Surface Complexation Modelling and Aluminum Mediated Phosphorus  White Paper

NUTR1R06r

Currency:

Standard price: £29.00

Available as an ebook

Please purchase via www.iwaponline.comOpens in new window

Also part of Water Intelligence Online Digital Reference Library

Standard ePrice: £29.00

+ VAT

Access ebook

Author(s): D. Scott Smith

Publication Date: 27/04/2015

Pages: 20

ISBN13: 9781780406848

eISBN: 9781780406848

Download book flyer Print page

 

Nutrient removal, specifically phosphorus, is an important objective during wastewater treatment. Chemically mediated phosphorus involves adding metal salts (Al3+, Fe2+, Fe3+) and removing the resultant solid phase via solid liquid separation techniques. The mechanism for phosphorus, and in particular phosphate, to partition into the solid phase is not definitively known for aluminum mediated removal. Here, the researchers test a conceptual surface complexation modeling framework, originally developed for ferric mediated removal. It is found that the same model framework as describes ferric experiments also works for aluminum experiments. The magnitude of the surface reactions (logK values) are different for the two models, but the same types of surface reaction stoichiometries describe data for phosphate removal batch tests using both cations (ferric and aluminum). Thus, in an equilibrium sense, aluminum and ferric phosphate removal chemistries are similar, but this is not true from a kinetic experiment. In previous ferric experiments, it was found that the surface complexation reaction involved a fast first step (minutes) followed by a slow second step (at least 24 hours for equilibration), but for aluminum the removal of phosphate is essentially instantaneous (on the order of seconds).

Also available as part of your Water Inteligence Online subscription

D. Scott Smith

The latest from @IWApublishing

Don't miss out on three compelling documentaries on the water industry set to showcase during the Digital World Wat… https://t.co/jQdqgQxPFA 7 hours 17 min ago
Most downloaded in Utilities/Networks: free to read! - https://t.co/MT7OxlmrqA https://t.co/V3JUf7XmwE 4 days 3 hours ago
Discover April's most downloaded articles in topics of Urban Water: free to read! - https://t.co/KxK4dnNVcP https://t.co/c0CDof0OhC 5 days 9 hours ago