期刊
ECOLOGICAL ENGINEERING
卷 97, 期 -, 页码 558-566出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ecoleng.2016.10.066
关键词
Adsorption; Mussel shell; Phosphate; Precipitation; Wastewater
资金
- Spanish Ministry of Economy and Competitiveness [CGL2012-36805-C02-01, CGL2012-36805-C02-02]
- European Regional Development Fund (ERDF) (FEDER in Spain)
- Juan de la Cierva [JCI-2012-11778]
Mussel shell is a carbonate-rich by-product that could be recycled in wastewater treatment. In this work, phosphorus removal from aqueous solutions was obtained in a series of batch and column experiments in the laboratory, using a calcined and a finely-ground (non-calcined) mussel shell. Phosphorus removal followed a Freundlich model at high contact times (72h) and a Langmuir model at lower time (24h). Phosphorus removal capacity increased with contact time and with P concentration in the solution, while desorption of the retained P was very low (<4%). Calcined mussel shell presented a higher retention capacity than the fine shell, which can be attributed to differences in mineralogy and composition. The process of P removal from aqueous solution showed features that are typical of chemical reactions rather than denoting adsorption; concretely, the percentage of P removed increased with initial P concentration in the solution, thus pointing at a relevant role of precipitation in P removal. The results corresponding to the fractionation of the P retained in the mussel shell after the experiments showed that both mechanisms, adsorption and precipitation, contributed to P removal. (C) 2016 Elsevier B.V. All rights reserved.
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