Ammonia Point Sensor for Intensive Livestock Operations
USDA Phase II SBIR Contract 2007-33610-18557
Research and development is being conducted at Eltron to produce a sensitive, reliable and cost-effective monitor for ammonia emissions in confined animal feeding operations (CAFOs). CAFOs have become a major form of animal production. There is increased concern over emissions from confinement houses and the health effects of emissions on workers and animals. The CAFO industry needs reliable monitoring solutions to support manure management and sustain competitiveness.
In previous research, we demonstrated a unique colorimetric sensor system capable of monitoring ammonia continuously from less than 1 ppm to 100s of ppm. The maximum sensitivity of this monitor was between 0–50 ppm NH3, but a linear response with reduced sensitivity up to 300 ppm was found. Negligible or minor interference from carbon dioxide, methane and hydrogen sulfide were observed. The sensor functioned well in highly humid and dusty environments. We demonstrated sensing with breadboarded components comparable to those to be used in subsequent research. One to two ppm ammonia was readily monitored, with positive response in under 2 seconds. Detection limits were on the order of 0.5 ppm.
During current research, we will complete polymer sorbent film and develop a prototype. A field-testable prototype unit will be fabricated and tested in the lab and under live CAFO conditions in cooperation with USDA ARS staff in Fayetteville, AR.
The primary focus of the program is the CAFO industry, where cost-effective tools are needed to meet emerging regulations and to boost profitability. Ammonia leak detection in commercial refrigeration environments is another key area to which this technology will be applied.