24–7 Management of the Wastewater from 16 million Inhabitants on Two Continents.

The Istanbul Water and Sewerage Administration (ISKI) has commissioned WABAG specialists to manage wastewater for the entire Asian and European districts of the city, which has a population of approximately 16 million people.

This project ensures the professional 24/7 management of the wastewater of the entire City. WABAG was responsible for maintaining and operating the integrated wastewater infrastructure, which includes pre-treatment facilities, mechanical/biological WWTPs and pumping stations, ensuring the reliable and efficient treatment of wastewater in the city of Istanbul.

Project Features:

• Scope:
  • Maintaining a network of 124 units on two continents:
  • 9 pre-treatment plants with a capacity of  4,200,000 m³/day,
  • 51 biological wastewater treatment plants with a capacity of 880,000 m³/day,
  • 64 pumping stations managing 2,300,000 m³/day.
  • The contract focuses on energy-optimized designs and reliable treatment processes to manage the city’s vast and complex wastewater network.

• Treatment Process:
  • The management model involves both mechanical and biological processes across multiple facilities. Three main wastewater treatment plants handle the bulk of the city’s wastewater volume, emphasizing energy-efficient designs through Anaerobic Sludge Treatment and Biogas Utilization, and operational excellence: 
  • Tuzla WWTP: 250,000 m3/d, Co-Generation 2 x 4,600 kW
  • Pasaköy WWTP: 200,000 m3/d, Co-generation: 4,600 kW
  • Ataköy WWTP: 400,000 m3/d, Co-generation: 9,200 kW
• Impact: This project contributes significantly to the protection of the local environment, ensuring the safe discharge of treated wastewater. With continuous and reliable wastewater management, Istanbul’s citizens benefit from improved sanitation and a cleaner ecosystem, while the system’s energy efficiency reduces overall operational costs and environmental footprint.

WABAG not only provided plant operation but also improvements in plant performance and plant efficiency, consulting for re-investments (rehabilitation, upgrade, new investments) and the realisation of the projects as well as development through R&D projects.