How Can Algae Be Used to Manage Nutrients in Pig Manure?

green stylized pig logoUsually when people see the words “algae” and “manure” in the same paragraph, it is usually a negative take on the effects of manure nutrients on water. When excess nutrients are transported to water bodies (from lawn fertilizer, municipal waste treatment plants, manure and/or commercial crop fertilizer) algae use those nutrients and grow rapidly.…

Does Manure Solid-Liquid Separation Reduce Greenhouse Gas Emissions on Swine Farms?

green stylized pig logoThere is some research suggesting that separating swine manure into solids and liquids can slightly reduce greenhouse gas (GHG) emissions emitted from the manure itself. It is not likely to be significant enough for separation to be a viable strategy by itself.

The primary reason to use solid-liquid manure separation is to prepare manure for further treatment in a system that can:

  1. generate energy (such as anaerobic digestion, thermal technologies, etc.)

What Is Gasification of Manure?

green stylized pig logoWhen looking at ways to improve the environmental impact of pig production, renewable energy generation is a popular topic. One such technology, gasification, is a series of chemical reactions (see image at bottom) that involve heating a suitable organic material in a controlled, low-oxygen environment to the point that the hydrocarbons (simple organic compounds that contain only hydrogen and carbon) are converted to synthesis gas (‘syngas’).…

Carbon Footprint, Life Cycle Assessment and the Pork Industry

green stylized pig logoAnimal agriculture in the U.S. contributes approximately 3.5% of all man-made greenhouse gases (GHGs). If you look at pork production, it accounts for just 0.34% of all emissions. (Source: U.S. EPA Greenhouse Gas Inventory released April, 2015).

When you total up all the GHG emissions from a particular activity or process, it is called a carbon footprint.

What Greenhouse Gases Are Emitted by Pig Farms?

green stylized pig logoIn 2014, all man-made sources of greenhouse gas (GHG) emissions in the U.S. were estimated to be 6,870.5 MMT CO2e (millions of metric tons carbon dioxide equivalent). Agriculture was estimated to be responsible 8.3% of those emissions (573.6 MMT CO2e per year). When looking specifically at animal agriculture, all different species together emit an estimated 243.4 MMT CO2e/year, which is 3.5% of all U.S.…