期刊
CHEMICAL ENGINEERING JOURNAL
卷 174, 期 1, 页码 206-212出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2011.09.001
关键词
P resource; Aluminium sludge; P recovery; Chemical precipitation
资金
- Environmental Protection Agency, Ireland [2005-ET-MS-38-M3]
- University College Dublin
- Environmental Protection Agency Ireland (EPA) [2005-ET-MS-38-M3] Funding Source: Environmental Protection Agency Ireland (EPA)
The phosphorus (P)-saturated aluminium sludge used as substrate in constructed wetland (CW) for P-rich wastewater treatment was investigated to recover P and Al through chemical precipitations of the P-extraction leachate of the used aluminium sludge. pH plays a key role in such the precipitation processes. The obtained compounds were identified with XRD, FTIR and SEM analyses. The results showed that over 99% PO43- could be recovered as hydroxyapatite by adding calcium chloride at pH of 13. The remaining Al could be fully recovered as amorphous aluminium hydroxide at pH of 7.0 or alternatively as tris(8-hydroxyquinolino)aluminium (Alq(3)) by adding suitable quantity of 8-hydroxyquinoline. Although the purity, structure, characteristics and production control of the compounds are worthy for further investigation, this study successfully developed a post-treatment methodology for beneficially reused aluminium sludge. The significance of this study is not only transferring aluminium sludge from waste to potential P and Al resources but also reducing the environmental risk of final disposal of used aluminium sludge. (C) 2011 Elsevier B.V. All rights reserved.
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