Performance Comparison of Ceramic Filter Media with Different Particle Sizes
A brief comparison of the performance of ceramic filter media with different particle sizes.
Performance Comparison of Ceramic Filter Media with Different Particle Sizes
The particle size of ceramsite filter media directly affects filtration accuracy, head loss, and backwashing performance; different particle sizes are suitable for different processes.
Particle Size Range and Applications
Particle Size Range | Common Applications |
0.5-2mm | Precision filtration, water treatment plants |
2-5mm | Conventional filtration, multi-media filters |
3-8mm | Biological aerated filters (BAF) |
5-20mm | Constructed wetlands |
20-40mm | Supporting layers |
Effect of particle size on performance
Performance | Small particle size | Large particle size |
Filtration accuracy | High | Low |
Pollution interception capacity | Strong | Weak |
Head loss | High | Small |
Backwashing difficulty | High | Low |
Biofilm formation | Fast | Slow |
Selection Recommendations
Tap Water Filtration: 2-5mm, high precision, but rapid increase in head loss.
Biological Aerated Filter (BAF): 3-8mm, balances biofilm formation and clogging prevention.
Constructed Wetlands: 5-20mm, good permeability, often multi-layered (fine upper layer, coarse lower layer).
Support Layer: 20-40mm, only provides support.
Particle Size Uniformity
Non-uniformity coefficient K≤1.5 indicates uniform particle size, resulting in longer filtration cycles and lower backwashing frequency; K＞2.0 is prone to stratification and flow deviation, leading to poorer performance.
Summary
Small particle size provides high filtration precision but high resistance, while large particle size provides low resistance but lower precision. For tap water filtration, choose 2-5mm; for BAF, choose 3-8mm; for constructed wetlands, choose 5-20mm. Uniform particle size (K≤1.5) represents the current development direction for filtration technology.