화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.103, 195-204, November, 2021
DOI10.1016/j.jiec.2021.07.033  Export Citation
Recovery of aluminum from water treatment sludge for phosphorus removal by combined calcination and extraction
Tuan Van Truong, Diwakar Tiwari1, Young Sun Mok2, and Dong-Jin Kim†
  • Department of Environmental Sciences and Biotechnology & Institute of Energy and Environment, Hallym University, Chuncheon 24252, Republic of Korea
  • 1Department of Chemistry, School of Physical Sciences, Mizoram University, Aizawl 796004, India
  • 2Department of Chemical and Biological Engineering, Jeju National University, Jeju 63243, Republic of Korea
E-mail:
Combined calcination (700 °C) and extraction was applied for aluminum recovery from alum sludge (AS) for phosphorus removal. Calcined AS had higher aluminum and lower COD content than the intact and dried AS. Both acid and alkali extraction recovered more than 90% of the aluminum in the intact and the pretreated AS. Alkali extract of the AS had less heavy metals and COD contents than the acid extract. Response surface methodology (RSM) of Box.Behnken Design (BBD) was applied to find the optimal condition for phosphorus removal with the recovered aluminum solutions. The aluminum solutions showed that the highest phosphorus removal efficiency was more than 98% at the optimal condition (pH 6.4 and Al/P molar ratio higher than 2) with the extract from the calcined AS. FTIR and XRD analyses confirmed that the recovered precipitate contained AlPO4 and Al(OH)3.
Keywords:Al recovery;Alum sludge;Calcination;Extraction;Phosphorus removal
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