An environmentally friendly approach to swine slurry processing

Hog mortar – the new “black gold”


calendar icon May 3, 2022

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3 minutes to read

Freetilizer is an innovative technology with a patent pending that creates new value for organic waste and by-products from the primary sector or food processing industry, converting them into organic fertilizers in less than 24 hours. The whole process is energy efficient, fast, compact and uses all resources with a zero waste approach.

Learn more about how the Freetilizer process works:

1 – Pig breeding

The increase in the world’s population has led to a rise in the demand for food production. To meet this high demand, animal production systems have shifted from extensive to intensive activity, resulting in the production of large quantities of animal slurry. An urgent demand has arisen for alternative treatment approaches to deal with the excess nutrients present in pig slurry, deteriorating surrounding water resources, greenhouse gas emissions, and unpleasant odors.

2 – slurry pig

Various strategies have been proposed to treat slurries, facilitate their management, and reduce their environmental impact: acidification, additives, solid-liquid separation, biological processes (aerobic or anaerobic), and heat treatment. Although these processes can make products with potential as fertilizers, they are time consuming and most of them are costly methods due to their high energy inputs. Given the large amounts of animal slurry produced daily, the speed of the curing procedure is of paramount importance. Appropriate management of animal slurry should feature efficient, economically feasible and environmentally friendly treatment. Moreover, it should involve the valorization of slurry, contributing to the generation of value-added products that may contribute to the sustainability of the agricultural sector, and integrating it into the concept of circular economy.

3 – Fretilizer Technology

Freetilizer is an innovative technology with patent pending, based on a hydrolysis process that applies specific enzymes in a reactor with controlled stirring, pH and temperature and creates new value for organic waste, converting it into organic fertilizer in less than 24 hours. The application of the separation process combined with the Freetilizer technology provides excellent results for the estimation of pig slurry.

Separating the pig slurry into a solid and liquid fraction allows the farmer to extract value from both parts and at the same time represents an inexpensive treatment option. The liquid part becomes less concentrated in the solids that preserve nitrogen and potassium. The solid part retains most of the organic matter, nitrogen and phosphorous. The application of enzymatic digestion to the solid fraction increases the bioavailability of nutrients. The procedure ends with an efficient drying step, using a vacuum drying process that allows water to be evaporated at lower temperatures ensuring that the quality of the nutrients is maintained and leads to the formation of a stable product. Therefore, the solid part can be transported more efficiently over longer distances for the use of fertilizer crops in arable areas. The liquid fraction can be efficiently concentrated using a vacuum drying system until the desired nutrient composition is obtained which can be used directly on the farm or distributed for commercial purposes. To our knowledge, this is the first time that a two-way valuation pathway for swine slurry management has been proposed, using a strategy that promotes the integration of pig farming into a circular economy concept.

4 – organic fertilizer

The use of treated pig slurry as a soil fertilizer remains an obvious and attractive solution to reduce the environmental impact of this waste, as well as reducing reliance on mineral fertilizers which have a high environmental footprint. The nutritional composition of both products obtained using the Freetilizer technology is another distinguishing factor from other treatment techniques. While solid fertilizers are rich in phosphorous and are one of nature’s most limited nutrients, liquid fertilizers have a high content of soluble organic matter which makes it possible to distribute the nutrients by fertilization irrigation.

5 – Sales

From a financial point of view, there will be a direct benefit to the agro-food industry, which will now be able to take advantage of the waste part, which will make it possible to amortize the investment in a short period of time and ensure economic sustainability.

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