Spent Lime Pellets for Uniform Soil pH Correction
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Solution Overview
Problem
Conventional lime products for soil pH correction are caustic, costly, and persist on the surface, causing localized burning and uneven application, while spent lime from wastewater treatment is often sent to landfills without a practical use.
Innovation Solution
Water-dispersible pellets composed of 80-99.5% spent lime particles and 0.5-20% binder, designed to break into numerous pieces upon contact with water, facilitating uniform soil penetration and pH modification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional lime materials (burnt lime, hydrated lime) are applied to correct soil pH, then the soil pH is raised, but localized caustic burning of the target crop occurs and application uniformity is poor
Solution Approach 1:
The invention segments the lime material into fine particles (mean particle size 0.5-2.0 mm) that disperse uniformly across the soil surface, preventing localized concentration and caustic burning while maintaining effective pH correction
Solution Approach 2:
The invention creates uniform local distribution of lime particles across the entire treated area through controlled particle size and broadcasting application, ensuring consistent pH adjustment without localized overheating or burning
2Area of stationary object
If finely ground agricultural lime is applied to correct soil pH, then the application coverage is improved, but the particles bridge spreader openings and application uniformity deteriorates
Solution Approach 1:
The invention optimizes the particle size parameter to a specific range (0.5-2.0 mm mean size) that prevents bridging in broadcast spreaders while maintaining fine enough particles for uniform dispersion and effective soil pH correction
3Productivity
If granular agricultural lime is broadcast applied to treat target crops, then large areas can be covered efficiently, but the particles persist on the surface and cause localized burning and uneven response
Solution Approach 1:
The invention segments lime into smaller, uniformly sized particles (0.5-2.0 mm) that disperse more evenly across large areas, preventing the localized concentration that causes burning while maintaining broadcast application efficiency
Solution Approach 2:
The invention creates particles with dynamic properties that allow them to flow freely through broadcast spreaders and disperse uniformly across the target area, eliminating the static, clumpy behavior of conventional granular lime
4Loss of substance
If spent lime from wastewater treatment is sent to landfills, then disposal is achieved, but resource utilization is poor and environmental benefit is lost
Solution Approach 1:
The invention converts the harmful waste product (spent lime) into a beneficial soil amendment by recovering and reprocessing it into uniformly sized particles that effectively correct soil pH, transforming a disposal problem into a resource recovery solution
Solution Approach 2:
The invention recovers spent lime from wastewater treatment sludge, processes it through drying and grinding to create uniform particles, and reapplies it to soil, closing the material loop and eliminating landfill disposal
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
The pellets provide faster soil pH adjustment with reduced surface persistence and safety risks, effectively utilizing spent lime and improving application uniformity and safety.
Implementation Method 1
a binder component present from 20 to 0.5 total weight percent. The spent lime particles, and the binder component present in a form such that contact with water causes pellet dispersion into more than 100 pieces
Data Source
AI summary
Water-dispersible pellets are provided that includes spent lime particles present from 80 to 99.5 total weight percent. A binder component is also present from 20 to 0.5 total weight percent. The pellets have a mean pellet domain size. The spent lime particles, and the binder component present in a form such that contact with water causes pellet dispersion into more than 100 pieces. A process of forming spent lime pellets is also provided that include spent lime being dewatered to a free-flowing powder. A binder is then added under conditions to induce agglomeration of the free-flowing powder to the form the pellets. A process of treating a target crop is also provided based on such pellets.