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Presentation
Development of an Air Sparged Continuous Flow Reactor for Struvite Precipitation from Two Different Liquid Swine Manure Storage Systems
Agricultural and Biosystems Engineering Conference Proceedings and Presentations
  • Timothy A. Shepherd, Iowa State University
  • Robert T. Burns, Iowa State University
  • Lara B. Moody, Iowa State University
  • D. Raj Raman, Iowa State University
  • Kenneth J. Stalder, Iowa State University
Document Type
Conference Proceeding
Conference
International Symposium on Air Quality and Waste Management for Agriculture
Publication Date
9-16-2007
DOI
10.13031/2013.23822
Geolocation
(39.9205411, -105.0866504)
Abstract

Forced precipitation of struvite (MgNH4PO4*6H2O) has been demonstrated to be an effective method to reduce dissolved reactive phosphorus (DRP) from swine manure. The development of a robust and flexible continuous flow struvite precipitation reactor is essential to the application of this method to modern livestock operations. Swine manure generally requires pH adjustment, magnesium amendment and a sufficient reaction time to create optimum conditions for struvite precipitation. A bench-scale (14-L) continuous flow reactor was developed to force struvite precipitation and reduce DRP. The bench scale system was developed to quantify system performance prior to building a much larger pilot-scale unit. The bench-scale reactor used air sparging to provide pH adjustment and mixing. Influent manure slurry was continuously amended with magnesium chloride (MgCl2 . 6H2O) to promote maximum DRP removal. During continuous flow operation, a 10-minute hydraulic retention time was provided for struvite precipitation. This paper discusses the design and development of the continuous flow air sparged tank reactor (ASTR) and reports on the reactor's DRP reduction capabilities on manure collected from two commercially utilized swine manure storage systems; 1) a concrete storage tank with a permeable cover, and 2) a shallow under floor pit manure collection system. Continuous flow ASTR treatment provided a 95% reduction of DRP from the covered storage tank manure and a 78% reduction of DRP from the under floor pit manure.

Comments

This proceeding is from CD-Rom Proceedings of the International Symposium on Air Quality and Waste Management for Agriculture, 16–19 September 2007 (Broomfield, CO): ASABE Publication No. 701P0907cd.

Copyright Owner
American Society of Agricultural and Biological Engineers
Language
en
Citation Information
Timothy A. Shepherd, Robert T. Burns, Lara B. Moody, D. Raj Raman, et al.. "Development of an Air Sparged Continuous Flow Reactor for Struvite Precipitation from Two Different Liquid Swine Manure Storage Systems" Broomfield, CO(2007)
Available at: http://works.bepress.com/raj_raman/20/