What It Does

GreenSTP Sewage Treatment Plants harness Sequencing Batch Reactor SBR) technology, a versatile fill-and-draw activated sludge process that treats wastewater in timed batches within a single reactor tank, eliminating the need for multiple basins and continuous flow systems. The process unfolds in five sequential phases: Fill, React, Settle, Decant, and Idle. During the Fill phase, raw sewage enters the tank, mixing with activated sludge while initial anaerobic or anoxic conditions promote denitrification. In the React phase, aeration introduces oxygen, enabling aerobic microorganisms to degrade organic matter, reduce BOD and COD, and facilitate nitrification for nitrogen removal. The Settle phase allows solids to separate by gravity, forming a clear supernatant. Decant then withdraws the treated effluent from the top, while the Idle phase prepares the system for the next cycle, including sludge wasting to maintain optimal biomass levels.

This batch operation provides precise control over biological processes, adapting to variable influent flows and loads without separate clarifiers. GreenSTP SBR systems incorporate automated controls for phase timing, aeration intensity, and sludge management, ensuring resilience to shock loads, temperature fluctuations, and toxic inflows. The result is high-quality effluent with BOD 10 mg/L, TSS 5 mg/L, and effective nutrient removal (up to 90% for nitrogen and phosphorus), suitable for discharge or reuse. Modular designs support capacities from 10 KLD to 10 MLD, with easy retrofitting and expansion. By combining all treatment steps in one tank, GreenSTP minimizes footprint, sludge production, and energy use, promoting cost- effective compliance with stringent standards like CPCB norms while advancing circular water economies in urban and industrial settings.