Water Softening Regenerant with Metal Chelating Agents
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Solution Overview
Problem
Conventional water softeners are inefficient in removing calcium and magnesium ions, leading to scale buildup and equipment damage, and high-efficiency units are cost-prohibitive, while existing methods for regenerating ion exchange resins discharge excessive sodium and chloride into the environment.
Innovation Solution
A method and product that combines a salt with a metal chelating agent, such as sodium citrate or ethylenediamine tetraacetate, to regenerate ion exchange materials, enhancing the removal of calcium and magnesium ions by at least 50% more than without the chelating agent, using conventional water softening equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional water softeners use traditional salt for regenerating ion exchange resin, then the equipment can remove calcium and magnesium ions, but the efficiency is low and excessive sodium and chloride are discharged into the environment
Solution Approach 1:
The invention changes the chemical composition parameters of the regenerant by adding metal chelating agents (such as EDTA, citric acid, or phosphonic acid) to the salt solution. These chelating agents form stable complexes with calcium and magnesium ions, enhancing their removal from the resin and improving regeneration efficiency while reducing the amount of salt needed.
Solution Approach 2:
Metal chelating agents act as intermediaries that facilitate the exchange process. They bind to metal ions in the brine solution, creating soluble complexes that can be more effectively exchanged with the resin, thereby improving the overall efficiency of the regeneration process and reducing waste discharge.
2Object-generated harmful factors
If high efficiency water softeners are used to reduce sodium and chloride discharge, then environmental benefits are achieved, but the equipment cost increases significantly
Solution Approach 1:
The invention modifies the chemical parameters of the regenerant by incorporating metal chelating agents into the traditional salt solution. This chemical modification enables conventional equipment to achieve high efficiency regeneration, eliminating the need for expensive specialized equipment while still reducing environmental discharge.
Solution Approach 2:
The invention uses inexpensive chemical additives (metal chelating agents) that can be mixed with regular salt to create an enhanced regenerant. This approach replaces the need for costly high-efficiency equipment with a low-cost chemical solution that can be easily implemented in existing systems.
3Duration of action of stationary object
If conventional water softeners operate with standard regeneration processes, then they can function continuously, but the amount of salt consumed is excessive and efficiency is low
Solution Approach 1:
By changing the chemical composition of the regenerant to include metal chelating agents, the invention improves the effectiveness of each regeneration cycle. This allows the system to maintain continuous operation with reduced salt consumption, as the chelating agents enhance the ion exchange efficiency and allow for more complete resin regeneration.
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 significantly increases the efficiency of water softening, reducing the amount of salt needed and minimizing environmental discharge of sodium and chloride, while maintaining high removal rates of calcium and magnesium ions, thus extending the life of water softener regenerants and reducing environmental impact.
Implementation Method 1
contacting an ion exchange material with an aqueous solution or dispersion comprising the salt and a metal chelating agent to yield a regenerated ion exchange material
Implementation Method 2
The resin has copious negatively-charged (anionic) functional groups that bind to positively-charged substances (cations), such as calcium and magnesium ions
Data Source
AI summary
Novel water softening products and methods of treating hard water are provided. The products comprise a salt and a metal chelating agent. The products are useful for regenerating ion exchange material in a water softening system and providing softened water containing both sodium and potassium ions, while having dramatically increased efficiencies over prior art products.