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Hydrasand

Continuous sand filter

Sand filtration is a well-known technology for separation of small suspended solids particles in water. The Hydrasand continuous sand filter is an economical sand filter for continuous cleaning of sand to achieve efficient effluent cleaning.

Hydrasand - Continuous sand filtration

Operating principle

Raw influent is fed into the base of the sand-filled, cone-bottomed filter. The flow then rises through the sand so that clean effluent is discharged over the upper weir. The rising flow of the effluent is distributed evenly over the entire cross-section of the filter by means of a radial grating system.

The contaminated sand falls continuously to the bottom cone outlet, from where it is transferred by an external airlift to the wash chamber at the top of the unit. Final backwashing of the sand is then performed by a counter-current of clean water before the sand returns to the sand bed in the isolation box. The dirty wash water is discharged over the lower weir for disposal.

Benefits of the Hydrasand continuous sand filter

  • High filtration efficiency
  • External airlift for better accessibility
  • No possible contamination of clean water by returning sand
  • Efficient final sand rinsing in the isolation box
  • Manageable reject stream
  • Minimum maintenance cost
  • Minimum energy requirements
  • No shutdown for backwashing
  • No moving parts
  • No backwash material required

Features of the Hydrasand continuous sand filter

  • Continuous operation and cleaning
  • Superior lift and scouring of sand
  • Adaptability of sand bed depth
  • Flexibility of design
  • Stand-alone unit in stainless steel.
  • Available in concrete version with stainless steel insert, offered to keep transport costs down or for high flow rates.

  

Range

Model Filtration area (m²) Diameter (m) Air consumption (Nm3/hr at bars) Washwater flow
HDS 07     

0.70

0.95

1.5

approx. 5%

HDS 16

1.60

1.45

2

approx. 5%

HDS 30

2.90

1.95

5.5

approx. 5%

HDS 50

5.10

2.55

10

approx. 5%

  

Applications

Environment
  • Tertiary treatment
  • Pre-treatment on membrane filter
  • Phosphorous removal
  • Algae removal
Mining and Minerals
  • Metal finishing

  

Hydrasand Principle

Hydrasand Principle

Hydrasand - Sand filtration

Contact

ANDRITZ SEPARATION

Phone: +33 (1) 39 26 05 50

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Video

Hydrasand – continuous sand filter

Downloads

Hydrasand brochure EN | FR
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