Longitudinal Sieve Grate Wastewater Screening
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Solution Overview
Problem
Existing screening devices for wastewater have limitations in separation efficiency and throughput capacity due to fixed geometry and spacing of grating bars, which are constrained by the sewer cross-section, leading to suboptimal performance.
Innovation Solution
A screening device with a sieve grate that extends in the flow direction of wastewater, featuring multiple drive wheels and clearing elements on a closed loop path, allowing for adjustable sieve grate width and spacing of grating bars, and a barrier wall to redirect wastewater, enhancing separation efficiency and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the spacing of the grating bars is reduced to increase separation efficiency, then the separation efficiency is improved, but the throughput capacity decreases
Solution Approach 1:
The invention changes the orientation of the screen surface from transverse (perpendicular to flow) to longitudinal (parallel to flow) direction. This dimensional reorientation allows the sieve grate to extend in the flow direction, increasing the effective screening area without reducing grating bar spacing, thus maintaining both separation efficiency and throughput capacity
2Productivity
If the screen surface width is increased to improve throughput capacity, then the throughput capacity is improved, but the device becomes constrained by the sewer cross-section
Solution Approach 1:
The screen surface is reoriented to extend in the longitudinal flow direction rather than transversely across the sewer. This allows the screening device to utilize the length of the sewer rather than being constrained by its width, effectively increasing throughput capacity without being limited by cross-sectional dimensions
Solution Approach 2:
The invention introduces a movable screen surface that can be adjusted in width and position along the flow direction. This dynamic adjustment capability allows the device to adapt to different sewer configurations and optimize both throughput capacity and separation efficiency based on specific installation conditions
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
This design achieves high separation efficiency and increased throughput capacity by allowing for adjustable sieve grate dimensions and effective redirection of wastewater, independent of sewer cross-section constraints.
Implementation Method 1
a fixedly situated sieve grate having multiple mutually spaced grating bars for separating contaminants from the wastewater
Implementation Method 2
The drive means are guided on a closed loop path with the aid of at least one drive wheel in each case
Implementation Method 3
multiple clearing elements, which are connected to the drive means, for removing the contaminants, which have been separated out by the sieve grate, from the sieve grate
Data Source
AI summary
A screening device for separating out and removing contaminants from wastewater includes two continuous conveyors, which are mounted with clearance from each other. Each has a drive wheel that is guided on a circular path and includes a fixedly situated bar screen, which includes multiple mutually spaced grating bars for removing contaminants from the wastewater. Each bar screen includes multiple clearing elements, which are connected to the conveyor for removing from the bar screen the contaminants that have been separated out by the bar screen. The bar screen forms a fixed screen surface that extends, in the intended installation position of the screening device, essentially in the flow direction of the wastewater reaching the screening device.