Project Overview
The Pirana Sewage Treatment Plant in Ahmedabad is a pioneering project in large-scale wastewater management. Commissioned by the Ahmedabad Municipal Corporation, it is India’s first and largest sewage treatment facility based on the Conventional Activated Sludge Process (CASP) with fine bubble diffused aeration.
With a treatment capacity of 180 million liters per day (MLD), the plant significantly improves the quality of treated effluent while reducing pollution in nearby water bodies. The integration of a fully automated Programmable Logic Controller (PLC) and Supervisory Control and Data Acquisition (SCADA) system allows for real-time monitoring, process optimisation, and efficient plant management.
Key Facts
- Client: Ahmedabad Municipal Corporation
- Capacity: 180 MLD
- Contract Type: EPC with O&M
- Technology: CASP with fine bubble diffused aeration, PLC + SCADA automation
- Location: Pirana, Ahmedabad, India
Project Objectives
- Reduce pollution levels in local rivers and water bodies.
- Achieve effluent quality with treated sewage parameters of TSS/BOD ≤ 30/20 mg/L.
- Introduce advanced automation to enable reliable, efficient, and scalable plant operation.
The Challenge
- Designing and delivering one of the largest sewage treatment plants of its time in India.
- Ensuring compliance with new environmental norms while processing large wastewater volumes.
- Implementing advanced automation systems for continuous process control and monitoring.
The Solution
Enviro applied CASP technology integrated with fine bubble diffused aeration to optimise biological treatment. Automated PLC and SCADA systems provided full control of plant operations, improving energy efficiency and ensuring compliance with discharge standards.
The Results
- First-of-its-kind 180 MLD CASP-based STP in India with advanced diffused aeration.
- Treated effluent consistently meeting TSS/BOD ≤ 30/20 mg/L.
- Real-time monitoring and automated controls ensuring operational reliability.
- Substantial reduction in river pollution, improving local water quality.
Why It Matters
The Pirana STP is a landmark in India’s wastewater treatment history, showcasing how large-scale conventional processes can be modernised with automation and advanced aeration to deliver compliance, reliability, and sustainability.
