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At SITRA we will explore how composted digestate can transform agriculture towards more sustainable practices.
We will discover how it benefits both the soil and the environment, reducing dependence on chemical fertilizers and improving water quality.
What is composted digestate?
El composted digestate It is a byproduct of the anaerobic digestion of organic waste, such as manure and crop residues.
The process takes place in biomethanization plants, where waste decomposes in the absence of oxygen, generating biogas and digestate. The digestate then undergoes a composting process to produce a high-quality organic amendment.
This process also allows you to obtain a fertilizerimproving soil performance naturally and reducing dependence on chemical fertilizers.
What are the objectives of composting?
The goal of composting is, among other things, the aerobic decomposition of organic matter present in waste and byproducts. Here we highlight three essential purposes:
- Health purpose: minimize the risk of pathogens.
- Environmental purpose: Transforming waste into a product necessary to close the carbon cycle in soils. This product must maintain the productive capacity of agricultural soils and improve productivity and efficiency in the use of nutrients, water, and temperature in soil-plant production systems.
- Commercial purpose: that it is a product suitable for marketing and introduction into the market.
Unlike other recycling processes, composting includes a thermophilic fermentation stage for sanitization, where a sufficient temperature is achieved for the sanitization and destruction of fecal pathogens (E. coli, salmonella), weed seeds, parasite cysts, etc.
As an input for soil improvement, the level of maturity and composition of transformed organic matter (humic and fulvic acids), as well as its capacity for soil formation and macronutrient composition (NPK), are important factors in its fertility and production.
Finally, reducing odors and humidity, as well as optimizing its physical appearance, are also objectives. This aims to ensure access to fertilizer markets under the best possible conditions, and to facilitate storage, dosing, and use with existing machinery.
What is the production process in biomethanization and biofertilizer plants?
The process of producing composted digestate involves several stages, from the collection of organic waste to its final composting.
The first phase includes preparing the waste for anaerobic digestion.
After the decomposition of organic matter in the anaerobic digester, the resulting material separates into liquid and solid phases. The solid digestate, after composting, it becomes a biofertilizer that can be applied in the field.
What are the agronomic benefits of composted digestate?
1. Provision of essential nutrients
Composted digestate is a rich source of vital plant nutrients, such as nitrogen, phosphorus, and potassium. The nutrients are released gradually, improving plant uptake and reducing leaching. This makes it a more efficient and environmentally friendly option.
2. Improvement of soil structure and water retention
The continued use of composted digestate significantly improves soil structure, increasing its water retention and aeration capacity. This is particularly important in areas with dry climates., where the soil's ability to retain water is crucial for maintaining crops.
3. Increased microbial activity and improved soil health
Composted digestate promotes microbial activity in the soil, which fosters the formation of stable aggregates and improves fertility. This activity is essential for the decomposition of organic matter, increasing the availability of nutrients for plants and thus improving soil health and crop yields.
Other benefits?
- Environmental impact and sustainability
The use of composted digestate not only benefits crops but also plays a fundamental role in environmental sustainability. As an organic fertilizer, digestate also helps mitigate greenhouse gas emissions, contributing to more sustainable agriculture.
- Reduction of dependence on chemical fertilizers
One of the main advantages of composted digestate It is the reduction in the need for chemical fertilizers.
- Reduction of nutrient leaching and groundwater contamination
Thanks to its gradual release, composted digestate helps reduce nutrient leaching, preventing these nutrients from seeping into groundwater and causing pollution. This is essential for preserving water quality and protecting aquatic ecosystems.
- Contribution to the circular economy and waste reduction
Biomethanization plants promote the circular economy by transforming organic waste into useful resources such as biogas and composted digestate. This process not only reduces the amount of waste but also closes the nutrient cycle, returning essential elements absorbed by crops to the soil.
Conclusion
El composted digestate It is a highly beneficial solution for both agriculture and the environment. It contributes to improved soil health, reduced dependence on chemical fertilizers, and the protection of water resources.
Furthermore, as a byproduct of biomethanization, it promotes the circular economy and reduces the amount of waste.
In short, the use of composted digestate as fertilizer It represents an ecological and sustainable alternative, which not only improves crop performance, but also supports the transition to more environmentally friendly agriculture.
Farmers who adopt this practice will be contributing to the care of the planet while improving the efficiency of their production.
At SITRA we develop ➡️engineering, operation and maintenance solutions.
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