Phosphorus removal from waste waters using basic oxygen steel slag

Bowden, L.I., Jarvis, A.P., Younger, P.L. and Johnson, K.L. (2009) Phosphorus removal from waste waters using basic oxygen steel slag. Environmental Science and Technology, 43(7), pp. 2476-2481. (doi: 10.1021/es801626d)

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Few studies have characterized reactive media for phosphorus (P) removal in passive treatment systems in terms of both batch and continuous flow experiments. This study uses basic oxygen steel slag (BOS) from a U.K. feedstock. Batch experiments demonstrated the effective removal of phosphorus with varying initial pH, initial P concentration, clast size, and ionic strength to represent environmental conditions. Continuous flow column experiments, operated for 406 days, with an influent P concentration of 1−50 mg/L (typical of domestic and dairy parlour waste) achieved removal of up to 62%; a second set of column experiments running for 306 days with an influent P concentration of 100−300 mg/L achieved a maximum effective removal of 8.39 mg/g. This figure is higher than that for other slags reviewed in this study (e.g., EAF Slag 3.93 mg/g and NZ melter slag 1.23 mg/g). XRD, E-SEM, and EDX data provide evidence for a sequential series of increasingly less soluble P mineral phases forming on the BOS surface (octa-calcium phosphate, brushite, and hydroxylapatite), which suggests that BOS may be a suitable substrate in passive treatment systems, providing a long-term P removal mechanism.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Younger, Professor Paul
Authors: Bowden, L.I., Jarvis, A.P., Younger, P.L., and Johnson, K.L.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Environmental Science and Technology
Journal Abbr.:EST
Publisher:American Chemical Society
ISSN (Online):1520-5851
Published Online:27 February 2009

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