title: Recovery of ammonia from swine manure using gas-permeable membranes: effect of aeration.
abstract: The gas-permeable membrane process can recover ammonia from manure, reducing pollution whilst converting ammonia into an ammonium salt fertilizer. The process involves manure pH control to increase ammonium (NH4(+)) recovery rate that is normally carried out using an alkali. In this study a new strategy to avoid the use of alkali was tested applying low-rate aeration and nitrification inhibition. The wastewater used was raw swine manure with 2390 mg NH4(+)-N/L. Results showed that aeration increased pH above 8.5 allowing quick transformation of NH4(+) into gaseous ammonia (NH3) and efficient recovery by permeation through the submerged membrane. The overall NH4(+) recovery obtained with aeration was 98% and ammonia emissions losses were less than 1.5%. The new approach can substitute large amounts of alkali chemicals needed to obtain high NH4(+) recovery with important economic and environmental savings.
authors.affiliation: Agriculture Technological Institute of Castilla and León (ITACyL), Valladolid, Spain. Electronic address: gargonmi@itacyl.es.
authors.forename: M C
authors.initials: MC
authors.lastname: García-González
authors.affiliation: USDA-ARS Coastal Plains Soil Water, and Plant Research Center, Florence, SC, USA.
authors.forename: M B
authors.initials: MB
authors.lastname: Vanotti
authors.affiliation: USDA-ARS Coastal Plains Soil Water, and Plant Research Center, Florence, SC, USA.
authors.forename: A A
authors.initials: AA
authors.lastname: Szogi
mesh_terms: D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control*; D000641:Ammonia / Q000737:chemistry*; D000818:Animals; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005308:Fertilizers / Q000032:analysis*; D008372:Manure / Q000032:analysis*; D013552:Swine
chemical_list: D000393:Air Pollutants; D005308:Fertilizers; D008372:Manure; D000641:Ammonia
keywords: Aeration effect; Ammonia recovery; Gas-permeable membranes; Nutrient recovery; Swine manure