Dual-Grating Screening for Wastewater Pump Chamber Protection
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Solution Overview
Problem
Existing wastewater treatment systems struggle to effectively retain and remove both heavy and light solid waste from the coarse solids chamber, allowing lighter solids to escape into the pumping chamber, leading to damage and inefficiencies in subsequent processes.
Innovation Solution
A screening device with a vertical frame and dual grating system, incorporating a cleaning rake and brush mechanism, automatically cleans and retains lighter solids within the coarse solids chamber, while heavier solids settle at the bottom, and a clam shell bucket collects settled waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed bar grating with 40-80mm clearance is installed to retain solid waste, then heavier solids are retained effectively, but lighter solids escape through the openings between bars
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed static grating with a movable grating system that can change its configuration. The grating moves between a horizontal position (allowing passage) and an inclined position (blocking passage). This dynamic adjustment allows the system to adapt to different operational needs, effectively retaining lighter solids when the grating is in the inclined blocking position while maintaining flow when horizontal.
Solution Approach 2:
The patent applies preliminary action by positioning the movable grating in advance to block the opening before lighter solids can escape. The system proactively adjusts the grating to the inclined blocking position to prevent waste escape, rather than reacting after solids have already passed through. This preventive approach ensures lighter solids are retained before they can cause harm to downstream equipment.
2Ease of operation
If manual cleaning of the grating is performed, then waste is removed from the grating, but significant manual labor is required and cleaning efficiency is low
Solution Approach 1:
The patent applies self-service by implementing an automated cleaning mechanism that cleans the grating without requiring manual intervention. The cleaning comb, driven by a motor, automatically moves along the grating bars to remove accumulated waste. This self-cleaning system eliminates the need for operators to manually rake and remove waste, significantly reducing labor while improving cleaning efficiency and productivity.
Solution Approach 2:
The patent applies mechanics substitution by replacing the manual mechanical cleaning process with an automated motor-driven cleaning comb mechanism. Instead of operators using rakes to manually remove waste, a motorized comb systematically cleans the grating bars. This substitution of manual mechanical action with automated mechanical systems improves both ease of operation and cleaning productivity.
3Quantity of substance
If the grating is made with smaller clearance to retain lighter solids, then more waste is retained, but the opening becomes clogged more frequently and flow is restricted
Solution Approach 1:
The patent applies dynamics by using a movable grating that can adjust its position to balance retention and flow. When retention is needed, the grating inclines to block the opening; when flow is prioritized, it returns to horizontal position. This dynamic adjustment allows the system to retain lighter solids effectively without permanently restricting flow, as the grating can be positioned to allow passage when appropriate.
Solution Approach 2:
The patent applies periodic action through the automated cleaning mechanism that periodically removes accumulated waste from the grating. This periodic cleaning prevents clogging and maintains flow capacity, allowing the grating to operate with smaller clearances for better retention without suffering from permanent blockages. The regular cleaning cycles ensure flow restrictions are minimized while maintaining effective waste retention.
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 device enhances the retention of both heavy and light solid waste, reducing manual labor and improving the efficiency of wastewater treatment by preventing lighter solids from entering the pumping chamber and automating the waste removal process.
Implementation Method 1
A mechanism in the form of a cleaning comb, including a cleaning rake and being provided with a mechanism which moves it to the retention grating positioned opposite the opening leading to a pumping chamber for the purpose of detaching from same the waste which may remain between the bars thereof
Implementation Method 2
While heavier solid waste entrained by the stream of wastewater upon entry to the coarse solids chamber settles by itself and is deposited at the bottom of the coarse solids chamber since it has a specific weight greater than that of water
Implementation Method 3
Finally, it also incorporates a cleaning brush mechanism for cleaning the grating which is positioned in the upper portion at rest
Data Source
AI summary
The invention relates to a screening device in coarse solids chambers in a wastewater treatment plant, which has a coarse solids chamber (1) in which heavier solids will settle directly at the bottom, whereas lighter solids seek to escape through an opening (3) leading to a pumping chamber (2), having a first retention grating (4) positioned covering the opening (3) communicating both chambers (1, 2), on which a cleaning mechanism acts periodically; and a second grating (4) identical to the aforementioned one initially at rest in the upper part, above the water level, where by means of respective movement mechanisms both gratings (4) are interchanged from the resting position to the operating position opposite the opening (3). It also has a cleaning brush mechanism (5) for cleaning the gratings (4) when they are positioned in the upper portion at rest.