Water reuse for olive groves in Malia and Stalida, Crete
4 June, 2050
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.
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.
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
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.