SEAWATER TREATMENT (DESALINATION) SYSTEMS

Safe and palatable water production from seawater - durable and economical solutions
SEAWATER TREATMENT (DESALINATION) SYSTEMS
Seawater is a more challenging raw water source compared to others: salinity is high, temperature varies seasonally, sand-silt is carried by coastal movements, there are algal periods, and marine life tends to attach to intake lines. Pilsan Construction designs, installs and commissions durable and economical seawater desalination and treatment systems that can safely manage this variability.

WHY IS IT DIFFICULT, HOW IS IT MANAGED?

Salt and Minerals

Seawater contains approximately "tens of grams per liter" of salt. This requires careful design and material selection in pressurized treatment steps.

Coastal Conditions

Waves, currents and post-storm turbidity and sand increase; if the intake structure is not planned according to these conditions, the system is strained.

Biological Growth

Mussels, marine life and biofilm; attachment occurs on intake lines and equipment surfaces.

Seasonal Algal Increases

During periods such as red tide, water color and odor change; pretreatment strategy must be flexible accordingly.

DESIGN STAGES APPLIED BY PİLSAN CONSTRUCTION

1) Safe Water Intake from Sea
  • Site selection and intake velocity: Intake structures designed with slow intake velocities and multi-stage screens that protect fish and plankton

  • Intake type: Pipe intake from open sea from shore, coastal wells (using coastal sand as a natural filter) or evaluation of both together

  • Durable materials: Duplex stainless steels suitable for marine environment, HDPE pipes

  • Limiting biological growth: Protection in intake pipes and intake structures with intermittent and controlled disinfection

2) Smart Pretreatment
  • Multi-stage screening: Coarse-fine screens; wide-surface screens are used against seaweed and jellyfish drift in coastal conditions

  • Chemical adjustment and floc formation: Dose and mixing are automatically adjusted when turbidity changes

  • Sedimentation or flotation: Sedimentation in heavy turbidity; fast and reliable separation with flotation during algal periods

  • Multi-layer filters and cartridge filters: Reduces fine particles, extends RO membrane life

  • Fine-pore pre-filtration (option): Provides additional filtration in difficult seasons, makes water quality very stable

3) Desalination (Two-Stage Reverse Osmosis)
  • Pressurized separation: Salt and minerals are separated by passing water through a very fine membrane. Pressure recovery equipment is used to reduce energy consumption

  • Water yield: With proper design, approximately 40–45 liters of fresh water are obtained from every 100 liters of seawater

  • Protective operation: Automatic rinse-wash, soft start-stop, regular maintenance cycles

  • Scale and salt scaling management: Scale-preventing recipes and dose control according to composition in raw water

4) Final Treatment: Conditioning and Protection
  • Balancing and conditioning: Desalinated water becomes very soft; taste and balance are achieved with appropriate mineral recovery

  • Corrosion control: Alkalinity-hardness balance is established to protect pipes-fittings in network and storage

  • Health safety: Final disinfection by light or chemical methods; precise dosing for desired persistence in network

5) Concentrated Brine Management
  • Environmental compliance: Concentrated brine at the outlet is safely discharged to sea with diffuser heads that accelerate mixing

  • Site-specific solution: Coastal currents, depth and environmental impacts are evaluated together; dilution is done with other lines if necessary

WE MAKE A DIFFERENCE IN FINE DETAILS

Algal season protocol: Taste-odor and color control with flotation-filtration combination and activated carbon support.

Filter clogging tendency tracking: Not just a number, but the speed of the trend is also monitored; cleaning cycles are planned accordingly.

Chemical balance: Fine adjustment of scale-preventing chemicals according to season and water temperature.

Quiet and safe operation: Acoustic and vibration criteria in fan-pump selection; environmentally sensitive operation during night operations.

Redundancy: Redundant architecture for "system not stopping during maintenance" in pumps and critical equipment.

Remote monitoring: Turbidity, conductivity, pressure, temperature and flow are continuously monitored; early warning before deviations occur.

CAPACITY AND INSTALLATION OPTIONS

Fixed Facilities

High-capacity, multi-barrier architecture for cities and industry.

Container-Type Solutions

Packaged systems quickly commissioned for islands, construction sites, tourism facilities and emergencies.

Modular Growth

Capacity is increased by adding new modules as needed.

SERVICES OFFERED BY PİLSAN CONSTRUCTION

  • Site survey and seawater intake projects (current-depth-storm analysis)

  • Sampling program and seasonal characterization (turbidity, conductivity, temperature, taste-odor)

  • Pilot trials and preliminary report, detailed process design and 3D layout

  • Manufacturing-installation, commissioning, operator training

  • Operating support, consumables and spare parts, remote monitoring and performance tracking

CONCLUSION
Producing safe and palatable water from seawater requires mastery of details. Pilsan Construction carefully designs every step from the right intake structure to algal season protocols, from pressure recovery to conditioning. Result: stable quality, low operating load and a long-lasting facility.