Reactive Calcium Silicate Media for Phosphate Removal
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Solution Overview
Problem
Current sorbent media for removing impurities like phosphate and carbonate from water have low available concentrations of reactive calcium, high preparation costs, and limited capacity for sorption, making them inefficient and expensive.
Innovation Solution
A reactive media comprising 80-99% ceramic and 14-18% reactive calcium in the form of CaO, available to form solid calcium salts with anionic materials at pH 9-14, made by heating a mixture of non-clumping clay, dolomitic limestone, CaO, and peat to partially vitrify, allowing for efficient absorption and regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If current sorbent media are used for removing impurities from water, then impurity removal function is provided, but available concentration of reactive calcium is low and preparation expense is high
Solution Approach 1:
The patent changes the chemical composition parameters of the sorbent media by incorporating specific ratios of calcium oxide (14-18 wt%), ceramic (80-99 wt%), and optional components like non-clumping clay (0-40 wt%), dolomitic limestone (0-10 wt%), and peat (0-10 wt%). This compositional parameter optimization achieves high available calcium concentration (14-18% as CaO) while controlling preparation costs through selective use of raw materials.
Solution Approach 2:
The patent creates composite sorbent media by combining multiple materials with different functions: calcium oxide provides reactive calcium for impurity removal, ceramic provides structural stability and porosity, non-clumping clay enhances sorption capacity, dolomitic limestone supplements calcium and magnesium content, and peat improves porosity and water retention. This composite approach achieves high performance while balancing preparation expenses.
2Quantity of substance
If current sorbent media are used for impurity removal, then some sorption capacity is provided, but capacity for sorption of impurities such as phosphate or carbonate is low
Solution Approach 1:
The patent utilizes porous ceramic as the primary structural component (80-99 wt%), which provides high surface area and porosity for impurity sorption. The porous structure increases the available sites for phosphate and carbonate adsorption, significantly enhancing sorption capacity while maintaining fast sorption kinetics for high productivity.
Solution Approach 2:
The patent optimizes chemical composition parameters, specifically maintaining calcium oxide content at 14-18 wt% to ensure sufficient reactive calcium for forming calcium phosphate and calcium carbonate precipitates. The controlled pH range (9-14) further enhances the sorption capacity for anionic impurities like phosphate and carbonate by promoting favorable chemical reactions.
3Productivity
If reactive media is used to capture oxidized phosphorus, then impurity removal is achieved, but maintaining permeability while allowing higher flow rates is needed
Solution Approach 1:
The patent employs porous ceramic with optimized pore size distribution and structure that maintains high permeability even at elevated flow rates. The porous structure allows water to flow through while capturing oxidized phosphorus, preventing clogging and maintaining reliable permeability under high productivity conditions.
Solution Approach 2:
The composite formulation combining ceramic, calcium oxide, and optional components creates a mechanically robust material that maintains structural integrity and permeability channels during operation. The ceramic matrix provides stable porosity that resists collapse under flow pressure, ensuring reliable permeability maintenance while enabling higher flow rates for improved productivity.
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 reactive media provides a higher concentration of reactive calcium at a lower cost, efficiently captures oxidized phosphorus as tricalcium phosphate, maintaining permeability and allowing for higher flow rates, thus effectively removing impurities while being more environmentally friendly and cost-effective.
Implementation Method 1
The reactive media provides a higher concentration of reactive calcium at a lower cost, efficiently captures oxidized phosphorus as tricalcium phosphate
Implementation Method 2
A reactive media comprising 80-99% ceramic and 14-18% reactive calcium in the form of CaO, available to form solid calcium salts with anionic materials
Data Source
AI summary
Various embodiments of the present invention relate to reactive media including calcium. A reactive media includes a vitrified calcium silicate comprising reactive calcium. Various embodiments of the reactive media described herein are useful for removal of anionic impurities such as phosphate from water.