Perforated Drum Slurry Separator for Sand Removal
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Solution Overview
Problem
Existing separation systems for slurry materials, particularly in dairy farms, face challenges in efficiently removing small, heavy particulates like sand from the slurry without suspending them in rinse water, leading to bypass and inefficiencies in further processing such as anaerobic digestion and composting.
Innovation Solution
A separation system comprising a housing with a perforated cylindrical drum assembly supported below the liquid level, where the drum is rotated to separate solids from liquids, with the perforations allowing heavier particulates like sand to pass through while larger particles are displaced by screw flights, ensuring effective separation and collection of sand from the slurry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional separation systems are used to remove heavy particulates from slurry, then large amounts of sand can be removed, but turbulence causes fine sand to be suspended in rinse water and bypass the system
Solution Approach 1:
The separation system is divided into multiple distinct functional zones: a settling zone where sand settles out of slurry, a rinse zone where settled sand is rinsed, and a discharge zone where clean sand is collected. This segmentation prevents turbulence from mixing settled sand with rinse water, eliminating the bypass problem while maintaining high removal efficiency.
Solution Approach 2:
A baffle wall is introduced as an intermediary structure between the settling zone and discharge zone. This baffle prevents direct flow paths that would cause turbulence, allowing settled sand to be rinsed and collected without being suspended back into the rinse water stream.
2Productivity
If turbulence is increased to improve mixing and contact, then separation speed increases, but fine sand becomes suspended and is carried away with rinse water
Solution Approach 1:
The system segments the flow path into distinct zones with controlled turbulence levels. The settling zone allows gentle sedimentation, the rinse zone provides controlled rinsing without excessive turbulence, and the discharge zone collects sand separately. This enables efficient separation without suspending fine sand.
Solution Approach 2:
The system uses vertical zonation to separate different functions at different heights. Settled sand accumulates at the bottom in the settling zone, while rinse water flows over the sand in the rinse zone above. This vertical arrangement allows gravity-driven separation without horizontal turbulence that would suspend particles.
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 system effectively separates sand from slurry materials, preventing it from being carried away with rinse water, thereby improving the efficiency of subsequent processing steps like water extraction, composting, and anaerobic digestion by maintaining sand within the system for reuse as bedding material.
Implementation Method 1
A separation system comprising a housing with a perforated cylindrical drum assembly supported below the liquid level, where the drum is rotated to separate solids from liquids
Implementation Method 2
the perforations allowing heavier particulates like sand to pass through while larger particles are displaced by screw flights
Data Source
AI summary
A separation system for separating solids from a slurry of waste material, the separation system comprising a housing, a drum assembly, and a drive assembly. The housing defines a collection chamber. Liquid within the collection chamber defines a liquid level. The drum assembly defines a perforated cylindrical wall and the drum assembly is supported such that at least a portion of the drum assembly is below the liquid level. The drive assembly rotates the drum assembly relative to the housing.