Manure

Over the past couple of months, two situations within the world of animal nutrient management have come back into the limelight, forward movement of the EPA on monitoring air emissions from various agricultural facilities across the U.S. and a new look at who is actually required to obtain a discharge permit for CAFO operations. Neither development is going to change the face of agriculture today, but as information continues to flow, there is opportunity for change in the future.

When crude oil was $10 a barrel, the benefits cow power can provide to farms, communities and the environment were a blip on the radar. Now that crude oil has surpassed $70 a barrel, interest in renewable energy is on the rise. However, biogas recovery from anaerobic digestion still takes a backseat to ethanol and biodiesel in the limelight. Experts in the energy field are beginning to shift this focus, pointing out the multiple benefits of using waste to produce biofuels.

Ammonia used to be considered only as a nuisance odor emitted by dairies and other livestock operations. Now, ammonia is known to react with atmospheric nitric and sulfuric acids to form fine particulate matter (known as PM2.5), which is a major contributor to smog production.

Dairy farms are thought to emit large amounts of ammonia, therefore contributing to nitrogen (N) fertilization of natural ecosystems and providing precursors for particulates that adversely affect air quality and human health. The 2003 National Research Council report Air Emissions from Animal Agriculture made an urgent call for processed-based research to assist livestock producers and regulatory agencies in developing strategies that reduce the emissions of ammonia and other gasses that impair air quality.

Designing a new manure-handling facility is sometimes easier than improving an existing nutrient management facility, but there are some basic components that need to be included in any good manure-handling system. The operation and maintenance of the system needs to be considered at the time of design.

Editor’s note: The following is the first installment of a four-part series summarizing fact sheets written by Wendy Powers entitled “The Power of Smell.”