Pirana, Ahmedabad
CASP & DAS (Diffused Aeration)
Turnkey EPC
180 MLD
The Pirana Sewage Treatment Plant (STP) represents a significant milestone in Ahmedabad’s environmental infrastructure. Engineered to handle a massive hydraulic capacity of 180 MLD, the facility serves as a primary treatment hub for the Ahmedabad Municipal Corporation.
The project involved the comprehensive design and commissioning of massive civil structures and electro-mechanical systems capable of managing the high-volume domestic sewage generated by the city’s expanding southern and central zones.
The primary objective was to modernize the city’s sewage disposal system to prevent the discharge of untreated effluent into the Sabarmati River. By implementing a high-capacity biological treatment line, the project aimed to achieve stringent BOD (Biochemical Oxygen Demand) and TSS (Total Suspended Solids) reduction.
The strategic goal was to create a sustainable, high-throughput facility that could scale with the city’s urban density while maintaining absolute adherence to national discharge mandates.
One of the principal challenges was engineering a system robust enough to handle the extreme diurnal flow variations typical of large Indian municipalities. The design had to account for high concentrations of organic matter and grit, which are common in combined sewage systems.
Furthermore, implementing such a large-scale project required precise site management and the integration of heavy-duty mechanical hardware that could operate 24/7 without risking process instability or structural fatigue.
The solution centered on the Conventional Activated Sludge Process (CASP), a time-tested biological treatment method optimized for large-scale municipal applications.
To enhance efficiency, a Diffused Aeration System (DAS) was integrated into the aeration basins. Unlike traditional surface aerators, the DAS utilizes a network of fine-bubble diffusers to maximize oxygen transfer efficiency.
This technology ensures uniform dissolved oxygen (DO) levels throughout the tanks, promoting superior microbial activity, reducing sludge volume, and significantly lowering the overall energy footprint of the 180 MLD operation.
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