WABAG was awarded a contract for the Pappankalan municipal wastewater treatment plant based on a Design-Build-Operate (DBO) scheme by the Delhi Jal Board in 2012. This environmentally-friendly wastewater treatment facility has a capacity of 91,000 m³/d and incorporates mechanical and biological treatment processes based on the activated sludge method. Following these treatments, the plant utilizes anaerobic sludge digestion for biogas production, which is then used for energy generation. WABAG realized the project on a turnkey basis, including all civil works. After commissioning in 2000, WABAG assumed responsibility for the operation and maintenance of the plant for eleven years.

Project Highlights:

• Scope: DBO
  • Turnkey execution: Design, Engineering, Supply of electromechanical equipment, Construction, Installation, Start-up and Commissioning, 11 years Operation & Maintenance period.

• Main Technology: Activated sludge, anaerobic sludge digestion & biogas utilization.

• Main Process Steps:
  • Mechanical Treatment: Screening, aerated grit chambers, primary settling
  • Biological Treatment: Biological nutrient removal including phosphorus
  • Tertiary Treatment: Dual Media Filtration, Desinfection.
  • Sludge Treatment
    • Thickening
    • Anaerobic Digestion (4 x 2,288 m3 digesters)
    • 2.8 MW Cogeneration Plant for Biogas Utilisation
    • Gas tanks (2 x 1,200 m3)
    • Dewatering by belt filter press
    • Dewatered sludge is composted to create organic manure.
• Impact: The Pappankalan WWTP contributes significantly to environmentally-friendly wastewater disposal in New Delhi. By utilizing advanced treatment processes and energy recovery systems, the plant reduces the pollution load in local water bodies while harnessing biogas to power its operations. The composting of dewatered sludge further enhances its environmental benefits by producing organic manure.