French Press Permeameter for Soil Testing
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Solution Overview
Problem
Conventional laboratory permeability testing devices for soil are complex, prone to bacterial clogging, and require significant lab space, making them inefficient and susceptible to errors due to biofilm growth, especially when testing contaminated soils or fluids.
Innovation Solution
A vertical permeability testing apparatus with a piston and cylinder design, inspired by a French coffee press, that eliminates the need for tubing, allowing for easy deairing and performing all three types of permeability tests (constant head, falling head, and falling head-rising tail) without effluent production, thus minimizing biological clogging and fluid disposal issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional laboratory permeability testing devices are used, then permeability measurements can be obtained, but the devices are complex, require significant lab space, and are prone to bacterial clogging
Solution Approach 1:
The apparatus is divided into distinct functional segments: a sample chamber for holding soil samples, a piston mechanism for applying hydraulic pressure, and a simplified fluid pathway without tubing. This segmentation allows each component to perform its specific function efficiently while reducing overall system complexity and eliminating the tubing that causes bacterial clogging.
Solution Approach 2:
The invention extracts and eliminates the tubing component from the hydraulic system. By using a direct piston-to-sample chamber connection without intermediate tubing, the system removes the source of bacterial growth and clogging while maintaining the ability to control hydraulic pressure for permeability measurements.
2Ease of operation
If conventional permeability testing devices with tubing are used, then fluid flow can be controlled, but bacterial clogging and biofilm growth occur
Solution Approach 1:
The tubing that enables fluid flow control is completely removed from the system. Instead, fluid flow is controlled directly through the piston mechanism acting on the sample chamber, eliminating the interface where bacteria can grow and cause clogging while maintaining operational control.
Solution Approach 2:
The piston mechanism directly interfaces with the sample chamber to control fluid flow, creating a self-contained system that eliminates external tubing components. This self-service design reduces the surfaces available for bacterial attachment and growth while maintaining the ability to regulate fluid flow for testing.
3Productivity
If conventional permeability testing devices are used, then testing can be performed, but significant lab space is required
Solution Approach 1:
Multiple functions are merged into a compact integrated apparatus: the sample chamber, piston mechanism, and fluid containment are combined into a single unified device. This integration significantly reduces the space required compared to conventional distributed systems while maintaining full testing capability.
Solution Approach 2:
The apparatus uses a nested structure where the piston fits within the sample chamber, and the entire assembly is contained within a compact housing. This nesting arrangement minimizes the footprint and lab space required while preserving all necessary testing functions.
4Measurement precision
If conventional permeability testing devices are used, then measurements can be obtained, but the system is susceptible to errors due to biofilm growth
Solution Approach 1:
The tubing component that serves as a breeding ground for biofilm is extracted from the system. By eliminating this component, the source of measurement errors and reliability issues is removed, while the direct piston-to-chamber connection maintains the precision needed for accurate permeability measurements.
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 apparatus simplifies the hydraulic system, reduces complexity, and enhances testing efficiency by eliminating tubing-related issues, allowing for reliable and accurate permeability measurements in both contaminated and hazardous soil and fluid conditions, while minimizing biological clogging and fluid disposal challenges.
Implementation Method 1
a piston and cylinder design inspired by a French coffee press
Implementation Method 2
The permeability of soil, also known as hydraulic conductivity, is defined as the soil's conductivity to fluid flow
Data Source
AI summary
A permeameter device comprising a pedestal base, wherein said pedestal base comprises an inner raised wall and an outer raised wall, wherein the inner raised wall is lower in height than the outer raised wall, a trough defined between the outer and inner walls of dimensions to accept therein a cylindrical tube, and at least one passage, having an inner port on said inner wall and extending through the outer wall through an outer port for fluid connection through said passage, and a loading rod, wherein a sample is prepared to fit within the cylindrical tube.