Activated Sludge Process (ASP) is a proven and widely adopted aerobic biological wastewater treatment technology used for effective removal of organic pollutants from wastewater.
In this process, wastewater is mixed with biologically active sludge in an aeration tank, where microorganisms metabolize organic matter in the presence of oxygen.
The treated mixed liquor then flows to a secondary clarifier, where biomass settles under gravity and clarified treated water is separated. A controlled portion of settled sludge is recycled back to the aeration tank to maintain the required microbial concentration, while excess sludge is withdrawn for further thickening and dewatering.
ASP is suitable for applications requiring reliable BOD and COD removal, provided that hydraulic loading, organic load variation and operational parameters are properly controlled through sound engineering design.
Process Working Principle
Wastewater enters the aeration tank where oxygen is supplied through diffused or mechanical aeration systems.
Microorganisms utilize organic pollutants as a food source, converting them into biomass, carbon dioxide and water.
Proper sludge recycling maintains process stability and consistent treatment efficiency.
How S N Group of Environment Delivers ASP Systems
At S N Group of Environment, ASP systems are engineered beyond textbook design values, with a strong focus on long-term operational stability, energy efficiency and regulatory compliance.
Each system is designed based on actual influent characteristics and site-specific operating conditions.
Engineering Strengths of Our ASP Design
Accurate F/M ratio and MLSS calculation using real influent flow and organic load data
Aeration system design optimized for oxygen transfer efficiency and energy savings
Selection of appropriate diffuser or aerator type based on tank geometry and process demand
Secondary clarifier sizing and hydraulic design to prevent sludge bulking and solids carry-over
Sludge return and wasting logic aligned with process stability and treated water reuse objectives
Provision for load fluctuation handling and future capacity enhancement
Performance & Compliance Focus
Our ASP plants are designed to deliver stable and consistent effluent quality with simplified operation and control.
Each system is engineered to meet CPCB / SPCB discharge and reuse norms, ensuring inspection readiness and long-term regulatory compliance.
Key Advantages of ASP Technology
Proven and reliable biological treatment process
Effective BOD and COD removal efficiency
Flexible design suitable for a wide range of applications
Ease of operation with proper process control
Compatibility with tertiary treatment and reuse systems
Long-term stable performance with proper engineering design