Microsand Sedimentation Tank (High-Density Rapid Settling): Core Advantages and Technical Parameters Overview
What exactly makes the microsand (high-density rapid settling) sedimentation tank so strong, and what magnitude are its key parameters? The following parameters are typical range references; actual values vary with raw water quality, chemical combination, and operating conditions, and are ultimately determined by on-site bench tests.
I. Six Core Advantages
① High surface loading, space-saving Sand-laden flocs settle extremely fast, and the inclined tube zone operates at high surface loading, greatly reducing footprint compared to traditional sedimentation tanks—especially practical for upgrading projects.
② Stable effluent, shock-resistant Strong adaptability to flow and water quality fluctuations, as well as low-temperature and low-turbidity conditions, with stable and controllable effluent SS/turbidity.
③ Fast start-up, start-stop on demand Purely physicochemical process with no biochemical acclimation period; effective immediately upon startup, particularly suitable for intermittent operation and emergency treatment.
④ Microsand circulation, extremely low loss Closed-loop operation with cyclone recovery; microsand is dosed once and used long-term, with minimal makeup and low operating costs.
⑤ Compact modular design, plug-and-play Integrated steel tank, above-ground installation, flexible parallel expansion, friendly to retrofits and decentralized point sources.
⑥ Synergistic phosphorus removal, a powerful upgrading tool Synergizes with chemical phosphorus removal agents to simultaneously achieve advanced phosphorus removal and SS removal, supporting Grade 1A / quasi-Class IV upgrading.
II. Main Technical Parameters (Range Reference)
Item | Parameter Range / Description | Remarks |
|---|---|---|
Single-unit capacity | 10 – 500 m³/h (modular parallel expansion available) | Customized by model |
Microsand type | Fine quartz sand, particle size approx. 100 – 150 μm | Dosed once, recycled |
Coagulant | PAC / aluminum sulfate / polyferric, etc. | Selected based on water quality |
Coagulant aid | Anionic PAM | Low dosage |
Inclined tube zone surface loading | Approx. 30 – 80 m/h | Far higher than traditional sedimentation |
Total hydraulic retention time | Approx. 10 – 20 min | Including mixing, flocculation, and separation |
SS / turbidity removal rate | Approx. 85% – 95% or higher | Depends on raw water quality |
Total phosphorus removal rate | Approx. 80% – 90% (with phosphorus removal chemicals) | Commonly used in upgrading projects |
Effluent SS | Can be stably ≤ 10 mg/L (with chemicals) | Better under advanced phosphorus removal conditions |
Microsand loss | Extremely low (cyclone recovery closed loop) | Periodic small replenishment |
* The above are typical range reference values; actual removal performance varies with raw water quality, chemical combination, and operating conditions, and should be determined by bench tests or on-site parameter tuning.
III. How to Interpret the Parameters (Item-by-Item)
Surface loading 30–80 m/h: This is the most intuitive "identity tag" of the microsand sedimentation tank compared to traditional sedimentation. Traditional sedimentation tank surface loading is typically on the order of a few tenths of a millimeter per second to just over one meter per hour, while this can reach tens of meters per hour—the higher the value, the smaller the sedimentation area required for the same effluent flow.
Retention time 10–20 min: The entire process takes only about ten-plus minutes, with small tank volume and fast reaction, which is why it can "start and stop on demand and achieve rapid effectiveness."
Microsand 100–150 μm: The particle size is screened—too coarse makes it hard to float/recover with flocs, too fine reduces the weighting effect and recovery efficiency; this range is a relatively mature engineering value.
Removal rate ranges: SS/turbidity 85%–95% or higher, total phosphorus 80%–90% (with chemicals), all typical references; actual levels depend on the form of suspended solids and phosphorus in the raw water, chemical dosage, and hydraulic conditions.
IV. Advantage Comparison with Traditional Sedimentation Tanks
Dimension | Traditional coagulation sedimentation tank | Microsand sedimentation tank |
|---|---|---|
Surface loading | Low | High (several times traditional) |
Footprint | Large | Small |
Start-up / effectiveness | Relatively slow | Fast, start-stop on demand |
Shock load resistance | Moderate | Strong |
Adaptability to space-constrained retrofits | Poor | Good |
Want a parameter configuration tailored to your water quality?
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