Company news about Mechanism and Principles of Microsand Ballasted Sedimentation Tanks

Mechanism and Principles of Microsand Ballasted Sedimentation Tanks

2025-03-11

The microsand ballasted high-efficiency sedimentation process is a solid-liquid separation clarification technology (similar to traditional sedimentation methods) that physically removes suspended solid particles from water. It also employs physico-chemical removal of dissolved phosphates through the addition of coagulants (aluminum/iron salts). By introducing microsand into the water, flocculation reactions form sand-core flocs, which are ultimately separated from the water. The high density of sand-containing flocs enables rapid settling, resulting in a surface loading rate far exceeding that of conventional high-efficiency sedimentation tanks.

Microsand Properties:

Material: Natural quartz sand with SiO₂ content > 98%.
Particle size (d₁₀): 80–150 μm (adjusted based on application requirements).
Density: 2650 kg/m³.

Key Advantages:

Enhanced Coagulation: Microsand increases collision frequency among particles, improving coagulation efficiency.
Rapid Settling: The increased density of flocs accelerates sedimentation, significantly boosting the surface loading capacity of the tank.
Sludge Compatibility: Microsand does not cause abrasion to existing sludge treatment systems. Sand-containing sludge can be conventionally disposed of or incinerated without adverse effects.

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