AquaReUse concept 

AquaReUse facility connects to the existing sewer infrastructure in the area. The water treatment follows a tiered approach that takes place in the following six units 

1. Waste water collection unit. The waste water supply can fluctuate throughout the season. If the supply is insufficient, surface         water can be used and treated. In total, around 193 thousand m3 of water per year is collected and pumped through this                 purification system.
2. Solid compounds separation unit. First step in water purification is to remove all the bulk and heavy solid compounds in a               separation unit.
3. Water buffer unit. The waste water is buffered in a large basement (830 m3) where the rest of the solid compounds are                   precipitated and removed.
4. Biological filter unit. The water is filtered through a biological filter bed (529 m2) in a biological treatment process that uses           living plants called helophytes.
5. Oxidation unit. Oxidation is used for the treatment of organic compounds dissolved in the waste water including pathogens.
6. Fine filtration unit. Separation of contaminants and unwanted salts with a very fine filtration: Reverse Osmosis.
The purified fresh water, on average approximately 123,000 m3 per year, is made available via a distribution system to                     horticulture enterprises (maximum flow rate of 52 m3/h). In case the purified water cannot be delivered directly, the surplus is       injected into the ground to be used as a reserve. 

Disinfection takes place according to a tailor-made approach, whereby the microbiological safety of the irrigation water is equivalent to the water, which is collected on a clean surface and stored in a precipitation water basin.

The requirements, which are imposed on the quality of the purified irrigation water are as follows:

  • Electric Conductivity not higher than 0.2 mS / cm
  • pH between 5.0 and 7.0
  • Turbidity less than 2 FTE
  • The water cannot contain viruses, bacteria or fungi on levels of which it is known that they can be harmful to the horticultures. 
  • Finally, the irrigation water must not exceed specific concentration levels for pesticides or herbicides components.

For more information on AquaReUse please contact Aad Wubben or Rogier Sterk.                                                                                
Tel. +31 174 – 625246 or visit our website: (Dutch)