Radioactive Waste Treatment via Biofilter and Neutron Transmutation
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Solution Overview
Problem
Current methods for treating radioactive waste, particularly irradiated graphite and nuclear fuel elements, are inefficient in removing radioisotopes and facilitating safe long-term storage, as they do not effectively reduce the volume of waste and transform long-lived fission products into shorter-lived species.
Innovation Solution
A method involving reducing irradiated materials to a particulate form, suspending them in a fluid, and using biological treatment with biofilters to remove radioisotopes, along with neutron radiation to induce nuclear transmutations, and magnetic fields to deflect and collect isotopes, thereby reducing the volume and transforming fission products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If current methods are used to treat radioactive waste, then the waste can be stored, but the volume reduction is insufficient and long-lived fission products cannot be transformed into shorter-lived species
Solution Approach 1:
The waste treatment process is divided into multiple sequential stages: mechanical size reduction, biological treatment with biofilters for radioisotope removal, and neutron irradiation for transmutation. Each stage addresses specific aspects of waste management, collectively achieving both volume reduction and effective radioisotope removal.
Solution Approach 2:
Biofilters containing microorganisms act as intermediaries to selectively remove radioisotopes from the waste suspension. The biological system mediates between the radioactive waste and the environment, capturing harmful isotopes while allowing treated material to proceed to further processing or storage.
2Reliability
If biological treatment is used to remove radioisotopes, then radioisotope removal efficiency improves, but the process complexity increases
Solution Approach 1:
The biofilters utilize microorganisms that naturally occur or can be cultured, which self-replicate and maintain the treatment capability. The biological system serves itself by using readily available microorganisms to perform the radioisotope removal function without requiring complex mechanical or chemical intervention systems.
3Duration of action of stationary object
If neutron irradiation is applied to induce nuclear transmutations, then long-lived fission products are transformed into shorter-lived species, but the device complexity and energy requirements increase
Solution Approach 1:
The neutron irradiation process converts the harmful long-lived radioactive isotopes into beneficial shorter-lived or stable isotopes. The harmful radioactivity is transformed into a benefit by reducing the long-term radiological hazard through nuclear transmutation, effectively converting a waste management problem into a solution.
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 method effectively reduces the volume of radioactive waste by up to 95%, transforms long-lived fission products into shorter-lived species, and facilitates safe storage and potential re-use of graphite materials, while addressing environmental concerns like carbon-14 handling.
Implementation Method 1
The method may include exposing the separated fuel particles to neutron radiation in order to induce nuclear transmutations of fission products to shorter-lived species
Implementation Method 2
deflecting radioisotopes from the suspension towards an isotope collection zone defined along a length of the flow path
Data Source
AI summary
This invention relates to a method of treating irradiated material which includes reducing irradiated material to particulate form, suspending the particulate irradiated material, or derivatives thereof, in a fluid to form a suspension, and removing radioisotopes from the suspension by biological treatment.