The Scientific Basis for Estimating Air Emissions from Animal Feeding Operations Interim Report (2002) / Chapter Skim
Currently Skimming:
Executive Summary
Executive Summary
Pages 1-6
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 1... ...
The chemical composition of the emissions varies depending on animal species, feeding regimes and practices, manure management practices, and the way in which the animals are housed. Much of the air emissions come from the storage and disposal of the manure (the term here is used to mean both urine and feces, and may also include litter or bedding materials)
|
From page 2... ...
This interim report is intended to provide findings to date on a series of specific questions from EPA regarding the following general issues: identifying the scientific criteria needed to ensure that estimates of air emission rates are accurate, the basis for these criteria in the scientific literature, and the uncertainties associated with them. It also includes an assessment of the emission estimating approaches in a recent report Air Emissions From Animal Feeding Operations (EPA, 2001a)
|
From page 3... ...
Finding 1: Proposed EPA regulations aimed at improving water quality may affect rates and distributions of air emissions from animal feeding operations. Discussion: Regulations aimed at protecting water quality would probably affect manure management at the farm level, especially since they might affect the use of lagoons and the application of manure on cropland or forests.
|
From page 4... ...
to meet its December 2002 deadline for proposing regulations under the Clean Water Act. Finding 2: In order to understand health and environmental impacts on a variety of spatial scales, estimates of air emissions from AFOs at the individual farm level, and their dependence on management practices, are needed to characterize annual emission inventories for some pollutants and transient downwind spatial distributions and concentrations for others.
|
From page 5... ...
and climatic differences, daily and seasonal weather cycles, animal life stages, management approaches (including manure management practices and feeding regimes) , and differences in state regulations are not adequately considered.
|
From page 6... ...
Finding 8: A process-based model farm approach that incorporates "mass balance" constraints for some of the emitted substances of concern, in conjunction with estimated emission factors for other substances, may be a useful alternative to the model farm construct defined by EPA (2001a)
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.