RT info:eu-repo/semantics/article
T1 Effect of the type of gas-permeable membrane in ammonia recovery from air
A1 Soto Herranz, María
A1 Sánchez Báscones, Mercedes
A1 Antolín Rodríguez, Juan Manuel
A1 Conde Cid, Diego
A1 Vanotti, Matias
K1 Ammonia
K1 Amoniaco
K1 Air pollution
K1 Aire - Contaminación
AB Animal production is one of the largest contributors to ammonia emissions. A project, “Ammonia Trapping”, was designed to recover gaseous ammonia from animal barns in Spain. Laboratory experiments were conducted to select a type of membrane most suitable for gaseous ammonia trapping. Three types of gas-permeable membranes (GPM), all made of expanded polytetrafluoroethylene (ePTFE), but with different diameter (3.0 to 8.6 mm), polymer density (0.45 to 1.09), air permeability (2 to 40 L·min−1·cm2), and porosity (5.6 to 21.8%) were evaluated for their effectiveness to recover gas phase ammonia. The ammonia evolved from a synthetic solution (NH4Cl + NaHCO3 + allylthiourea), and an acidic solution (1 N H2SO4) was used as the ammonia trapping solution. Replicated tests were performed simultaneously during a period of 7 days with a constant flow of acidic solution circulating through the lumen of the tubular membrane. The ammonia recovery yields were higher with the use of membranes of greater diameter and corresponding surface area, but they were not affected by the large differences in material density, porosity, air permeability, and wall thickness in the range evaluated. A higher fluid velocity of the acidic solution significantly increased—approximately 3 times—the mass NH3–N recovered per unit of membrane surface area and time (N-flux), from 1.7 to 5.8 mg N·cm−2·d−1. Therefore, to optimize the effectiveness of GPM system to capture gaseous ammonia, the appropriate velocity of the circulating acidic solution should be an important design consideration.
PB MDPI
SN 2076-3298
YR 2019
FD 2019
LK https://uvadoc.uva.es/handle/10324/55982
UL https://uvadoc.uva.es/handle/10324/55982
LA eng
NO Environments, 2019, vol. 6, n. 6, 70
NO Producción Científica
DS UVaDOC
RD 04-dic-2024