Rotary Screen Separator for Septic Tank Solids
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Solution Overview
Problem
Existing methods for separating liquid and solid materials from septic tanks are inefficient, requiring pre-filtering, skilled technicians, and taking several hours to complete, with rotary filters often lacking the capacity to process entire tanks, leading to increased costs and processing times.
Innovation Solution
A separator system with a rotatable screen and suction unit that compacts solid materials against perforations, allowing liquid to pass through and separate from solids, and a supply level regulator to maintain optimal screening pressure, enabling efficient extraction of solids without pre-filtering and reducing processing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotary filters are used to separate solids and liquids from septic tanks, then separation function is achieved, but the capacity is insufficient to process entire tanks, increasing processing times and costs
Solution Approach 1:
The screen is divided into multiple perforated sections that can be independently rotated, allowing different sections to be at different stages of the separation process simultaneously. This segmentation enables the system to handle larger volumes of septic tank contents without increasing overall processing time.
Solution Approach 2:
The invention transitions from traditional horizontal rotary filters to a vertical rotary screen configuration. This dimensional change allows the screen to be positioned such that the supply accumulates within the screen to a supply height, creating screening pressure that acts perpendicular to the screen surface, thereby increasing processing capacity.
2Reliability
If pre-filtering is performed to separate floating solid layer before processing, then system operation is improved, but processing times increase and system complexity increases
Solution Approach 1:
The system performs preliminary separation actions within the rotating screen itself rather than requiring separate pre-filtering equipment. The screen's rotation and the accumulation of supply to create screening pressure automatically separate floating solids from the liquid phase during the main processing cycle, eliminating the need for separate pre-filtering operations.
Solution Approach 2:
The rotary screen serves multiple functions simultaneously: it acts as both the separation medium and the processing chamber, handling both floating and settled solids without requiring separate pre-filtering equipment. This multi-functionality reduces system complexity and eliminates additional processing time.
3Reliability
If specialized technicians perform the separation process, then proper operation is ensured, but costs increase and availability to laypeople decreases
Solution Approach 1:
The system is designed to be self-regulating through the supply level regulator, which automatically maintains the supply level within the screen without requiring manual intervention or specialized knowledge. The automatic operation and simplified controls enable laypeople to operate the system independently, reducing dependency on specialized technicians.
4Productivity
If many hours are allocated for complete separation and liquid return, then thorough processing is achieved, but convenience for tank owners decreases
Solution Approach 1:
The rotary screen operates continuously without interruption, maintaining the separation process throughout the entire cycle. The continuous rotation ensures that liquid passes through the screen constantly while solids are progressively separated and discharged, achieving complete separation in a single continuous operation rather than requiring multiple intermittent steps.
Solution Approach 2:
The system uses dynamic rotation of the screen to optimize the separation process at different phases. The rotation speed and position are adjusted to maximize liquid passage through perforations while ensuring complete solid separation, achieving thorough processing in reduced time through dynamic optimization rather than static, time-consuming operations.
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 system allows for rapid and efficient separation of liquid and solid materials, enabling the complete emptying of septic tanks in under ten minutes, reducing costs and increasing accessibility for non-specialized technicians, while maintaining the beneficial liquid for reuse.
Implementation Method 1
the supply accumulates within the screen to a supply height, the supply thereby providing a screening pressure acting against the at least one perforated section so as to compact the solid material against the perforations
Implementation Method 2
the screen being positioned, shaped, and sized for receiving the supply from the inlet of the casing such that the supply accumulates within the screen to a supply height
Implementation Method 3
a suction unit disposed within the screen, the suction unit comprising a suction head disposed above the supply height and positioned for extracting the solid material from the perforations
Data Source
AI summary
A separator and method for separating a heterogeneous supply into a liquid and a solid material. The separator includes a casing in which the supply can collect, and which has an inlet for receiving the supply and an outlet for conveying the supply. The separator also includes a screen which rotates relative to the casing. The screen has perforated sections having a plurality of perforations which permit passage of the liquid. The screen allows for the accumulation of the supply within it, which rises to a level corresponding to a supply height. As this supply height, a screening pressure acts against the perforated sections so as to compact the solid material against the perforations while the liquid passes therethrough. A suction unit sucks the compacted solid material from the perforations, and is disposed higher than the supply height. A supply level regulator regulates the level of the supply within the screen.