TY - JOUR
T1 - Recovery of phosphorus from sewage sludge ash by heat treatment and liquid-liquid separation
AU - Udaeta, Mauricio Cordova
AU - Dodbiba, Gjergj
AU - Ponou, Josiane
AU - Sone, Keiichi
AU - Fujita, Toyohisa
N1 - Publisher Copyright:
© 2018 Society of Materials Engineering for Resources of Japan. All rights reserved.
PY - 2018/3
Y1 - 2018/3
N2 - Phosphorus is a scarce resource, some estimates predict a peak in production in the years to come; therefore, research efforts on methods to recycle the phosphate generated in urban sewage are increasing. Sewage Sludge Ash (SSA) arises as a promising source for Phosphorus Recycling. This research studies the use of a Heat Treatment, followed by liquid-liquid extraction in order to attain P205 recovery from SSA. The heat treatment was carried out using the addition of Ca(OH)2 and exposure to 1250° C for 30min, in order to form the P-bearing phase Silicocarnotite (Ca5(PO4)SiO4) and a phase similar to the non P-bearing phase Gehlenite (Ca2Al2SiO7). Preliminary experiments have shown that these mineral phases can be separated using a simple extraction using kerosene and a surfactant under controlled pH. When the actual SSA sample was heated this way and then subjected to extraction, a maximum difference of 39% in P2O5 content was obtained at pH = 2 when 0.25% Dodecyl Amino Acetate (DAA) is used as surfactant.
AB - Phosphorus is a scarce resource, some estimates predict a peak in production in the years to come; therefore, research efforts on methods to recycle the phosphate generated in urban sewage are increasing. Sewage Sludge Ash (SSA) arises as a promising source for Phosphorus Recycling. This research studies the use of a Heat Treatment, followed by liquid-liquid extraction in order to attain P205 recovery from SSA. The heat treatment was carried out using the addition of Ca(OH)2 and exposure to 1250° C for 30min, in order to form the P-bearing phase Silicocarnotite (Ca5(PO4)SiO4) and a phase similar to the non P-bearing phase Gehlenite (Ca2Al2SiO7). Preliminary experiments have shown that these mineral phases can be separated using a simple extraction using kerosene and a surfactant under controlled pH. When the actual SSA sample was heated this way and then subjected to extraction, a maximum difference of 39% in P2O5 content was obtained at pH = 2 when 0.25% Dodecyl Amino Acetate (DAA) is used as surfactant.
KW - Heat treatment
KW - Liquid-liquid separation
KW - Phosphorus recovery
KW - Sewage sludge ash
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U2 - 10.5188/ijsmer.23.93
DO - 10.5188/ijsmer.23.93
M3 - Article
AN - SCOPUS:85064753078
VL - 23
SP - 93
EP - 97
JO - International Journal of the Society of Materials Engineering for Resources
JF - International Journal of the Society of Materials Engineering for Resources
SN - 1347-9725
IS - 1
ER -