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Closing the water cycle in horticulture

4 June, 2050

Closing the water cycle in horticulture


Waste water source

The wastewater is a mix of 90 % horticultural wastewater and 10 % municipal wastewater. In periods with high demand and low water input, water from the nearby canal is treated.

Distribution System

There is a storage tank for water that recieved the primary treatment. After the secondary treatment, the reclaimed water is pumped into a closed basin after a disinfection process. If the reclaimed water isn't used immediately, it is pumped in an aquifer storage system. From the aquifer storage system, the water can be pumped up in times of shortage. The water that is pumped up is disinfected first by a UV unit.

Farming system

The reclaimed water is used in the horticultural companies in the area that grow mostly vegetables and ornamentals. They mostly cultivation with hydroponic systems.

Waste water treatment description

Nutrient removal : Constructed aerated reed bed filter (529 m²) and reverse osmosis
Pesticide removal : Constructed aerated reed bed filter
Disinfection : Constructed aerated reed bed filter, reverse osmosis and ultrafiltration
Suspended solids removal : Sand trap, degreaser, multimediafilter and ultrafiltration
Other : The clean water is collected in a basin that is fully closed, to prevent contamination.


The aerated reed bed can treat up to 22 m³/h. Contemplating temperature differences in winter and summer it is estimated that the yearly treated volume is around 100,000 m³. This high capacity is due to the relatively low contamination of the influent wastewater.

Extent of the agricultural beneficiaries

The horticultural companies in the region. The exact numerical data is unknown.


Type of agreement

Scientific results




Type of initiative
Research initiative, Demonstration initiative
Waste water source
Municipal, Agriculture
Waste water treatment
Pesticide removal, Nutrient removal, Desinfection, Suspended solids removal, Other
Farming system
Application use
Irrigation of food crops to be eaten raw, Irrigation of non-food crops
Irrigation method
Drip irrigation
Implementation stage
Full implementation