Project Overview
The 200 MLD Sewage Treatment Plant at Bhesan, Surat represents a major step forward in municipal wastewater management. Originally a 100 MLD conventional activated sludge process (CASP) facility, Enviro upgraded and expanded the plant to 200 MLD capacity, integrating advanced treatment processes and renewable energy generation.
The upgraded plant incorporates:
- Integrated Fixed Film Activated Sludge (IFAS) technology, boosting biological treatment efficiency by combining suspended and attached growth systems.
- Advanced Oxidation Ditch with Biological Nutrient Removal (BNR), ensuring stable operation and enhanced removal of organic matter and nutrients.
- A 300 kWe biogas-based power generation system, supplying renewable energy for plant operations and reducing reliance on the grid.
This dual focus on capacity expansion and energy efficiency makes the Bhesan STP a model of sustainable urban wastewater treatment.
Project Objectives
- Upgrade an existing 100 MLD CASP-based STP to meet growing demand and stricter norms.
- Expand total capacity to 200 MLD.
- Introduce IFAS and oxidation ditch technologies for efficient BNR and stable operation.
- Generate renewable energy through biogas-based power systems to lower OPEX.
The Challenge
- Retrofitting advanced processes into an existing facility while maintaining continuous operations.
- Meeting increasingly stringent discharge standards for nutrient removal.
- Reducing the plant’s operational energy footprint.
The Solution
Enviro implemented a comprehensive upgrade and expansion strategy:
- Converted the original 100 MLD CASP system into an IFAS-based treatment line.
- Added a new 100 MLD oxidation ditch with advanced BNR capabilities.
- Integrated 300 kWe biogas power generation, producing renewable energy from sludge digestion.
- Deployed modern process automation for reliable, efficient operation.
The Results
- Doubled plant capacity to 200 MLD, serving more residents and industries.
- Significant improvement in effluent quality, aligned with CPCB and NGT standards.
- 300 kWe renewable power generated from biogas, offsetting energy use and reducing costs.
- A sustainable, future-ready facility demonstrating Enviro’s expertise in upgradation and energy integration.
Why It Matters
The Bhesan project showcases how existing plants can be transformed into high-capacity, energy-efficient facilities. By combining IFAS, oxidation ditch BNR, and biogas power generation, Enviro set a benchmark for urban sewage treatment retrofits in India.
