Sodium-Activated Bentonite Slurry for Oxyanion Sequestration
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Solution Overview
Problem
Existing slurry-based remediation materials for oxyanion contamination in large bodies of water face challenges in transportation due to high water volume requirements and varying efficacy, cost, and difficulty in manufacture, necessitating a more efficient and effective treatment solution.
Innovation Solution
A slurry comprising sodium-activated bentonite treated with rare earth salts like lanthanum, cerium, or dysprosium is developed, which provides active sequestration sites for oxyanion removal, allowing on-site manufacture and efficient transportation as a dried powder or pellet, then reconstituted at the treatment site.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slurry-based remediation materials are used for treatment of oxyanion contamination, then treatment efficacy is improved, but transportation difficulty increases due to high water volume requirements
Solution Approach 1:
The remediation material is prepared in advance as a dried powder or pellet form containing sodium-activated bentonite and rare earth salts. This preliminary preparation eliminates the need for transporting large volumes of water, as the material can be stored and transported in a compact, stable state and then reconstituted with site water at the treatment location.
Solution Approach 2:
The invention changes the physical state and composition parameters of the remediation material by using dried powder or pellet forms instead of pre-mixed slurries. This parameter change allows the material to be transported in a compact form and then reconstituted with site water at the treatment location, solving the transportation difficulty while maintaining treatment efficacy.
2Adaptability or versatility
If various remediation materials are used with wide range of properties, then treatment adaptability is improved, but manufacturing complexity increases
Solution Approach 1:
The invention uses a universal base material (sodium-activated bentonite) combined with rare earth salts that can treat multiple types of oxyanion contamination. This multi-functional approach allows the same basic formulation to adapt to different contamination scenarios without requiring complex manufacturing processes for each specific application.
Solution Approach 2:
The remediation material is formulated as a composite consisting of sodium-activated bentonite and rare earth salts. This composite structure combines the high cation exchange capacity of bentonite with the oxyanion sequestration capabilities of rare earth salts, providing versatile treatment adaptability through a single manufacturable product.
3Quantity of substance
If high volume water is used in slurry transport, then material delivery is improved, but transportation cost increases
Solution Approach 1:
The invention extracts the water component from the transport mixture, delivering only the solid remediation material (dried powder or pellets) to the treatment site. The water is taken out and replaced by using site water for reconstitution, dramatically reducing transportation volume and associated costs while ensuring adequate material delivery.
Solution Approach 2:
The remediation material is prepared in a dried or semi-dried state before transport, removing the bulk water component. This preliminary removal of water allows for compact, cost-effective transportation, and the material is then reconstituted with site water at the treatment location to achieve the required slurry concentration for effective delivery.
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 sodium-activated bentonite slurry effectively sequesters oxyanions, such as phosphates, from water and sediments, improving treatment efficacy and reducing transportation costs and complexity, while maintaining environmental safety and effectiveness.
Implementation Method 1
The clays of interest in the present invention have the property of expandability in water and high cation exchange capacity (CEC)
Implementation Method 2
treating said sodium activated bentonite with rare earth salts selected from lanthanum, cerium, yttrium and dysprosium to provide a plurality of active sequestration sites within or associated with the sodium bentonite
Data Source
AI summary
A slurry for treatment of oxyanion contamination in water including: an expandable bentonite having at least 0.50% sodium as disodium monoxide; said bentonite having or being treated to have a sodium content in excess of 3.00% sodium as disodium monoxide so as to provide a sodium activated bentonite; said sodium activated bentonite being treated with rare earth salts selected from lanthanum, cerium, yttrium and dysprosium to provide a plurality of active sequestration sites within or associated with the sodium bentonite.