title: Precipitation of swine and cattle manure phosphorous using limestone dust.
abstract: The effectiveness of SPS and PULPRO, fine limestone dusts, in precipitating swine and dairy manure phosphorous (P) was determined in the laboratory. Both manures were sieved before being treated with limestone, to reproduce the treatment of mechanically separated manure and to observe the precipitation effect of limestone without that of the large manure solid particles. P precipitation was optimized by varying precipitation conditions (propeller blade speeds, mixing time and limestone levels) and limestone particle size. P precipitation was optimized using a propeller blade mixing speed of 0.3 m s(-1) for at least 5 minutes, using 3% limestone (dry limestone mass over wet manure mass). In terms of particle size, PULPRO 20 (limestone with a particle size of 0.02 mm) produced the most P precipitation and the smallest volume and mass of sludge, as compared to PULPRO 10, PULPRO 3 and SPS (limestone with a particle size of 0.01, 0.003 and 0.3 to 0.003 mm, respectively). For both 9.5% TS (total solids) dairy and 8.8% TS swine manure, mechanical separation followed by limestone precipitation concentrated 90% of manure TS and TP in a sludge volume representing 45% of the initial raw manure mass.
authors.affiliation: Department of Agricultural and Biosystems Engineering, McGill University, Ste Anne de Bellevue, Quebec, Canada. barrington@macdonald.mcgill.ca
authors.forename: Suzelle
authors.initials: S
authors.lastname: Barrington
authors.forename: Pascal
authors.initials: P
authors.lastname: Lesauteur
authors.forename: Mari
authors.initials: M
authors.lastname: Shin
authors.forename: Jean Bernard
authors.initials: JB
authors.lastname: Gélinas
mesh_terms: D000818:Animals; D002119:Calcium Carbonate / Q000737:chemistry*; D002417:Cattle; D004391:Dust; D008372:Manure; D010758:Phosphorus / Q000737:chemistry*; D013552:Swine
chemical_list: D004391:Dust; D008372:Manure; D010758:Phosphorus; D002119:Calcium Carbonate