Shearing Paunch Sludge with DAF Float
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Solution Overview
Problem
De-watered paunch-sludge is difficult to liquefy due to its high resistance to shearing, as the long, thin strands of solid material are resistant to being drawn into the shearing blades, leading to inefficient processing and equipment wear.
Innovation Solution
Mixing de-watered paunch-sludge with de-watered DAF-float, which breaks down into a thick viscous liquid, increases the viscosity and allows the shearing blades to effectively draw in and break up the strands, releasing captive water and reducing friction, thereby facilitating liquefaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If de-watered paunch-sludge is subjected to shearing, then liquefaction should occur, but the long thin strands resist being drawn into the shearing blades causing high resistance and inefficient processing
Solution Approach 1:
The patent changes the physical-chemical parameters of the sludge by adjusting pH levels and adding chemical agents to modify the properties of the long thin strands, making them more susceptible to shearing and reducing their resistance to being drawn into the blades
Solution Approach 2:
The patent introduces chemical intermediaries that act as mediators between the shearing blades and the resistant strands, facilitating the drawing in of strands by reducing surface tension or modifying the interaction forces between the blades and the fibrous material
2Productivity
If de-watered paunch-sludge is sheared directly, then processing should proceed, but equipment wear increases due to high resistance
Solution Approach 1:
The patent modifies operational parameters such as shearing speed, blade geometry, and sludge composition to reduce the mechanical stress and friction between the blades and the resistant strands, thereby minimizing equipment wear while maintaining processing continuity
Solution Approach 2:
The patent applies preliminary treatments to the sludge that cushion or pre-soften the resistant strands before they encounter the shearing blades, reducing the impact and friction that cause equipment wear during the shearing process
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 mixture of paunch-sludge and DAF-float creates a homogeneous liquid with reduced viscosity resistance, allowing for efficient liquefaction and homogenization, simplifying disposal and potentially providing a valuable fertilizer product.
Implementation Method 1
Mixing de-watered paunch-sludge with de-watered DAF-float, which breaks down into a thick viscous liquid, increases the viscosity
Implementation Method 2
When sludge that contains cells is sheared, the intact biological cells are torn apart and ripped open
Implementation Method 3
releasing captive water and reducing friction, thereby facilitating liquefaction
Data Source
AI summary
Paunch-sludge from an abattoir is mixed with the fatty DAF-float from an abattoir, and placed in a shearing vessel. The mixture of the two material thickens the medium in which the matted strands are contained, enabling shearing to be more effective; so much so that paunch-sludge can now be sheared to a homogeneous liquid. The technique can be used with other sludges and other fatty waste materials.