Impacts of New Phosphorous Regulations on Composting of Animal Manures

The Problem

Concerns are mounting in states that have sensitive waterways about the release of P from manure and compost into ground and surface water. P is the limiting nutrient for many freshwater ecosystems and as such regulate the rate of eutrophication and oxygen depletion. The concerns have led to new regulations that limit the application of manure and in some cases compost products that have high concentrations of P.  

PA Finishing Swine Barn Experience: Changing from Mortality Burial to a Michigan Style Composting Barn

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In the spring of 2014, the farmer with a 2020 finishing pig barn, wanted to change from burial of mortality to composting the mortality. We will document the change and the use of the composting barn from July 2014 to Dec 2016.

What did we do?

This 2020 finish pig barn space has about 3% mortality and expects about 250 deaths per year to compost.…

Composting Swine Slurry to Reduce Indicators and Antibiotic Resistance Genes


Over the last twenty years there have been considerable increases in the incidence of human infections with bacteria that are resistant to commonly used antibiotics. This has precipitated concerns about the use of antibiotics in livestock production. Composting of swine manure has several advantages, liquid slurries are converted to solid, the total volume of material is reduced and the stabilized product is more easily transported off-site.…

Antibiotic Losses during Thermophilic Composting


Residual antibiotics in land-applied manure and biosolids present a potential threat to public and ecological health, so it is important to determine antibiotic removal efficiencies for manure and biosolids waste management practices and to identify conditions that enhance antibiotic degradation.…

Benefits of Bedding Reuse for the Equine Industry

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Why Studying Bedding Reuse for Horses?

To examine the financial, operational and health benefits of re-using composted bedding in the equine industry.

What Did We Do?

Stable waste, consisting of manure, urine and wood shavings, is a readily compostable feedstock that generates heat and can be transformed into finished homogenous compost, which can be used as bedding for horses and other livestock. …

Measuring Greenhouse Gas and Nitrogen Gaseous Losses When Comparing Bulking Agents Used to Compost Separated Hog Solids

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Why Study Composting Separated Manure Solids?

This research is evaluating management options for conventional hog producing facilities in regions of Manitoba that will have insufficient land base for sustainably applying raw slurry manure when manure application regulations switch from nitrogen based to phosphorus based rates.…