Suction Pipe Clarifier Conversion Without Concrete Penetration
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Solution Overview
Problem
Converting a suction duct clarifier to a suction pipe clarifier is disruptive and costly due to the need to remove equipment, demolish concrete, and install new components, making many treatment plants hesitant to undertake this conversion.
Innovation Solution
A new sludge discharge vertical downpipe with a 90° elbow is welded to the center column, and a sludge return device is secured to the outside of the column, allowing sludge to be transferred without penetrating the concrete floor, along with the addition of an elevated sludge collection box and PVC pipes to facilitate hydraulic flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a suction duct clarifier is converted to a suction pipe clarifier by removing equipment and demolishing concrete, then the clarifier performance is improved, but the conversion cost and disruption increase significantly
Solution Approach 1:
The invention divides the conversion process into separate modular components: an elevated sludge collection box, sludge uplift pipes connected to rake arms, and a vertical sludge discharge pipe. This segmentation allows each component to be installed independently without requiring demolition of the concrete floor, thereby maintaining improved clarifier performance while significantly reducing conversion cost and disruption.
2Ease of operation
If concrete floor demolition is performed to install new piping, then proper sludge flow paths are achieved, but construction time and expense increase
Solution Approach 1:
The invention relocates the sludge collection function from the floor level to an elevated position above the clarifier floor. The elevated sludge collection box receives sludge through uplift pipes from the rake arms, and discharges it vertically downward through a new pipe. This dimensional change allows proper sludge flow paths to be achieved without penetrating or demolishing the concrete floor, thereby reducing construction time while maintaining operational effectiveness.
3Adaptability or versatility
If existing equipment is removed and new components are installed, then the suction pipe clarifier system is achieved, but the conversion complexity increases
Solution Approach 1:
The elevated sludge collection box serves multiple functions: it collects sludge from multiple rake arms through uplift pipes, provides a centralized discharge point for the vertical sludge pipe, and maintains the rotating seal against the center column. This multi-functionality reduces the number of separate components needed and simplifies the overall conversion process while achieving the desired suction pipe clarifier system configuration.
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
Enables an efficient and inexpensive conversion of suction duct clarifiers to suction pipe clarifiers without disturbing the existing concrete floor, reducing disruption and costs while maintaining clarifier performance.
Implementation Method 1
Raked and collected sludge rises up through these pipes and into the sludge collection box, by differential hydraulic pressure, since the liquid level in the sludge collection box is lower than the liquid level in the tank
Implementation Method 2
This pipe is under suction, so that suction exists in the sludge collection drum and draws the sludge to that drum from suction ducts supported by the rake arms
Data Source
AI summary
In a wastewater treatment system, a suction duct clarifier is converted to a suction pipe clarifier without penetrating existing concrete at the base of the tank. An elevated sludge collection box is added, positioned on the center column to rotate with rake arms, and a series of sludge riser pipes extend from the rake arms up into the sludge collection box for sludge delivery by hydraulic pressure differential. A sludge discharge downpipe is provided within the center/influent column for delivery of sludge from the collection box, and at the bottom of this pipe, above the tank floor, the discharge pipe exits through an opening in the center/influent column. At the outside of this opening is a sludge transfer box that receives sludge exiting the discharge pipe and conveys it down through the existing floor opening and to the existing under-floor RAS return pipe.