Soto-Herranz María, Sánchez-Báscones Mercedes, Antolín-Rodríguez Juan Manuel, Martín-Ramos Pablo
Departamento de Ciencias Agroforestales, ETSIIAA, Universidad de Valladolid, Avenida de Madrid 44, 34004 Palencia, Spain.
Instituto Universitario de Investigación en Ciencias Ambientales de Aragón (IUCA), EPS, Universidad de Zaragoza, Carretera Cuarte s/n, 22071 Huesca, Spain.
Membranes (Basel). 2021 Nov 7;11(11):859. doi: 10.3390/membranes11110859.
Gas-permeable membrane (GPM) technology is a possible solution to reduce ammonia (NH) emissions from livestock housing. This paper presents the results obtained with an NH-capture prototype based on the use of expanded polytetrafluoroethylene (ePTFE) membranes in real conditions in a gestating sow house and a free-range laying hen house, comparing them with the results obtained in controlled laboratory conditions for the same type of waste. The NH present in the air of the livestock housing was captured by reaction with an acidic solution flowing inside the membranes. The periods of continuous operation of the pilot plant were 232 days at the pig farm and 256 days at the poultry farm. The NH recovery rate at the end of those periods was 2.3 and 0.4 g TAN·m·d in the pig and the poultry farms, respectively. The limiting factor for the capture process was the NH concentration in the air, with the highest recovery occurring in the most concentrated atmosphere. Differences in NH capture were observed between seasons and farms, with capture efficiencies of 1.62 and 0.33 g·m·d in summer and 3.85 and 1.20 g·m·d in winter for pig and poultry farms, respectively. The observed differences were mainly due to the higher ventilation frequency in the summer months, which resulted in a lower NH concentration inside the houses compared to the winter months. This is especially important when considering the real applicability of this technology. The results obtained suggest that GPM technology holds promise for limiting NH emissions from livestock housing with NH ambient concentrations close to 20 ppm or as part of manure storage facilities, given that it allows for recovery of nitrogen in a stable and concentrated solution, which can be used as a fertilizer.
透气膜（GPM）技术是一种减少畜禽舍氨气（NH₃）排放的可行解决方案。本文介绍了基于使用膨体聚四氟乙烯（ePTFE）膜的氨气捕获原型在妊娠母猪舍和散养蛋鸡舍的实际条件下获得的结果，并将其与在相同类型废弃物的受控实验室条件下获得的结果进行比较。畜禽舍空气中的氨气通过与膜内流动的酸性溶液反应而被捕获。中试装置在猪场连续运行232天，在禽场连续运行256天。在这些时间段结束时，猪场和禽场的氨气回收率分别为2.3和0.4 g TAN·m⁻²·d⁻¹。捕获过程的限制因素是空气中的氨气浓度，在最浓的气氛中回收率最高。在季节和养殖场之间观察到氨气捕获存在差异，猪场夏季和冬季的捕获效率分别为1.62和3.85 g·m⁻²·d⁻¹，禽场夏季和冬季的捕获效率分别为0.33和1.20 g·m⁻²·d⁻¹。观察到的差异主要是由于夏季月份通风频率较高，导致舍内氨气浓度低于冬季月份。在考虑该技术的实际适用性时，这一点尤为重要。获得的结果表明，GPM技术有望限制氨气环境浓度接近20 ppm时畜禽舍的氨气排放，或作为粪便储存设施的一部分，因为它能够在稳定且浓缩的溶液中回收氮，可作为肥料使用。
