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United States Department of Agriculture

Agricultural Research Service

Research Project: Assessing Atmospheric Emissions from Concentrated Animal Feeding Operations in the Pacific Northwest

Location: Northwest Irrigation and Soils Research

2013 Annual Report

1a. Objectives (from AD-416):
The purpose of this project is to address atmospheric emissions of trace gases from concentrated dairy operations and manure management systems. The goal is to develop emissions factors which will allow decision makers to evaluate the contribution of these constituents from dairy production with other agricultural and industrial sectors and assist in long-term planning efforts aimed at improving air quality and reducing emissions. Additionally, this project examines emissions of bioaerosols from dairy production facilities as well as airborne transport of pathogens during the reuse of dairy wastewater for crop irrigation. This information will be used to determine the potential for off site transport of bioaerosols and pathogens from dairy production, which is a community concern. The specific objectives and goals of the project are listed below (investigator involved and their time commitment). Objective 1. Determine emission rates of gases and bioaerosols from dairy operations. (Leytem 0.3, Dungan 0.2, Bjorneberg 0.2) • Research Goal 1.1. Estimate on-farm emissions of ammonia, methane, nitrous oxide, and carbon dioxide from dairy production facilities to determine emission factors that account for diurnal and seasonal fluctuations in emissions. • Research Goal 1.2. Compare gas monitoring equipment effects on estimates of ammonia and methane emissions. • Research Goal 1.3. Develop on-farm emissions factors for ammonia, methane, and nitrous oxide from dairy wastewater storage ponds based on wastewater characteristics, management practices, and climatic conditions. • Research Goal 1.4. Measure airborne concentrations of culturable bacteria, virus, and filamentous fungi and endotoxins downwind from a concentrated dairy operation to assess diurnal and seasonal variations. Objective 2. Utilize fecal contamination indicators to assess the downwind transport of pathogens in dairy wastewaters delivered via sprinkler irrigation systems. (Dungan 0.3, Leytem 0.2, Bjorneberg 0.1) • Research Goal 2.1. Assess the transport of aerosolized bacterial and viral pathogens generated during the land application of dairy wastewaters using sprinkler irrigation systems.

1b. Approach (from AD-416):
A year long study will determine the emissions of ammonia, methane, nitrous oxide, and carbon dioxide from the barns and wastewater storage pond of a large freestall dairy. Additionally, bioaerosol transport from the barns to downwind locations will be assessed. The emissions of ammonia, methane, and nitrous oxide from dairy liquid storage ponds will also be assessed in order to determine the factors affecting these emissions and develop better methods for predicting emissions from these systems. An assessment of the transport of pathogens from sprinkler irrigation of dairy wastewater will also be undertaken to determine the risk of pathogen drift to human receptors and potential health risks. A better understanding of the type and amount of constituents released into the air from animal production and manure storage areas are expected results. This information will allow us to develop emissions factors and assess the risk of pathogen drift from these systems.

3. Progress Report:
Significant progress has been made in 3 out of 4 objectives, all of which directly contribute to quantifying the extent of agricultural emissions of air pollutants. Under Objectives 1.1 and 1.4, emission factors for ammonia, methane, and nitrous oxide were developed for the housing area and wastewater storage ponds at a freestall dairy. The emission factors were subsequently published in a peer-reviewed journal. Under Objective 1.3, methane and nitrous oxide emissions are currently being monitored at two dairy production facilities, which will continue through the next fiscal year. Under Objective 2, substantial progress has been made using a model to estimate the dispersion and transport of bioaerosols generated during the spray irrigation of dairy wastewaters. A peer-reviewed publication on this topic is anticipated in FY 2014.

4. Accomplishments

Review Publications
Dungan, R.S., Klein, M., Leytem, A.B. 2012. Quantification of bacterial indicators and zoonotic pathogens in dairy wastewater ponds. Applied and Environmental Microbiology. 78(22):8089-8095.

Koehn, A.C., Leytem, A.B., Bjorneberg, D.L. 2013. Comparison of atmospheric stability methods for calculating ammonia and methane emission rates with WindTrax. Transactions of the ASABE. 56(2):763-768.

Miguel, R.E., Ippolito, J.A., Porta, A.A., Noriega, R.B., Dungan, R.S. 2013. Use of standardized procedures to evaluate metal leaching from waste foundry sands. Journal of Environmental Quality. 42(2):615-620.

Last Modified: 10/18/2017
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