Ecological approach to the treatment of pig manure

Pig manure – the new “Black Gold”

May 3, 2022

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3 minute read

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

Learn more about how the Freetilizer process works:

1 – Pig farming

The increase in world population has led to an increased demand for food production. To meet such demand, animal production systems have shifted from extensive to intensive activity, leading to the production of high volumes of animal manure. An urgent demand has arisen for alternative treatment approaches to deal with the excess nutrients found in pig manure, deterioration of surrounding water resources, greenhouse gas emissions and unpleasant odors.

2 – Pig manure

Different strategies have been proposed to treat manure, facilitate its management and reduce its environmental impact: acidification, additives, solid-liquid separation, biological processes (aerobic or anaerobic) and heat treatment. Although these processes can produce products with potential as fertilizers, they are time consuming and most are expensive methods due to their high energy input. Given the large volumes of animal manure produced daily, the speed of the processing procedure is of the utmost importance. Adequate management of animal manure must be characterized by efficient, economically viable and environmentally friendly treatment. In addition, this should lead to the recovery of slurry, contributing to the generation of value-added products that can contribute to the sustainability of the agricultural sector, integrating it into the concept of circular economy.

3 – Freetilizer Technology

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

Separating pig manure into a solid and liquid fraction allows a farmer to valorize both fractions and simultaneously represents an inexpensive processing option. The liquid fraction becomes less concentrated in solids keeping nitrogen and potassium. The solid fraction retains most of the organic matter, nitrogen and phosphorus. The application of enzymatic digestion to the solid fraction promotes an increase in the bioavailability of nutrients. The procedure ends with an efficient drying step, using a vacuum drying process that allows the evaporation of water at lower temperatures, which guarantees the preservation of the quality of the nutrients and results in the formation of a stable product. Therefore, the solid fraction can be transported more efficiently over longer distances for the use of fertilizer for crops in arable areas. The liquid fraction can be effectively concentrated using the 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 recovery path has been proposed for the management of pig manure, using a strategy that promotes the integration of pig farming into the concept of circular economy. .

4 – Organic fertilizer

The use of treated pig manure as soil fertilizer remains an obvious and attractive solution for reducing the environmental impact of this waste, as well as minimizing dependence on mineral fertilizers which have a strong ecological footprint. The nutritional composition of the two products obtained with the Freetilizer technology is another differentiating factor compared to other processing techniques. While solid fertilizer is high in phosphorus and is one of the most limiting nutrients in nature, liquid fertilizer has a high content of soluble organic matter allowing the nutrients to be distributed through fertigation.

5 – Sales

Financially, there will be a direct benefit for the agri-food industries, which will now be able to take advantage of the fraction of waste, making it possible to amortize the investment in a short time and ensure economic sustainability.

We look forward to your contact.

About Charles Holmes

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