Adjustable Grit Chamber Flow Control for Low Velocity
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Solution Overview
Problem
Existing grit removal systems in wastewater treatment face challenges with low flow rates, leading to premature grit settlement in influent channels, which can result in prolonged grit accumulation and inefficient removal.
Innovation Solution
A grit removal unit with an adjustable influent channel divider wall and gates, along with an output guide member, allows for selective flow management and velocity control to prevent grit settlement during low flow rates, ensuring effective grit capture and removal across varying flow conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the influent channel is designed to handle high flow rates, then the system can accommodate peak wastewater volumes, but at low flow rates the velocity is significantly reduced causing premature grit settlement in the influent channel
Solution Approach 1:
The influent channel is divided into multiple parallel channels using divider walls. This segmentation allows the system to maintain adequate flow velocity in each individual channel even when total flow is low, preventing premature grit settlement while still accommodating high flow rates when all channels are active.
Solution Approach 2:
The system uses adjustable gates to dynamically control the number of active influent channels based on flow rate conditions. During low flow periods, fewer channels are activated to maintain velocity; during high flow periods, more channels are opened to handle the increased volume, optimizing performance across varying conditions.
2Device complexity
If a fixed influent channel configuration is used, then the structure is simple and easy to maintain, but it cannot adapt to varying flow rates causing grit settlement during low flow periods
Solution Approach 1:
Adjustable gates are installed in the influent channel to enable dynamic configuration changes based on flow rate conditions. These gates allow operators to open or close specific channels to maintain optimal flow velocity, providing adaptability to varying flows while keeping the overall structural design relatively simple.
Solution Approach 2:
The influent channel is segmented into multiple parallel pathways separated by divider walls. This segmentation enables flexible activation of individual channels through the adjustable gates, allowing the system to adapt to different flow rates without requiring a completely complex reconfigurable structure.
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 prevents grit settlement and ensures efficient removal by maintaining adequate flow velocity during low flow periods and optimizing flow paths, maintaining system performance across a range of flow rates.
Implementation Method 1
allows for selective flow management and velocity control to prevent grit settlement during low flow rates
Implementation Method 2
Vortex-type grit chamber
Implementation Method 3
a cyclone separator which further concentrates the grit
Implementation Method 4
a sloped bottom surface extending between the input opening bottom surface and the chamber bottom surface
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A grit removal unit including an influent channel directing wastewater with grit into a round grit removal chamber and an effluent channel receives wastewater output from the chamber. A divider wall extends upwardly between the sides of the influent channel, and gates at the upstream end of the divider wall are adjustable to selectively open channel portions on opposite sides of the divider wall. An output guide member is mounted to allow selective adjustment of output flow opening width "c" to the effluent channel. The output guide member has a horizontal bottom extending from the chamber into the effluent channel across the width of the output opening, and a guide wall extending upwardly from the guide member bottom. The guide wall has a forward end spaced from the chamber annular vertical wall to define the output flow opening width therebetween.