Clarifier Sludge Withdrawal via Above-Ground Pumping
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Solution Overview
Problem
Conventional wastewater treatment systems face challenges in efficiently withdrawing settled sludge from clarifier tanks due to issues like corrosion, clogging, and high costs associated with underground pipe maintenance and replacement, particularly in retrofitting existing systems.
Innovation Solution
A clarifier system is designed to withdraw settled sludge from the bottom of the tank upwardly through a central column and radially outwardly using a special manifold device and a sludge withdrawal pump, eliminating the need for underground pipes by securing the exit pipe to a fixed walkway and utilizing a manifold device with radial branch pipes to collect and elevate the sludge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If settled sludge is withdrawn through an underground pipe beneath the concrete floor, then the sludge can be discharged from the clarifier tank, but the pipe is subject to corrosion, clogging, and failure making maintenance difficult and costly
Solution Approach 1:
The invention extracts the sludge withdrawal system from the underground concrete floor and relocates it to an above-ground position on the tank wall. The pump and withdrawal mechanism are mounted externally, eliminating the buried pipe that was prone to corrosion and clogging. This allows the same sludge discharge function to be achieved without the reliability problems of underground piping.
Solution Approach 2:
The invention changes the spatial dimension of the sludge withdrawal system by moving it from a horizontal underground configuration to a vertical above-ground configuration. The withdrawal pipe now extends upward from the sludge layer to an external pump mounted on the tank wall, utilizing the vertical dimension to avoid the problems of horizontal buried piping.
2Adaptability or versatility
If an underground exit pipe is installed beneath the concrete floor for sludge discharge, then the clarifier can be retrofitted with sludge withdrawal capability, but the installation is difficult and very costly
Solution Approach 1:
The invention extracts the pump and withdrawal mechanism from the concrete floor structure and mounts it externally on the tank wall. This eliminates the need to break into and install piping within the concrete floor, dramatically simplifying retrofit installation while maintaining the ability to add sludge withdrawal capability to existing clarifiers.
Solution Approach 2:
The invention segments the sludge withdrawal system into separate components: the withdrawal pipe within the tank, the transition section at the tank wall, and the external pump assembly. This modular segmentation allows each component to be installed independently, with the external pump mounted separately on the tank wall rather than requiring integration into the concrete floor structure.
3Productivity
If the pump is positioned to withdraw sludge from beneath the floor, then sludge can be removed, but servicing of the pipe and pump becomes complex
Solution Approach 1:
The invention extracts the pump from the underground location and positions it externally on the tank wall at an accessible height. This allows maintenance personnel to easily access, service, and repair the pump without needing to break into the concrete floor or work in confined underground spaces, while the withdrawal pipe remains positioned to efficiently remove sludge from the tank bottom.
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 solution allows for efficient and cost-effective sludge removal without underground pipes, reducing maintenance complexities and increasing outflow capacity, while being compatible with both new and retrofitted systems.
Implementation Method 1
a pump to withdraw settled sludge from the bottom of the tank upwardly through the tank's center column
Implementation Method 2
a special manifold device similar to what is shown in U.S. Pat. No. 5,340,485, but installed in a different way and for a different purpose. In the invention the special manifold device, with one or more side branch pipes extending from a central hub outwardly to and through a peripheral wall
Data Source
AI summary
In a wastewater treatment plant a clarifier is fitted with piping and a pump to withdraw settled sludge from the bottom of the tank upwardly through the tank's center column and radially out from the clarifier via an exit pipe above the liquid level. The exit pipe can be supported on a fixed walkway. At the bottom end of the central tower is a manifold device for collecting settled sludge, including an annular preferably cylindrical wall, a central pipe hub and at least one pipe branch extending from an opening in the cylindrical wall radially inwardly to the central hub. Sludge is drawn up through a vertical sludge return pipe by a pump located preferably above the tank's liquid level, drawing sludge into pipe branches of the manifold device and through the hub to the sludge return pipe, then out through the exit pipe.