As part of IOCL’s 15 MMTPA grassroots refinery at Paradip, WABAG executed a state-of-the-art effluent treatment and water recycling plant to promote environmental protection and water sustainability.

The plant treats a wide range of effluents from refinery operations, including chemically complex streams such as spent caustics and landfill leachates. It features a multi-barrier treatment system with advanced technologies, achieving 85% water recovery and reducing freshwater dependency by over 17,000 ML annually. This project supports IOCL’s green commitment by ensuring secure water reuse and discharge standards aligned with international norms.

Project Highlights:

• Scope: EPC – turnkey execution of effluent treatment, water recycling, and sludge management systems.
• Treatment Process:
  • Effluent Treatment: API, TPI, DAF, biotower, aeration tanks, secondary clarification, VOC treatment, and wet air oxidation for spent caustics.
  • Water Recycling: Ultrafiltration and reverse osmosis with hard COD management of RO reject using powdered activated carbon.
  • Sludge Treatment: Thickening and dewatering via centrifuges; sludge weathering beds for biosludge management.

• Impact:
  • Enables reuse of high-quality water for boiler make-up at the refinery.
  • Saves over 17,000 ML of freshwater annually.
  • Complies with stringent discharge standards, improving ecological outcomes in the coastal region.
  • Demonstrates green performance in treating challenging effluents under demanding industrial conditions.