Self-Cleaning Debris Screen for Runoff Water Separation
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Solution Overview
Problem
Existing sediment removal systems from fluid streams struggle to effectively capture neutrally buoyant materials, leading to suboptimal treatment of runoff water due to their inability to handle varying flow rates and intense storm events, resulting in pollutants being discharged during high flow events.
Innovation Solution
Incorporating perforated plates or screens that allow lateral movement to create pressure differentials and turbulator fins to enhance debris removal, along with a porous basket in the second compartment to trap and remove neutral buoyant materials, which can flex or shake to prevent clogging and maintain flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screens are used to trap neutral buoyant materials, then removal efficiency of neutral buoyant materials is improved, but screens become clogged and impede water throughput
Solution Approach 1:
The screen is made movable rather than fixed, allowing it to flex and shake in response to water flow and debris accumulation. This dynamic movement prevents permanent clogging by periodically dislodging trapped materials, thereby maintaining water throughput while continuing to capture neutral buoyant materials.
Solution Approach 2:
The screen utilizes mechanical vibration through flexing and shaking motions caused by water flow and debris impact. This vibration prevents debris from adhering firmly to the screen surface, reducing clogging and maintaining open flow paths for water while preserving the screening function.
2Strength
If screens are made rigid to maintain structural integrity, then screen strength is improved, but debris accumulates and causes overflow conditions
Solution Approach 1:
The screen transitions from a rigid structure to a dynamic, flexible structure that can move and deform. This flexibility allows the screen to respond to debris accumulation by shaking and flexing, preventing overflow conditions while maintaining sufficient structural integrity to withstand water flow and debris forces.
3Adaptability or versatility
If separator capacity is increased to handle high flow events, then ability to treat intense storms is improved, but system complexity increases
Solution Approach 1:
The screen system is designed to be self-cleaning through the natural flexing and shaking motions caused by water flow and debris accumulation. This self-service mechanism eliminates the need for complex external cleaning systems or manual intervention, allowing the separator to handle varying flow rates including intense storms without increasing system complexity.
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 solution effectively captures and removes neutral buoyant materials, improving the treatment efficiency of runoff water by ensuring continuous operation during high flow events and preventing material buildup, thus enhancing the overall treatment process.
Implementation Method 1
Screen movement imparts pressure differential across the screen perforations releasing debris trapped against the screen
Implementation Method 2
one or more turbulator fins attached to the screens for intersecting the water flow and transferring energy to the screen to impart lateral movement to the screen
Implementation Method 3
The screens are located so that the water must flow through the screen while in the treatment vessel
Data Source
AI summary
A runoff water vault may be divided into an input chamber which receives runoff water and a second chamber which also separates and stores buoyant and non-buoyant materials separated from the runoff water stream. While the separators in such systems remove particles of different densities than water quite well, they have difficulty in removing neutrally buoyant debris. Screens are added into the water flow stream to catch and remove particles of neutral buoyancy. The screens are mounted in a manner which permits lateral movement of the screen relative to the water flow, such as shaking and/or flexing. Screen movement imparts pressure differential across the screen perforations releasing debris trapped against the screen, so that the debris will fall into an entrainment area and allow increased flow through the screen. The screens may also include one or more turbulator fins for intersecting the water flow and transferring energy to the screen, imparting lateral movement to the screen.