Integrated Clarification Plant Layout to Counter Underground Buoyancy
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Solution Overview
Problem
Small wastewater treatment plants face issues with hydrostatic buoyancy forces when installed underground, particularly in areas with high groundwater levels, leading to potential floating and the need for costly anchoring solutions, limiting their application and economic viability.
Innovation Solution
Incorporating a third tank for rainwater collection, which is integrated with the system to counteract buoyancy by filling the tanks with rainwater, reducing the need for additional anchoring and minimizing excavation and material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the second tank is left empty for filtration operation, then the filtration function is improved, but hydrostatic buoyancy increases causing the tank to float
Solution Approach 1:
The patent combines the second tank (for filtration) and third tank (for water storage) into a single integrated underground structure. The third tank is positioned below the second tank and is permanently connected to the groundwater level, creating a combined system where the lower tank provides continuous ballast to counteract buoyancy forces acting on the upper filtration tank.
Solution Approach 2:
The third tank filled with groundwater serves as a permanent ballast that counteracts the hydrostatic buoyancy forces acting on the second tank. By positioning the water-filled tank below the filtration tank and connecting them, the system creates a counterbalancing weight that prevents the filtration tank from floating during operation.
2Stability of the object's composition
If anchoring devices are added to counteract buoyancy, then system stability is improved, but installation complexity and cost increase
Solution Approach 1:
The patent merges the ballast function with the water storage function by integrating the third tank into the same underground structure as the second tank. This eliminates the need for separate anchoring devices by using the stored water itself as the counterbalancing weight, thereby reducing installation complexity while maintaining stability.
3Adaptability or versatility
If three separate tanks are used for wastewater treatment and rainwater collection, then functionality is improved, but excavation volume and material requirements increase
Solution Approach 1:
The patent merges the second tank (filtration) and third tank (water storage) into a single integrated underground structure with shared walls and connection points. This vertical integration allows two distinct functional tanks to occupy a smaller combined volume compared to three separate horizontally arranged tanks, reducing excavation requirements while maintaining full functionality.
Solution Approach 2:
The patent transitions from a horizontal arrangement of separate tanks to a vertical integration where the third tank is positioned below the second tank. This dimensional change allows the system to achieve the same functional capacity with reduced footprint and excavation volume by utilizing the vertical space underground.
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 integrated rainwater tank reduces hydrostatic buoyancy, enhances system stability, and lowers installation costs by minimizing excavation and material requirements, thus improving the economic efficiency and range of applications.
Implementation Method 1
When the unit comprising the three tanks is installed underground and surrounded by groundwater or rainwater, the rainwater-filled third tank reduces the hydrostatic buoyancy of the entire unit
Implementation Method 2
a first container with a feed for wastewater, in which preliminary clarification takes place as a result of solid particles settling to the bottom of the first container
Data Source
Figure 1
Figure 2
AI summary
A small wastewater treatment plant (8) comprises a first plastic tank (9) with a wastewater inlet, in which preliminary clarification takes place due to the settling of solids to the bottom of the first tank (9), and a second plastic tank (10) connected to the first tank (9) via an overflow and containing a filter device (20). The filtered wastewater can be discharged from the second tank (10) via an outlet (21) below the filter device (20). Water can be supplied to a third plastic tank (11) via a rainwater inlet (27), collected in the third tank (11), and removed via a discharge opening. The at least three tanks (9, 10, 11) are arranged horizontally side by side and rigidly connected to one another.