Kosad, Surat
Hybrid UASB + MBBR with WtE
Lump Sum Turnkey (LSTK)
84 MLD (+ 0.6 MWe)
The Kosad facility is a benchmark in sustainable municipal engineering, processing 84 MLD of sewage while simultaneously generating 0.6 MWe of green electricity. By integrating biological wastewater treatment with biogas harvesting, the plant significantly offsets its own carbon footprint and operational energy costs, serving as a flagship utility for the Surat Municipal Corporation.
The primary goal was to implement a “Waste-to-Wealth” model. This involved creating a high-efficiency treatment line that meets stringent discharge standards for the Tapi River basin while capturing methane—a potent greenhouse gas—to fuel an on-site power generation unit for optimized self-sufficiency.
The core challenge lay in the seamless integration of anaerobic (UASB) and aerobic (MBBR) processes. Balancing the hydraulic retention time for biogas production while ensuring the aerobic stage achieves rapid nitrogen and BOD removal requires precision automation and sophisticated flow control to prevent process interference.
Enviro implemented a dual-stage biological solution. The UASB reactors act as the primary energy harvest zone, breaking down organic matter in an oxygen-free environment to produce methane. The secondary MBBR stage utilizes specialized biofilm carriers to provide high surface area for bacterial growth, ensuring final effluent polishing. This is coupled with a 0.6 MWe Biogas Power Plant, converting captured gas into electricity via high-efficiency combustion engines.
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