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The Removal Ratio formula calculates the proportion of sludge removed from a sedimentation tank by comparing the falling speed of particles to their settling velocity. It provides a quantitative measure of sedimentation efficiency.
The calculator uses the formula:
Where:
Explanation: The formula represents the ratio between the actual falling speed of particles and their terminal settling velocity in still fluid conditions.
Details: Calculating the removal ratio is essential for designing and optimizing sedimentation processes in water treatment plants, wastewater treatment facilities, and various industrial separation processes.
Tips: Enter both falling speed and settling velocity in meters per second (m/s). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What does a removal ratio greater than 1 indicate?
A: A ratio greater than 1 suggests that particles are falling faster than their theoretical settling velocity, which may indicate additional forces or conditions affecting sedimentation.
Q2: What is the ideal removal ratio range?
A: The ideal ratio depends on the specific application, but typically values closer to 1 indicate optimal sedimentation efficiency.
Q3: How is falling speed measured in practice?
A: Falling speed can be measured through timed descent experiments or calculated based on particle properties and fluid dynamics principles.
Q4: What factors affect settling velocity?
A: Settling velocity is influenced by particle size, density, shape, fluid viscosity, and temperature.
Q5: Can this formula be used for all particle types?
A: The formula provides a general approach, but specific particle characteristics and fluid conditions should be considered for accurate results in specialized applications.