Integral Clarifier Sequencing Reactor (ICSR)

AIS can be configured as ICSR in the form of multi-stage system for biological carbon, nitrogen and phosphorus removal, a fitting continuous flow replacement to Sequencing Batch Reactors.


The Integrated Continuous Sequencing Reactor (ICSR) represents a significant configuration difference from the traditional AIS setup. Drawing from the success of the anoxic-aerobic single-tank configuration in large-scale nitrogen removal projects, the ICSR integrates the best elements of both the Extended Aeration Activated Sludge Process (EAASP) and the Sequencing Batch Reactor (SBR). Unlike the SBR, the ICSR operates as a continuous flow system with continuous feed and overflow and is not dependent on any automation like the SBR is. Additionally, a separate clarifier within the basin does away with solids and foam carryovers. Compared to conventional EAASP, the ICSR requires less retention time, has better clarifier performance and has lower power consumption, all without any moving parts within. 

Taking inspiration from the feast-and-famine sequencing principle of SBRs, the single-tank ICSR is compartmentalized into zones that replicate the Fill, React, and Clarification sequences of an SBR. This approach optimizes the treatment process, enhancing nutrient removal and overall performance. 

One of the key innovations of the ICSR lies in its patented biomass conditioning and induced sludge velocity concept. This enables the ICSR to operate at higher Mixed Liquor Volatile Suspended Solids (MLVSS) concentrations compared to conventional ASPs or SBRs. Consequently, smaller aeration volumes are required, leading to more efficient use of resources. 

Moreover, the ICSR boasts a maintenance-friendly design, devoid of any moving parts such as scrappers, gears, submersible pumps, or drives. This translates to minimal maintenance requirements and lower operating costs over the system’s lifespan. Unlike SBRs, which heavily rely on automation, the ICSR can accommodate variations in feed quality and quantity without the need for special adjustments or interventions. This flexibility enhances its suitability for a wide range of wastewater treatment applications. 

The successful completion of a 100 MLD CETP and a 12 MLD ZLD based on the ICSR technology underscores its efficacy. These milestones testify to the ICSR’s potential to revolutionize wastewater treatment processes, offering a sustainable and cost-effective solution for addressing environmental challenges.

Project Highlight

Industry: Textile

Flow: 100000 m 3 /d
Incoming BOD: 650 mg/L
Design MLSS: 4500 mg/L