Click on “Download PDF” for the PDF version or on the title for the HTML version.
If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.
Phosphorus Removal in a Novel Fluidized Bed Crystallizer
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 034123, 2003 ASAE Annual Meeting . (doi: 10.13031/2013.13879) @2003
Authors: Keith E. Bowers, Philip W. Westerman
Keywords: Phosphorus, wastewater, lagoon, struvite
The objective was to design and evaluate a crystallizer for economical removal of phosphorus from swine waste lagoon liquid. Methods used included (1) setting forth the main design elements; (2) modeling the behavior of a crystallizer with those elements; (3) using the model to specify the dimensions of a laboratory-scale crystallizer; (4) operating the laboratory-scale crystallizer to characterize its behavior at steady state and in factorial experiments to study variation in its performance; (5) comparing the behavior against model-predicted behavior; and (6) conducting factorial experiments with an on-site system to study variations in its performance. The results of the study showed that the laboratory-scale crystallizer achieved near-steady state with total phosphorus reduction slightly greater than expected and with a concentration profile close to that predicted by a model assuming plug flow of the liquid and perfect mixing of the bed. The laboratory-scale crystallizer exhibited greater phosphorus removal with increasing magnesium addition and increasing pH enhancement, but flow rate showed no significant effect. The on-site crystallizer exhibited similar variation in performance, except that decreasing flow rate was associated with greater removal. Removal of total phosphorus, including both dissolved and suspended phosphorus, reached 80-90% in the field system. This degree of removal implies that the system may be useful at commercial livestock operations where phosphorus content of the waste water needs to be significantly reduced.(Download PDF) (Export to EndNotes)