Treating hard water using an acid salt-regenerated ion exchange resin
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Solution Overview
Problem
Conventional water softening methods using ion exchange resins require large amounts of sodium chloride, leading to waste streams with high sodium content, which pose environmental concerns and increase salt levels in discharge waters, and they often necessitate the use of briny solutions, causing downstream water reuse issues.
Innovation Solution
The use of acid regenerate-able ion exchange resins, which exchange protons for dissolved cations, including water hardness ions, to produce softened, acidic water with reduced total dissolved solids, and regeneration is achieved using acid and/or acid salts, reducing the need for polymers and threshold reagents in cleaning compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional ion exchange resins are used with sodium chloride for regeneration, then water softening is achieved, but high sodium content in waste streams is generated
Solution Approach 1:
The patent changes the chemical parameter of the regenerant from sodium chloride to acid salts (such as ammonium sulfate, potassium sulfate, or organic acid salts). This substitution maintains the ion exchange softening function while fundamentally altering the waste stream composition to eliminate or reduce sodium content, directly resolving the contradiction between softening capacity and harmful waste discharge
Solution Approach 2:
The patent converts the traditionally harmful high-sodium waste stream into a beneficial low-sodium or sodium-free effluent that can be safely discharged or reused. By using acid salt regenerants, the waste stream becomes environmentally friendly while maintaining effective water softening, turning a harmful byproduct into a beneficial outcome
2Duration of action of stationary object
If briny solutions are used for resin regeneration, then resin regeneration is achieved, but downstream water reuse is compromised
Solution Approach 1:
The patent changes the chemical composition parameter of the regenerant from briny (high salt) solutions to acid salt solutions. This parameter change enables the treated water to meet reuse specifications for various applications such as potable water, agriculture, and industrial processes, while still achieving complete resin regeneration functionality
Solution Approach 2:
The patent makes the water treatment system universally applicable for multiple purposes by producing effluent that can be reused in diverse applications. The acid salt regeneration process creates a versatile output that serves both as regenerated resin and as reusable water for various downstream uses, eliminating the limitation of single-purpose discharge
3Quantity of substance
If traditional water softeners are used, then hardness removal is achieved, but environmental pollution from salt discharge increases
Solution Approach 1:
The patent changes the chemical parameter of the regenerant from sodium chloride to acid salts (ammonium sulfate, potassium sulfate, organic acid salts). This substitution maintains effective hardness ion removal while fundamentally changing the discharge water composition to eliminate salt pollution, directly resolving the contradiction between hardness removal and environmental pollution
Solution Approach 2:
The patent converts the harmful salt pollution byproduct into a beneficial environmentally friendly effluent. The acid salt regeneration process transforms what would be polluted discharge water into clean water suitable for environmental discharge or reuse, while maintaining effective hardness removal, thus converting harm into benefit
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 approach generates high-quality, softened water with reduced salt content, minimizing environmental impact and improving cleaning efficacy while reducing the demand for additional chemicals, and allows for the reuse of the resin, eliminating the need for external regeneration processes.
Implementation Method 1
Ion exchange can be used to exchange hardness ions, such as calcium and magnesium, in the water with sodium or other ions associated with a resin bed in a water softening unit
Data Source
AI summary
Methods and systems for acid regeneration of ion exchange resins are disclosed. Acid resins designed for use in a variety of cleaning application using a water source use a treated, softened, acidic water source according to the invention. Various methods of using the softened acidic water generated by acid regenerate-able ion exchange resins are disclosed to beneficially reduce spotting, filming and scale buildup on treated surfaces, reduce and/or eliminate the need for polymers, threshold reagents and/or rinse aids, and using protons generated in the acidic water effluent for triggering events useful in various cleaning applications.