Acid-Carbonized Biomass Matrix for Slow-Release Fertilizer
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Solution Overview
Problem
Existing slow-release fertilizers face issues with polymer shells cracking during handling, poor biodegradability, and accumulation in soil, leading to loss of slow-release ability and environmental concerns.
Innovation Solution
A slow-release fertilizer product is developed using an acid-carbonized microporous matrix derived from expanded biomass, where the biomass is expanded through methods like steam explosion and then carbonized with sulfuric or phosphoric acid, leaving residual acid in the pores to react with fertilizer precursors, forming microporous carbon matrices that adsorb and release nutrients slowly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If polymer coatings are used to convert water-soluble fertilizers into slow-release fertilizers, then nutrient release is extended over time, but the polymer shells may crack during transportation and handling, resulting in loss of slow-release ability
Solution Approach 1:
The patent uses an expanded biomass matrix with inherent porosity to deliver nutrients. The porous structure allows controlled nutrient release without requiring an external protective shell, eliminating the cracking issue while maintaining extended release capability through the natural degradation of the biomass material itself
Solution Approach 2:
The invention creates a composite fertilizer system combining expanded biomass (providing structural integrity and porosity) with fertilizer precursors (providing nutrients). This composite approach eliminates the need for separate polymer coatings by integrating the delivery and protective functions into a single material system
2Duration of action of moving object
If polymer coatings are applied to slow-release fertilizers, then nutrient release is controlled over time, but the polymer shells are often poorly biodegradable and build up in the soil after repeated use
Solution Approach 1:
The patent employs expanded biomass as a temporary, biodegradable carrier that performs its nutrient delivery function and then naturally decomposes in the soil. This disposable approach eliminates the accumulation problem associated with persistent polymer coatings, as the biomass material breaks down completely after serving its purpose
Solution Approach 2:
The invention changes the material composition parameter from synthetic polymers to natural biomass materials. This parameter change transforms the biodegradability characteristic from poor (polymers) to good (biomass), allowing the fertilizer system to integrate with natural soil processes and decompose harmlessly after use
3Duration of action of moving object
If polymer shells are used for slow-release fertilizers, then nutrient release is extended, but the shells crack during handling resulting in unrestricted moisture ingress
Solution Approach 1:
The expanded biomass matrix inherently provides a porous structure that controls moisture and nutrient release through its pore architecture rather than through a shell barrier. This eliminates the cracking issue while maintaining controlled release, as the porosity is distributed throughout the material rather than being confined to a shell surface
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the stability and biodegradability of slow-release fertilizers, minimizing nutrient loss and environmental impact while maintaining extended nutrient release, thus providing a more efficient and sustainable fertilizer delivery system.
Implementation Method 1
the biomass is expanded through methods like steam explosion and then carbonized with sulfuric or phosphoric acid, leaving residual acid in the pores
Implementation Method 2
leaving residual acid in the pores to react with fertilizer precursors, forming microporous carbon matrices that adsorb and release nutrients slowly
Implementation Method 3
forming microporous carbon matrices that adsorb and release nutrients slowly
Implementation Method 4
the biomass is expanded through methods like steam explosion
Data Source
AI summary
A fertilizer product comprising an acid-carbonized microporous matrix derived from expanded biomass and a fertilizer reaction product of residual acid from the carbonizing process and at least one added fertilizer precursor. The biomass may include steam exploded wood powder. The expanded biomass may be carbonized with a combination of sulphuric and phosphoric acids, followed by ammoniation to produce ammonium sulphate and mono- or diammonium phosphate. The fertilizer reaction product adsorbs onto the carbon matrix, which results in a slow-release when the material is applied to the soil.