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American Society of Agronomy
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Nitrogen Cycling and Anaerobic Lagoons

Study examines the molecular biology of nitrogen cycling in anaerobic lagoons in large-scale swine production

Swine houses and lagoonMADISON, WI MARCH 4, 2011 – North and South Carolina have seen a steady increase in swine production over the last 15 years. In North Carolina alone, swine production generates approximately a quarter of the state’s gross farm receipts. The presence of so many large-scale pig farms leads to the problem of proper animal waste disposal.

 
The most common practice in the Carolinas is storing animal waste in anaerobic lagoons. They are primarily used to concentrate and passively treat urine and feces but due to the widespread use of this practice, the envrionmental impacts should be considered. Conflicting reports implicate lagoon sites to be responsible for high emission rates of nitrogen gas and volatized ammonia.
 
A team of ARS-USDA scientistsexamined a series of commercial, anaerobic, swine wastewater lagoons in North and South Carolina for genes involved in the nitrogen cycling process. Nitrification and denitrification are the parts of the process responsible for turning ammonia into nitrogen gas. After analyzing eight lagoons and measuring the abundance of four nitrogen cycling genes, researchers concluded that the denitrifying and nitrifying organisms were active, though at very low amounts, despite there being a high number present. Acidification and eutrophication of the surrounding ecosystem could be the result of prolonged exposure to volatilized ammonia.
 
Thomas F. Ducey, one of the authors of the study says, “These anaerobic lagoons have relatively consistent levels of nitrogen-cycling genes throughout their water column. While they are similar to natural ecosystems, they are not as high as some wastewater treatment system. Moreover, these gene levels did not translate into the high denitrification enzyme activity that is typical of wastewater treatment systems.”
Ducey adds, “The work is part of the ARS Agricultural and Industrial Byproducts National Program, which has the mission to effectively and safely manage and use manure and other agricultural and industrial byproducts in ways that maximize their potential benefits while protecting the environment and human and animal health.”
 
Research is continuing to help agricultural and scientific communities further understand the microbial ecology and nutrient cycling in anaerobic lagoons. The full study can be found in the March/April 2011 issue of the Journal of Environmental Quality.

 

Journal of Environmental Quality publishes original research, reviews and analyses, and environmental issue articles that address anthropogenic impacts on water, soil, and the atmosphere and pertain to some aspect of environmental quality in natural and agricultural ecosystems.

The American Society of Agronomy is an international scientific and professional society with its headquarters in Madison, WI. Our members are researchers and trained, certified professionals in the areas of growing our world’s food supply, while protecting our environment. We work at universities, government research facilities and private businesses across the United States and the world.