Spent Bleaching Earth Feed Ingredient via Lime Stabilization
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Solution Overview
Problem
The disposal of spent bleaching earth from edible oil processing poses challenges due to spontaneous combustion, environmental concerns, and lack of economic benefits, with existing methods being costly and inefficient, particularly in large-scale applications.
Innovation Solution
Adding fine-particle lime (calcium carbonate) to spent bleaching earth prevents spontaneous combustion, allowing safe transportation and utilization as a nutritious feed ingredient for poultry and livestock, with the lime component comprising a minimum of 5 wt% and spent bleaching earth up to 95 wt% in feed formulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If spent bleaching earth is disposed of in landfills, then disposal is achieved, but it is expensive and provides no economic benefit
Solution Approach 1:
The patent recovers the edible oil component from spent bleaching earth through solvent extraction, transforming a waste disposal problem into an economic opportunity. The recovered oil can be reused or sold, providing economic benefit while the deoiled clay is used as feed ingredient, eliminating landfill costs.
Solution Approach 2:
The patent converts the harmful spontaneous combustion property of spent bleaching earth into a beneficial process by controlled oxidation in a fluidized bed reactor. The spontaneous combustion tendency is harnessed to generate heat for drying and sterilization, while the resulting deactivated material becomes a safe feed ingredient.
2Reliability
If spent bleaching earth is covered with earth to prevent spontaneous combustion, then safety is improved, but it requires immediate disposal within 24 hours
Solution Approach 1:
The patent performs preliminary oxidation and deactivation of the spent bleaching earth in a fluidized bed reactor before final disposal or use. This preliminary action removes the spontaneous combustion hazard in advance, allowing extended storage and transportation time without safety concerns, thus eliminating the 24-hour disposal constraint.
3Loss of energy
If spent bleaching earth is used as feed ingredient, then economic benefit is achieved, but spontaneous combustion hazard remains
Solution Approach 1:
The patent converts the spontaneous combustion hazard into a beneficial sterilization and drying process. By controlled oxidation in the fluidized bed reactor, the same oxidative property that causes spontaneous combustion is used to dry, sterilize, and deactivate the material, making it safe for feed use while maintaining economic value.
Solution Approach 2:
The patent changes the physical and chemical parameters of spent bleaching earth through controlled oxidation, temperature treatment, and moisture reduction in the fluidized bed reactor. These parameter changes transform the material from a hazardous state (prone to spontaneous combustion) to a safe state (stable for feed use) while preserving economic value.
4Adaptability or versatility
If spent bleaching earth is regenerated by fluidized bed oxidation, then reusability is improved, but equipment cost and pollution control expense increase
Solution Approach 1:
The patent converts the spontaneous combustion hazard into a beneficial sterilization and drying process. By controlled oxidation in the fluidized bed reactor, the same oxidative property that causes spontaneous combustion is used to dry, sterilize, and deactivate the material, making it safe for feed use while maintaining economic value.
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 method effectively prevents spontaneous combustion, enabling safe and economic large-scale disposal and reuse of spent bleaching earth, creating a high-demand feed ingredient that addresses nutritional needs and reduces environmental impact.
Implementation Method 1
air exposure results in rapid oxidation and generation of sufficient heat to ignite the oil
Implementation Method 2
The most common adsorbent used for bleaching is the bleaching earth or clay
Data Source
AI summary
The present invention provides a novel method for disposing of spent bleaching earth that is economically beneficial and avoids the problems typically associated with its disposal. By adding fine-particle lime (calcium carbonate) to the spent bleaching earth discharged from the process filters, spontaneous combustion can be eliminated. The material can then be transported in solid form to a production facility for use as a nutritious ingredient in making a wide range of feed products for poultry and livestock.