Optimization of phosphorus precipitation from swine manure slurries to enhance recovery.
Water Sci Technol
; 48(1): 139-46, 2003.
Article
in En
| MEDLINE
| ID: mdl-12926630
ABSTRACT
Laboratory experiments were conducted using magnesium chloride (MgCl2 x 6H2O, 64% solution) to force the precipitation of phosphorus and reduce the concentration of soluble phosphorus (PO4(3-)) in two swine wastes. One of the swine wastes tested contained a high concentration of PO4(3-) (initially approximately 1,000 mg/L), and the other swine waste tested contained a low concentration of PO4(3-) (initially approximately 230 mg/L). The precipitation reactions were performed to determine the required reaction time, pH, magnesium addition rate and seed material for future precipitate recovery work. For the high and low concentration waste, a 10-minute reaction time at a pH of 8.6 was sufficient to remove 98 and 96% of the PO4(3-) from solution. A molar ratio of Mg2+PO4(3-) of 1.61 was determined to be effective for PO4(3-) removal from both the low and high strength wastes. At a molar ratio of 1.61, the PO3- in the high concentration waste was reduced from 590 to 12 mg/L. In the low concentration waste, the PO4(3-) concentration was reduced from 157 to 15 mg/L. Seeding the reaction did not significantly enhance the recovery process.
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Collection:
01-internacional
Health context:
2_ODS3
Database:
MEDLINE
Main subject:
Phosphorus
/
Waste Disposal, Fluid
/
Conservation of Natural Resources
/
Manure
Limits:
Animals
Language:
En
Journal:
Water Sci Technol
Year:
2003
Document type:
Article