title: Phosphorus recovery from pig manure solids prior to land application.
abstract: Land disposal of pig manure is an environmental concern due to an imbalance of the nitrogen to phosphorus (N:P) ratio for crop production, leading to excess phosphorus (P) in soils and potential risks of water pollution. A process called "quick wash" was investigated for its feasibility to extract and recover P from pig manure solids. This process consists of selective dissolution of P from solid manure into a liquid extract using mineral or organic acid solutions, and recovery of P from the liquid extract by adding lime and an organic polymer to form a P precipitate. Laboratory tests confirmed the quick wash process selectively removed and recovered up to 90% of the total (TP) from fresh pig manure solids while leaving significant amounts of nitrogen (N) in the washed manure residue. As a result of manure P extraction, the washed solid residue became environmentally safer for land application with a more balanced N:P ratio for crop production. The recovered P can be recycled and used as fertilizer for crop production while minimizing manure P losses into the environment.
authors: USDA-ARS Coastal Plains Soil, Water, and Plant Research Center, 2611 W. Lucas Street, Florence, 29501, SC, USA. Electronic address: ariel.szogi@ars.usda.gov.
authors: Ariel A
authors: AA
authors: Szögi
authors: USDA-ARS Coastal Plains Soil, Water, and Plant Research Center, 2611 W. Lucas Street, Florence, 29501, SC, USA.
authors: Matias B
authors: MB
authors: Vanotti
authors: USDA-ARS Coastal Plains Soil, Water, and Plant Research Center, 2611 W. Lucas Street, Florence, 29501, SC, USA.
authors: Patrick G
authors: PG
authors: Hunt
mesh_terms: D000383:Agriculture; D000818:Animals; D005308:Fertilizers / Q000032:analysis*; D008372:Manure / Q000032:analysis*; D009584:Nitrogen / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D013552:Swine; D014876:Water Pollution / Q000517:prevention & control*
chemical_list: D005308:Fertilizers; D008372:Manure; D012989:Soil Pollutants; D010758:Phosphorus; D009584:Nitrogen
keywords: Animal waste; N:P ratio; Nitrogen; Nutrient recovery; Phosphorus; Pig manure