Purdue to lead EPA air emissions study of Livestock Facilities
INDIANA - An animal agriculture clean air consortium selected a Purdue University agricultural engineer to lead a national $9 million study to help the U.S. Environmental Protection Agency establish air emissions standards for the livestock and poultry industries.
Dust, ammonia, hydrogen sulfide and other air emissions from animal
facilities are difficult to measure, making agricultural air quality an
issue as livestock operations consolidate and more people move from
cities to rural areas, said Al Heber, professor of agricultural and
biological engineering.
Heber will be the lead researcher for the two-year air study required
by the Animal Feeding Operation Consent Agreement, published Jan. 31 in
the Federal Register. Study protocols were developed jointly with
scientists from the EPA, U.S. Department of Agriculture, numerous
universities and others. Contract terms for the study are now being
reviewed.
Part of the difficulty with livestock air emissions is that limited
data exist to help farmers or regulatory agencies determine which kinds
and sizes of operations and types of management practices might produce
emissions exceeding legal limits, Heber said.
"Without good baseline data on emissions, we run the risk of having
regulations shaped by untimely political and societal pressures without
essential facts," he said. "The issues surrounding agricultural air
emissions are complex and affect many different stakeholders. We need
to discover how science can help develop fair and accurate air quality
regulations."
To conduct the study, Heber will recruit scientists from additional
universities and deploy monitoring teams with fully equipped mobile
labs. They will collect data at selected farms continuously over a
24-month period on particulate matter emissions, ammonia, hydrogen
sulfide and volatile organic compounds. Outdoor manure storage
facilities also will be monitored.
The mobile labs are trailers outfitted with gas analyzers, pollutant
detectors, weather stations and other equipment, which record data on
air samples drawn from various locations inside and outside livestock
facilities. Data also will be collected on animal size and number,
nutrient content of their diet and manure, climate, and routine farm
operations that might affect air emissions.
"What's unique about this study is that it will provide continuous,
long-term measurements of emissions coming from barns, plus periodic
measurements of lagoons and other manure storage facilities," Heber
said.
Mobile labs and manure storage monitoring will be established at egg,
swine, dairy, broiler hen and turkey facilities, and separate data sets
will be developed for each species. EPA officials will use the data to
help develop air emissions standards for the livestock industry.
"The EPA will be able to see how emissions change with time of day and
season in combination with other factors and incorporate that
information into the regulations the agency develops," he said.
"Studying emissions from existing commercial facilities is the best way
to gather data that will, in the long term, address air quality and
other environmental concerns."
Heber has led several studies of practices to control odor, gas and
dust emissions from livestock barns and waste storage facilities. He
runs one of the only odor labs in the United States and directs
Purdue's Agricultural Air Quality Laboratory.
As part of the project, Heber will create and maintain a Web site with
information to let the public know how the study is progressing. Odor
abatement will not be part of the national study.
Under this agreement, the Agricultural Air Research Council, a
non-profit entity, will fund the emissions monitoring research with
contributions from the National Pork Board, American Egg Board and
other sources.
The EPA regulates emissions of some air pollutants produced by
livestock facilities under the Clean Air Act (CAA); the Comprehensive
Environmental Response, Compensation and Liability Act (CERCLA), also
known as Superfund; and the Environmental Planning and Community
Right-to-Know Act (EPCRA).
Source: Purdue News Service - 3rd March 2005