for short-test duration.
AB - The sewage sludge dewatering produced by wastewater treatment plants (WWTP) is a multifaceted process due to the presence of colloid fractions. Electro-osmosis could be a suitable technique to reduce the water content of the final sludge. Electric fields of 10, 15, and 20 V/cm have been studied for electro-osmosis tests under the pressure of a static or rotating piston, obtaining a dry solids content up to 40–45%, with respect to 25–30% obtained by mechanical methods. In order to optimize the process, the corrosion behavior and the wear of the anodic material appear to be the main critical aspects, due to the high circulating current density and the use of a rotating electrode. We compared the efficiency and the corrosion resistance of dimensionally stable anodes (DSA) with respect to bare stainless steel (AISI 304) and stainless steel coated by PVD technique with TiN, AlTiN, and DLC. Characterization of the anode surfaces by SEM and potentiodynamic tests show that DSA is the most suitable material for our application. However, efficiencies of the electro-osmosis processes have been found comparable, in terms of developed current densities and total energy consumptions, for short-test duration.
KW - Anode
KW - DSA
KW - corrosion
KW - dewatering
KW - electro-osmosis
KW - sludge
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U2 - 10.1080/10426914.2017.1279313
DO - 10.1080/10426914.2017.1279313
M3 - Article
AN - SCOPUS:85011901172
SN - 1042-6914
VL - 32
SP - 1265
EP - 1273
JO - Materials and Manufacturing Processes
JF - Materials and Manufacturing Processes
IS - 11
ER -