Poultry Digestion – Emerging Farm-Based Opportunity

While EPA AGSTAR has long supported the adoption of anaerobic digestion on dairies and swine farms, they have not historically focused on the use of anaerobic digestion on egg laying and other poultry facilities. This has been because the high solids and ammonia concentrations within the manure make anaerobic digestion in a slurry-based system problematic.…

Effects of Mixing Duration on Biogas Production and Methanogen Distribution in Dairy Manure Anaerobic Digesters

Why Did We Study Mixing Duration?

Mixing is an important parameter for anaerobic digesters for both design and operation. This is especially true for digesters that treat diary manure, which is a mixture of feces, urine, blood, food wastes, and bedding. Many of the solids fed to the digester have no or low degradability, and some of the large fibers can clog pumps or pipes in the transfer system.…

Low Tech Waste to Energy Applications in Developing Countries


Abstract

Animal waste is fully utilized in most developing countries, particularly in Afghanistan, Pakistan and Sri Lanka.  Utilization of animal waste for energy, cooking and heating is often of greater importance than use for soil conditioning and fertilization.  The simplest processing of manure, including gut waste from slaughter operations, is to sun-dry the material which is then burned in small, efficient clay burners. …

Innovative Technologies for Managing Manure (Part 2): A National Challenge to find affordable ways to recover nutrients from manure


Purpose of the Panel:

What if there was a technology that could capture all the phosphorus in livestock manure and turn it into lightweight fertilizer? What if farmers could not only afford this technology, but they would buy it because they could then sell the fertilizer? What if you came up with an idea for such a technology that could then get piloted at one of the largest farms in the country?

Measuring Nitrous Oxide and Methane Emissions from Feedyard Pen Surfaces; Experience with the NFT-NSS Chamber Technique

Why Study Nitrous Oxide and Methane at Cattle Feedyards?

Accurate estimation of greenhouse gas emissions, including nitrous oxide and methane, from open beef cattle feedlots is an increasing concern given the current and potential future reporting requirements for GHG emissions. Research measuring emission fluxes of GHGs from open beef cattle feedlots, however, has been very limited.…

Ciprofloxacin residues in biosolids compost do not selectively enrich populations of resistant bacteria

Biosolids and livestock manure are valuable high-carbon soil amendments, but they commonly contain antibiotic residues that might persist after land application. While composting reduces the concentration of extractable antibiotics in these materials, if the starting concentration is sufficiently high then remaining residues could impact microbial communities in the compost and soil to which these materials are applied.…

Calcium Enhanced Precipitation Of Swine Manure: Supporting Concepts And Lab Scale Trial Findings


Can Solid and Liquid Manure Fractions Be Treated to Enhance Nutrient Management?

An important consideration of liquid manure solids separation is the fate and economic value of the resulting liquid and solids fractions. The desired properties of the separated fractions, operator preferences, regulatory considerations, and economics should determine the type and degree of treatment.…