Dynasand is a continuous sand filtration system designed for the efficient removal of suspended solids from water and wastewater. Using an innovative moving-bed design, it allows for continuous filtration and sand cleaning without system shutdown, ensuring stable operation, low maintenance, and consistent effluent quality. Ideal for municipal, industrial, and tertiary treatment applications, Dynasand provides a compact, energy-efficient, and sustainable water treatment solution.
Continuous sand filtration system with low energy use, no backwash downtime, and consistently high effluent quality.
Operates without interruption, providing clean effluent at all times.
Eliminates downtime by using an internal sand washing system.
Efficient airlift and gravity flow design reduce power usage.
Space-saving vertical design with minimal mechanical components.
Automatic operation minimizes supervision and service needs.
Over 15,000 installations worldwide demonstrate stable, efficient operation.
Weilan designs plans and drawings and supplies both standardized and bespoke water treatment systems, backed by over 200 completed projects.
| Model | Filter area (m²) | Filter layer Depth (m) | Volume (m3/h) | Diameter (mm) | Equipment height (mm) | Maximum air consumption m³/h (0.4MPa) |
|---|---|---|---|---|---|---|
| WL-10 | 1 | 1.5-2.0 | 5～10 | 1150 | 4300～4800 | 2.5 |
| WL-15 | 1.5 | 1.5-2.0 | 10～15 | 1400 | 4600～5100 | 3 |
| WL-20 | 2 | 1.5-2.0 | 15～20 | 1600 | 5000～5500 | 4 |
| WL-30 | 3 | 1.5-2.0 | 20～30 | 2000 | 5400～5900 | 6 |
| WL-40 | 4 | 1.5-2.0 | 30～40 | 2260 | 5800～6300 | 8 |
| WL-55 | 5.5 | 1.5-2.0 | 40～55 | 2650 | 6200～6700 | 10 |
| WL-60 | 6 | 1.5-2.0 | 55～60 | 2770 | 6500～7000 | 12 |
The DynaSand filter is based on the counter flow rinciple.
The water to be treated is admitted through the inlet distributor in the lower section of the unit and is cleaned as it flows upwards through the sand bed, prior to discharge through the filtrate outlet at the top.
The sand containing the entrapped solids is conveyed from the tapered bottom section of the unit, by means of an airlift pump, to the sand washer at the top.
Cleaning of the sand commences in the pump itself, in which impurities are separated from the sand grains by the turbulent mixing action.
The contaminated sand spills from the pump outlet into the washer labyrinth, in which it is washed by a small counter current flow of clean water.
The separated solids are discharged through the wash water outlet, while the grains of clean sand (which are heavier) are returned to the sand bed.
As a result the bed is in slow, constant downward motion through the unit. Compressed air for the sand pump is provided via the control panel.
Thus, water purification and sand washing both take place continuously, enabling the filter to remain in service without interruption.
Henan Weilan Water Treatment Technology Co., Ltd. (est. 2011) specializes in turnkey package
water treatment plants — modular, skid- and containerized systems pre-tested for rapid
on-site deployment.
Backed by an experienced R\&D and EPC team and ISO9001 quality management, Weilan
delivers engineered design, manufacturing, commissioning and lifecycle support for
municipal and industrial water projects.
Provide a total solution for safe drinking water and sewage treatment.
Full design services — standard modules and bespoke systems
The primary difference is the uninterrupted mode of operation. Unlike conventional filters, the DynaSand does not need to be taken out of service for backwashing. Instead, the sand is cleaned continuously by an internal washing system, ensuring availability is maximized.
Cleaning begins inside the airlift pump, where turbulent mixing separates impurities from sand grains. The contaminated sand then spills into a washer labyrinth where it is washed by a small counter-current flow of clean water. The separated solids are discharged through a wash water outlet, while the heavier, clean sand grains are returned to the sand bed.
No. One of the key process improvements is that DynaSand can handle high suspended solids without the need for pre-treatment.
The equipment height varies by model, ranging from 3500–4000 mm for the smallest unit (WL-05) up to 6500–7000 mm for the largest unit (WL-60). The diameter ranges from 800 mm to 2770 mm.
Across all models (WL-05 through WL-60), the filter layer depth is maintained at 1.5–2.0 meters.
