ASTRASAND®

ASTRASAND® is a continuous sand filter, in which the filter bed is continuously cleaned during the filtration operation. It can be applied for different purposes: for physical-chemical treatment (solids removal) and/or biological treatment (phosphate and nitrogen removal).

ASTRASAND® is already applied in more than 350 projects worldwide, on different types of water, such as process, waste, surface, cooling and ground water.

Applications of continuous filtration by ASTRASAND®

  • Biological nitrification/denitrification
  • Polishing of municipal and industrial wastewater
  • Re-use of water in combination with membrane filtration and disinfection
  • Direct filtration of surface water with in-line flocculation
  • (Biological) side stream filtration of cooling water
Typical influent and effluent characteristics
Characteristic Influent Effluent
Biological denitrification (in mg NOx-N/l) 10 - 50 0 - 5
  5 - 10 0 - 1
Phosphate removal (in PO4-P/l) 5 - 10 1 - 2
  1 - 2 0.1 - 0.2
Suspended solids (in mg TSS/l) 40 - 200 10 - 50
  10 - 40 1 - 10
Biological nitrification (in mg NH4+-N/l) 5 - 30 0.2 - 2

Advantages of ASTRASAND®

  • Robust, continuous, self-cleansing system
  • Capable of coping with fluctuations
  • Suitable for physical-chemical as well as biological treatment (or a combination)
  • No moving parts, thus high up-time and low maintenance
  • Compact installation with small footprint
  • Constant effluent output
  • Low operational costs
  • Modular design
  • Proven over 20 years

ASTRASAND® cases