Recovery of ammonia and phosphate minerals from swine wastewater using gas-permeable membranes.
Gas-permeable membrane technology is useful to recover ammonia (NH3) from liquid manures. In this study, phosphorus (P) recovery via MgCl2precipitation was enhanced by combining it with NH3recovery through gas-permeable membranes. Anaerobically digested swine wastewater containing approximately 2300 mg NH4+-N L-1and 450 mg P L-1was treated using submerged membranes plus low-rate aeration to recover the NH3from within the liquid and MgCl2to precipitate the P. The experiments included a first configuration where N and P were recovered sequentially and a second configuration with simultaneous recovery. The low-rate aeration reduced the natural carbonate, increased pH and accelerated NH3uptake by the gas-permeable membrane system, which in turn benefited P recovery. Phosphorus removal efficiency was >90% and P recovery efficiency was about 100%. With higher NH3capture, the recovered P contained higher P2O5content (37-46%, >98% available), similar to the composition of the biomineral newberyite (MgHPO4·3H2O).
United States Department of Agriculture, Agricultural Research Service, Coastal Plains Soil, Water and Plant Research Center, 2611 W. Lucas St, Florence, SC 29501, USA. Electronic address: matias.vanotti@ars.usda.gov.
M B
MB
Vanotti
United States Department of Agriculture, Agricultural Research Service, Coastal Plains Soil, Water and Plant Research Center, 2611 W. Lucas St, Florence, SC 29501, USA.
P J
PJ
Dube
United States Department of Agriculture, Agricultural Research Service, Coastal Plains Soil, Water and Plant Research Center, 2611 W. Lucas St, Florence, SC 29501, USA.
A A
AA
Szogi
Agriculture Technological Institute of Castilla and Leon (ITACyL), Valladolid, Spain.
M C
MC
García-González
D000641:Ammonia / Q000737:chemistry*; D000818:Animals; D008372:Manure; D008903:Minerals; D010710:Phosphates; D010758:Phosphorus; D013552:Swine; D062065:Wastewater / Q000737:chemistry*
D000641:Ammonia; D008372:Manure; D008903:Minerals; D010710:Phosphates; D010758:Phosphorus; D062065:Wastewater
Ammonia recovery; Gas-permeable membranes; Livestock wastewater; Newberyite; Nutrient recovery; Phosphorus recovery