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Water reuse for olive groves in Malia and Stalida, Crete

4 June, 2050

Water reuse for olive groves in Malia and Stalida, Crete

Waste water source

The treatment plant is in operation since 2008. The treatment plant receives the municipal sewage of the city of Malia, and Stalida coming from households and urban use.

Distribution System

There is a storage tank  where tertiary and disinfected irrigation water is stored. The pipeline irrigation system is of short length (approximatively 500 meters) since the irrigation areas are next to wastewater treatment plants.

Farming system

The final effluent is foreseen for the irrigation of olive trees, as well as greenery and ornamental plants.  All areas use drip irrigation, there is no extensive irrigation, and it is mostly seasonal.

Waste water treatment description

Nutrient removal : Activated sludge treatment system, nitrification denitrification, phosphorus removal
Pesticide removal : none
Disinfection : UV and chlorination in effluent disposal treatment tank
Suspended solids removal : Aeration, secondary sedimentation
Other :


The  treatment plant will expand to serve 20,000 population equivalents  in summer 2020 and 30,000 population equivalents in  summer 2040.

Extent of the agricultural beneficiaries

The total irrigation area  is 1,005 hectares.


The cost of reclaimed water is estimated to be less than 0.3 euro/m3.

Type of agreement

The Wastewater Treatment Plant owner is the Water and Sewer Municipal Company of Hersonissos. The plant is operated by a concessionaire company which has the responsibility of:

  • the operation, maintenance of installations and infrastructure,
  • the maintenance and transfer of dehydrated sludge,
  • daily, weekly and monthly follow-up reports,
  • the 24-hour monitoring of the operation,
  • the observance of safety and health measures,
  • and the laboratory analyses

The owner has the responsibility of reclaimed water distribution works.

Scientific results




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