Agricultural and Biosystems Engineering Publications

Campus Units

Agricultural and Biosystems Engineering, Animal Science

Document Type

Article

Publication Version

Published Version

Publication Date

2009

Journal or Book Title

Applied Engineering in Agriculture

Volume

425

Issue

430

First Page

425

Last Page

430

DOI

10.13031/2013.26894

Abstract

Forced precipitation of struvite (MgNH4PO4 . 6H2O) can reduce dissolved reactive phosphorus (DRP) in swine manure slurries. Optimization of this process requires that the swine manure slurry pH be increased, that magnesium be added, and that sufficient reaction time be allowed for struvite precipitation. To gather data that could be used for a full-scale continuous-flow struvite precipitation reactor, a bench-scale (14-L) continuous flow reactor was designed, constructed, and tested. The bench-scale reactor used air sparging for both pH adjustment and mixing, used a peristaltic pump to continuously inject magnesium chloride (MgCl2 . 6H2O), and was operated at a 10-min hydraulic retention time. The bench-scale system provided a 95% reduction of DRP in swine manure slurry collected from a concrete storage tank with a permeable cover, and a 78% reduction of DRP in swine manure slurry collected from a shallow under floor pit collection system. A bench-scale up-flow clarifier was designed, constructed, and tested for continuous flow separation of the precipitated struvite in order to provide total phosphorus (TP) removal. The up-flow clarifier was unable to continuously settle struvite particles formed in the bench-scale reactor and provided no significant TP removal through the system. The implication of this work for full-scale systems is discussed.

Comments

This article is from Applied Engineering in Agriculture, 25, no. 3 (2009): 425–430.

Access

Open

Copyright Owner

American Society of Agricultural and Biological Engineers

Language

en

File Format

application/pdf

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