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Article
Performance of a Pilot-Scale Air Sparged Continuous Flow Reactor and Hydrocyclone for Struvite Precipitation and Removal from Liquid Swine Manure
Applied Engineering in Agriculture
  • 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
Article
Publication Date
1-1-2009
DOI
10.13031/2013.26329
Abstract
The objective of this research was to test a pilot-scale air sparged tank reactor (ASTR) and the ASTR in combination with a hydrocyclone (called the pilot-scale ASTR-hydrocyclone system) on two swine manure slurries for struvite-based (MgNH4PO4-6H2O) phosphorus removal and recovery. The pilot-scale ASTR system operated at flow rates of 80 to 115 L/min and was based on the bench-scale design from Shepherd et al. (2007). The ASTR effluent was processed using a hydrocyclone separator for struvite separation and total phosphorus (TP) recovery. The pilot-scale ASTR-hydrocyclone system provided a 92% reduction of dissolved reactive phosphorus (DRP) in manure slurry from a swine finishing facility concrete storage tank and a 91% reduction of DRP in manure slurry collected from a swine finishing facility deep-pit under floor collection system. The pilot-scale ASTR-hydrocyclone system removed 18% of TP in swine manure from a concrete storage tank and 9% to 14% of TP in swine manure slurry from a deep-pit under floor collection system. The low TP recovery was attributed to the hydrocyclones inability to provide effective struvite separation as operated. Full-scale economics and implementation of the tested struvite-based phosphorus removal is discussed. A case study of a typical Iowa deep-pit swine production facility (10,000 head/year) indicated that the annual cost of struvite-based phosphorus removal using this system would be approximately $8.88/finished pig or $0.035/L manure slurry treated ($ 0.134/gal). This cost often exceeds producer's profit margins; this indicates that struvite-based phosphorus removal using this ASTR-hydrocyclone system in swine finisher manure slurries is not currently economically viable.
Comments

This article is from Applied Engineering in Agriculture, 25, no. 2 (2009): 257–267.

Copyright Owner
American Society of Agricultural and Biological Engineers
Language
en
Date Available
2012-12-07
File Format
application/pdf
Citation Information
Timothy A. Shepherd, Robert T. Burns, Lara B. Moody, D. Raj Raman, et al.. "Performance of a Pilot-Scale Air Sparged Continuous Flow Reactor and Hydrocyclone for Struvite Precipitation and Removal from Liquid Swine Manure" Applied Engineering in Agriculture Vol. 25 Iss. 2 (2009) p. 257 - 267
Available at: http://works.bepress.com/raj_raman/6/