Sand separator (sand trap) with descending and ascending flow is used as a mechanical treatment facility, purifying wastewater from small fractions, as well as large inclusions. The body of the unit is made of reinforced fiberglass, which excludes deformation under the loads of soil and groundwater. Increased durability of the product is provided by the method of continuous winding.

Treatment technology

Initially the wastewater enters the inner chamber, where the flow velocity is reduced. Further purification of water from mechanical impurities is provided by the forces of downward and upward flow. In order to ensure this process the inner zone of the sand trap is equipped with a wall separating the upward and downward flow areas.

As wastewater flows downward the flow loses its conveying capacity, thereby depositing suspended solids.

Intensive separation of liquid and solid phases occurs at the turn of the flow. The mechanically cleaned wastewater then flows upward through the collection tray and is discharged through the discharge pipe.

Prior the installation an excavation pit should be arranged: excavation, water level reduction, sheet piling of the excavation walls (if necessary) and a  reinforced concrete plate fixing the sand separator  with synthetic bands (or corrosion-proof steel bands on the rubber seal) to prevent the floating up under groundwater pressure. Once the sand separator is fixed, backfilling is performed, layer by layer with compaction by a vibrating plate, simultaneously on both sides of the sand separator housing. After the input and output branch pipes of the sand separator have been connected to the rainwater treatment system collector, the service (maintenance) well is connected and the secondary backfill is performed with layer-by-layer compaction. Once connected to the collector of the rain water treatment system and backfilled the sand separator is ready for operation. More details can be found in the operating manual.

It is recommended to maintain a sand separator manufactured by NTT-Peresvet at least once a year during the end of the operating season. Maintenance includes pumping out water and accumulated sediment. If a sand separator is equipped with sensors it is necessary to dismantle them from the separator housing when pumping out water and sediments to avoid breakage of sensors, then clean from dirt and test their operability. After pumping out the accumulated sludge and re-installing the sensors, the sand separator should be filled with water up to the height (level)of the output branch pipe.

Q - flow rate: 1-250 l/s

D - housing diameter: 1000-4000 mm

L - housing length: 3000-12000 mm

A - input pipe height: 850-3300 mm

B - output pipe height: 800-3000 mm

N - input/output pipe diameter: 100-700 mm

H - track laying depth: according to the customer's design