Alanya - Turkey

MEASUREMENTS AND VERIFICATION

The plant laboratory was given responsibility of the analytical measurement of waste water and sludge quality during every phase of the treatment.

CENTRALIZED CONTROL

A command-control system that is based on automated operations is linked to a central command post and provides complete 24-hour control of the treatment facility.

Each phase of the treatment is thus remotely controlled and optimized.

PRETREATMENT

Screening

The waste water passes through bar-screens which capture the solid wastes larger than 10mm in size to protect the following stages of the treatment.

Grit and grease removal

The influent then flows into the grit and grease removal tanks.
Settled grit is scraped and removed by pumping from the grit hoppers. Subsequently, grit separated from waste water into a classifier is discharged.
Simultaneously, in the same tanks, air is injected to emulsify the grease and oil which floats to the surface, where it is skimmed off. After concentration in a separate tank, grease is discharged to the dumping area.

BIOLOGICAL TREATMENT

Activated sludge aeration tank

The physically pretreated influent is then diverted to a high-loaded plug-flow activated sludge aeration tank where a high portion of the organic material (BOD) is removed.
Also the dosing of ferric chloride in the last phase of plug-flow reactor provokes the formation and subsequently precipitation of ferric phosphates in the following sedimentation units, resulting in chemical phosphorus removal from the waste water.

Lamellar settling process

The flow is directed to lamella type sedimentation tanks.
Sludge settles on the inclined lamella surfaces and slides to the bottom, while the supernatant is collected into the weir troughs on the top and let into the next treatment unit.
The lamella configuration offers significant space-saving features ; it requires about eight times less space than the conventional settlers.

Biofiltration

by Biostyr^TM process

After settling, the supernatant is treated through 6 Biostyr^TM filters.
The Biostyr^TM process, developed by Veolia Water Solutions & Technologies, is an upflow submerged biofilter bed and utilizes an ascending filtration system using granular media made up of expanded polystyrene spherical beads.
These beads provide a medium to which microorganisms can attach and thrive, hence enabling the elimination of organic matter and Kjeldahl nitrogen pollutants through microbiological activities.
Additionally, the polystyrene beads allow the treated effluent to flow freely while retaining suspended solids and ensuing biological sludge.
The retained suspended solids, sludge and biofilms on beads are removed by periodical backwash, which involves alternating water-phase/airscour phase and wash cycles.
Backwash water is directed to a special sedimentation tank

DISINFECTION

Treated water is finally subjected to chlorination for disinfection before discharging into the Mediterranean sea in order to prevent any nuisance condition for the swimmers and for the other recreational uses.