A comparison of pig manure waste treatment technologies

Learn about composting vs. biogas vs. Freetilizer
calendar icon 2 November 2022
clock icon 3 minute read

The treatment of pig slurry requires careful consideration and management on each farm. The associated costs and the necessary logistical operations can have a big impact, stealing time and labor from your routine tasks on the farm. It is crucial to find quick and efficient methods of waste treatment, so pig producers have more time to devote to what is most important - taking care of their pigs.

The search for solutions can be a daunting task. In a world full of information, it is important to consider all the options available and their impact on the pig farm. After all, we can have multiple options but only one decision.

Usually, the treatment and recovery strategy involve separating the solid fraction and the liquid fraction from pig slurry. Thus, the solid fraction can be valued through composting as a fertilizer and the liquid fraction treated with ultrafiltration or reverse osmosis. A recent trend is to create economic value from pig slurry by adding woody materials to create biogas which is then turned into electrical energy. However, this path does not avoid the need to deal with both fractions (solid and liquid), it only reduces its nutritional value. Since the organic matter present in the pig slurry is transformed into methane and then burned for energy production, it makes the solid fraction depleted of nutrients and organic constitution. The liquid fraction becomes concentrated in chemical elements that are potentially dangerous for environmental disposal or too expensive for treatment.

We all know that there are no perfect solutions, but there are approaches designed to use the best of modern technology and knowledge to find a more balanced path.


Freetilizer is an innovative technology with a pending patent, based on a hydrolysis process that applies specific enzymes in a reactor with controlled agitation, pH and temperature, that creates new value for organic waste transforming them into organic fertilizers in less than 24 hours. The application of a separation process combined with Freetilizer technology presents excellent results for the valorisation of pig slurry. The liquid fraction becomes less concentrated in solids while maintaining nitrogen and potassium levels, while the solid fraction retains most of the organics, nitrogen and phosphorus. The procedure ends with an efficient drying step, using a vacuum drying process that enables water evaporation at lower temperatures which guarantees nutrient quality preservation and results in the formation of a stabilized product. The liquid fraction can be concentrated efficiently using the vacuum drying system until desired nutrient composition is reached.

The fact that there is no generation of any effluent to be discarded or treated, combined with the rich nutritional composition of the two products created, shows how Freetilizer is a differentiating technology from other treatment techniques.

The establishment of waste treatment technologies must be examined on a case-by-case basis, taking into account many different factors. Our aim is to work with you to develop the best valorisation opportunity based on the design and needs of your pig operation.

We are looking forward to your contact.

Pipe Masters / Freetilizer

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