Filter Bed Cleaning via Acid-Alkaline Neutralization
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Solution Overview
Problem
Current chemical cleaning methods for granular media filter beds in water filtration plants require additional neutralizing chemicals and collection vessels to safely discharge spent treatment fluids, increasing costs and complexity.
Innovation Solution
A system utilizing two filter cells with treatment fluids of opposite pH, maintained in fluid isolation, where the spent treatment fluid with an intermediate pH is produced by mixing the outflows from both cells in a receptacle, allowing for safe discharge without additional neutralization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If spent treatment fluid is discharged directly after cleaning, then discharge simplicity is improved, but environmental safety deteriorates due to extreme pH levels
Solution Approach 1:
The patent converts the harmful extreme pH levels of spent treatment fluids into a beneficial neutralization process by mixing acidic and alkaline fluids from alternating filter cells, transforming the harmful property into a useful neutralization mechanism that produces safe discharge water
2Object-affected harmful factors
If neutralizing chemicals and collection vessels are used, then environmental safety is improved, but system complexity and cost increase
Solution Approach 1:
The system performs self-neutralization by utilizing the chemical properties of the spent treatment fluids themselves - alternating acidic and alkaline filter cells automatically neutralize each other when their outflows are mixed, eliminating the need for external neutralizing chemicals and collection vessels
Solution Approach 2:
The patent merges the discharge streams from multiple filter cells with opposite pH values into a single receptacle, where they automatically neutralize each other, combining what were previously separate harmful streams into a single safe discharge flow
3Object-affected harmful factors
If neutralizing chemicals and collection vessels are used, then environmental safety is improved, but operational cost increases
Solution Approach 1:
The system performs self-neutralization by utilizing the chemical properties of the spent treatment fluids themselves - alternating acidic and alkaline filter cells automatically neutralize each other when their outflows are mixed, eliminating the need for external neutralizing chemicals and collection vessels
Solution Approach 2:
Instead of discarding the spent treatment fluids as harmful waste requiring expensive neutralization and collection, the system recovers their neutralizing potential by mixing them in alternating sequence, transforming waste into a resource that neutralizes itself
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 eliminates the need for neutralizing chemicals and collection vessels, reducing costs and simplifying the process while ensuring environmentally safe disposal of spent treatment fluids.
Implementation Method 1
Treatment fluids from the first and second filter cells may be received and mixed within the receptacle to produce a spent treatment fluid having a third pH intermediate to the first and second pHs
Data Source
AI summary
A cleaning system for filter beds uses the existing permanent infrastructure of a water filtration plant. Treatment fluids of opposite pH are introduced into a pair of filter cells that are separated by a gullet. Each filter cell contains a filter bed. One filter cell receives an acidic treatment fluid and the other receives an alkaline treatment fluid. After treatment is complete, the treatment fluids from each filter cell are simultaneously drained into the gullet, where mixing and neutralization occur. The resulting spent treatment fluid has an intermediate pH that allows it to be safely drained into a wastewater sewer.