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Mechanistic study of P retention by dewatered waterworks sludges

Al-Tahmazi, T. and Babatunde, Akintunde 2016. Mechanistic study of P retention by dewatered waterworks sludges. Environmental Technology & Innovation 6 , pp. 38-48. 10.1016/j.eti.2016.05.002

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Abstract

Eutrophication caused by excess phosphorus (P) loading poses serious environmental risk to freshwater bodies around the world. Advancing our fundamental understanding towards practical reduction of this risk using novel industrial by-products as P adsorbents is the focus of this study. The study examined the combined effect of solution chemistry and the inherent properties of a novel adsorbent (dewatered waterworks sludges) on their P retention. The overall aim was to contribute to a mechanistic understanding of P retention by the sludges; and to better understand what properties regulate their P retention. Results confirm a strong but variable affinity for P by the sludges. Aluminium (Al)-based sludges generally had higher total specific surface areas; and tended to have higher P sorption capacities (6.09–26.95 mg-P/g) than iron (Fe)-based sludges (5.83–23.75 mg-P/g). In most cases, adsorption data was well fitted with the Freundlich model. However, data for two of the Al-based sludges was best described by the Langmuir model with very minimal leaching of Al, Calcium (Ca) and sulphate (SO42−) ions observed; indicating surface complexation via P binding into the Al hydr(oxide) as the main mechanism for these Al-based sludges.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TC Hydraulic engineering. Ocean engineering
Uncontrolled Keywords: Adsorption capacity; Aluminium sludges; Dewatered waterworks sludges; Ferric sludges; Phosphorus
Publisher: Elsevier
ISSN: 2352-1864
Date of Acceptance: 1 May 2016
Last Modified: 04 Jun 2017 09:14
URI: http://orca.cf.ac.uk/id/eprint/92528

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