Recovery of phosphorus from sewage sludge ash by heat treatment and liquid-liquid separation

Mauricio Cordova Udaeta, Gjergj Dodbiba, Josiane Ponou, Keiichi Sone, Toyohisa Fujita

研究成果: Article査読

1 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)93-97
ページ数5
ジャーナルInternational Journal of the Society of Material Engineering for Resources
23
1
DOI
出版ステータスPublished - 2018 3月
外部発表はい

ASJC Scopus subject areas

  • 化学工学(全般)
  • 材料科学(全般)
  • 機械工学

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