Electroosmosis Filter Bag Sludge Dewatering
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Solution Overview
Problem
Existing methods for treating construction sludge, such as plate-frame pressure filtration, belt pressure filtration, and centrifugation, are inefficient in reducing the high water content of sludge, which is a significant environmental concern due to the large amounts produced in underground and tunnel excavation projects in China.
Innovation Solution
A deep sludge dewatering method using electroosmosis with filter bags, where a filter bag is placed on a slope with a cathode electrode, filled with sludge, and an anode electrode is applied, connected to a DC power supply for electroosmosis, allowing water to flow down the slope, reducing moisture content effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plate-frame pressure filtration method is used, then processing is simple, but processing efficiency is low
Solution Approach 1:
The sludge dewatering process is divided into two distinct stages: initial gravity drainage and subsequent electroosmosis dewatering. This segmentation allows each stage to optimize its function - gravity drainage handles initial water removal simply, while electroosmosis achieves deep dewatering efficiently, resolving the contradiction between process simplicity and processing efficiency.
Solution Approach 2:
The patent replaces the purely mechanical pressure filtration system with an electroosmosis system that uses electrical fields to drive water removal. This substitution enables deeper dewatering capability while maintaining operational simplicity, as the electroosmosis process automatically continues until equilibrium is reached without requiring complex mechanical adjustments.
2Loss of time
If belt pressure filtration or centrifugation is used, then processing time is short, but moisture content in treated mud is high
Solution Approach 1:
The patent replaces mechanical pressure filtration and centrifugation with an electroosmosis system that uses electrical fields to remove water. This substitution enables the system to achieve low moisture content (below 30%) while maintaining short processing time, as the electrical field continuously drives water migration through the sludge matrix until equilibrium is reached.
Solution Approach 2:
The patent changes the dewatering mechanism from mechanical force to electrical field-driven electroosmosis. This parameter change enables effective removal of bound water that mechanical methods cannot access, achieving moisture content below 30% while maintaining efficient processing time through continuous electrical field application.
3Quantity of substance
If deep dewatering is achieved, then moisture content is reduced, but processing complexity increases
Solution Approach 1:
The patent segments the dewatering process into two stages with different mechanisms - initial gravity drainage followed by electroosmosis. This segmentation achieves deep dewatering (moisture content below 30%) while keeping the overall process relatively simple, as each stage uses an appropriate method for its specific function without requiring complex integrated systems.
Solution Approach 2:
The patent introduces filter bags as an intermediary component that enables electroosmosis to occur within contained sludge volumes. These bags provide a controlled environment for electrical field application and water collection, simplifying the overall system design while achieving deep dewatering through the electroosmosis mechanism.
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 method achieves a moisture content of less than 30% in the sludge, enabling efficient dewatering, resource recycling, and simplifying the process without requiring large filtration equipment, allowing for the reuse of sludge in construction projects.
Implementation Method 1
carrying out energization for electroosmosis so that water flows down the slope
Implementation Method 2
placing a filter bag on a slope on which a cathode electrode is arranged
Data Source
AI summary
A deep sludge dewatering method using electroosmosis with filter bags, including (1) placing a filter bag on a slope on which a cathode electrode is arranged; (2) injecting sludge into the filter bag, and after the filter bag is filled with the sludge, closing an inlet of the filter bag; and (3) laying an anode electrode on the filter bag filled with the sludge, and connecting the cathode electrode and the anode electrode to a DC power supply via an electric wire, and carrying out energization for electroosmosis so that water flows down the slope. The present invention can be used for recycling of the sludge produced in underground and tunnel excavation projects, and has the advantages of large processing capacity, simple process, good treatment effect and available resource recycling.