The INVENT Sequencing Batch Reactor with Granular Sludge
iSBR®/iGSR®-System
Decades of experience in Sequencing Batch Recators led to the development of the INVENT iSBR®/iGSR®-System, which incorporates the advanced proprietary iC³-Process.
The design is optimized:
- Cascaded reactor design
- Cyclic process
- Influent can be Continuous
The process using the INVENT Key Equipment Package brings together simplicity and sophistication to maximize performance, stability and flexibility while minimizing maintenance and operational costs.
Designed with Operation in Mind
Developing all products in-house allowed the team to design the system precisely for the unique needs of the customer. The INVENT iSBR®/iGSR®-System components work together seamlessly to deliver the best performance throughout the entire process cycle.
HYPERCLASSIC®-Mixing and Aeration System
The HYPERCLASSIC®-Mixing and Aeration System provides energy efficient mixing during the anaerobic and anoxic phases and efficient oxygen transfer during the oxic phases. It is a mechanical aeration system, completely non-clogging with consistent long-term performance. The cascaded reactor is created by leveraging the unique virtual wall effect of INVENT’s hyperboloid technology. With the unmatched ability to decouple mixing from aeration, the speed can be controlled to accommodate varying influent flow while ensuring the growth of granular sludge.
iTURBO®-Blower
iTURBO®-Blowers are highly efficient, quiet, and are suitable for varying air requirements and plant capacities. Its compact design allows installation in small footprints. It features a high-speed permanent magnet motor, a two-pass pressurized cooling system, an air cushion bearing and an integrated air flow measurement for optimal aeration process control.
iDEC®-SBR Decanting System
The iDEC®-SBR Decanting System is fluid mechanically optimized for decanting large volumes of water without disturbing the sludge blanket in the decant phase of the cycle, ensuring consistent clear water draw-off. iDEC®-SBR Decanting System maximizes output performance by operating based on hydraulic pressure differences. The tapered collector and downpipe is designed for minimum system pressure loss. The decanting system incorporates a heavy duty swivel joint and an intelligent automatic winch control to ensure easy long-term operation and integration in the plant’s SCADA.
Engineering Package and CFD
INVENT executes project-specific, optimized iSBR®/iGSR® process design, based on dynamic simulations using BIOWIN or SUMO providing mass balances and process flow diagrams.Engineering can be refined by computational fluid mechanics (CFD) simulations to analyze and optimize reactor behavior and inflow distribution for new and existing structures.
The Engineering package includes civil outline drawings, fluid mechanically optimized reactors and piping systems, and detailed P&IDs with general layouts, pipe size calculations and instrumentation and control sensors.
iFILT DYNAMIX®-Disk Filter
The iFILT DYNAMIX®-Disk Filter is offered when additional effluent filtration is necessary for meeting discharge requirements or specific water reclamation standards. The iFILT DYNAMIX®-Disk Filter is a highly performing and efficient stainless steel disc filter in a compact footprint. It provides excellent tertiary effluent quality and increased throughput with low reject flow from the integrated backwash system, and superior durability due to the all stainless steel design. The use of 316 stainless steel mesh provides longer life cycle performance compared to other filter fabrics.
iGSR® Reactor Design
The unique iSBR®/iGSR®-Process design allows maximum mass transfer, optimal reactor behavior small overall footprint, and elevated operational reliability and performance. The most modern fluid mechanical simulation tools and dynamic simulation is used to enhance the overall process performance and specific load conditions.
Aerobic granular sludge production under batch and continuous flow conditions in the iGSR® is achieved using a cascade of completely mixed tank reactors. These reactors are created with several HYPERCLASSIC®-Mixing and Aeration Systems in series, creating unique process zones within each reactor and operating in sequential cyclic process phases.
1. Fill/Mix
The HYPERCLASSIC®-Mixing and Aeration System operates at a reduced speed, and provides mixing without aeration. The first two zones remain anaerobic, while zones 3–4 remain mostly anoxic for partial organic degradation and phosphorus removal. The system efficiently feeds the incoming flow into the sludge blanket, providing a high F:M ratio, selecting for specific microbiology.
2. Fill/Mix/Aerate
During the aeration cycle, filling continues while the system operates at a higher speed for strong mixing and aeration – efficiently supplying oxygen for BOD/COD removal and nitrification. Mechanical mixing prevents foaming, supports granular sludge growth and ensures high oxygen transfer (High Alpha-value in wastewater).
3. Fill/Degas
After the fill/mix/aerate step is complete, the HYPERCLASSIC®-Mixing and Aeration System increases speed and mixing intensity for effective sludge degassing. This improves settling properties of the sludge and prevents foam buildup.
4. Fill/Settle/Slow Mix 1
While the solids settle, anoxic conditions support denitrification. Low-speed mixing distributes incoming wastewater into the sludge blanket releasing biological phosphorus under anaerobic conditions . These conditions at the inlet of the reactor promote conversion of bCOD1 to rbCOD2, which support granular sludge growth and boost denitrification when mixing resumes after settling and decanting.
1 biodegradable chemical oxygen demand | 2 readily biodegradable chemical oxygen demand
5. Fill/Decant/Slow Mix 2
In the final step, low-speed mixing and wastewater inflow continue to create anaerobic conditions for Bio-P uptake. The iDEC®-Decanting System gently allows treated effluent to be discharged without disturbing the sludge blanket. Meanwhile excess sludge is removed to maintain the required MLSS concentration for the process design. After decanting, the decanter rises to its idle position and the cycle restarts.
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Why the INVENT iSBR®/iGSR® ?
Efficient
Superior energy efficiency
Inflow distribution, homogenization, and oxygen transfer are efficiently achieved with HYPERCLASSIC®-Mixing and Aeration Systems. Compared to membrane systems, they deliver superior and consistent mixing and aeration performance under real process conditions, with high alpha-values and absolutely no fouling or efficiency loss over time.
Stable
High process stability
The advanced reactor design provides conditions for enhanced nutrient removal, selective microbial growth and ideal reactor behavior. The system has substantial operational stability while having the ability to accommodate flow and load fluctuations. The process is easy to control and operate.
Reliable
Excellent effluent quality
INVENT has the perfect equipment for creating granular sludge conditions. It provides densified sludge with low SVI for fast and reliable settling. The combination of granular and densified sludge incorporates the benefits of both for reliable and excellent effluent quality with very low turbidity. Its modular design provides the highest adaptability and system redundancy.
Compact
Continuous or batch flow operation
The iSBR®/iGSR®-System uniquely utilizes advantages of batch operation with the ability to incorporate conventional continuous flow, eliminating the need for large EQ-basins and reducing overall plant footprint. It is designed in modules, each consisting of several HYPERCLASSIC®-Mixing and Aeration Systems in series providing the cascaded reactor design, ending with the iDEC®-SBR Decanting System. This allows several process steps in one reactor. The selected size and number of modules depends on each plant’s individual capacity, treatment requirements and site conditions.
Advanced
Granular sludge capability
INVENT’s process and reactor design combined with the unique INVENT equipment package enables reliable granular sludge growth under either batch or continuous flow conditions through a cascade of completely mixed tank reactors and cyclic process phases – the iC³-Process.
Robust
Unique equipment package
The process and equipment is completely developed in-house at INVENT, meaning each product is optimally designed for seamless interaction in the cyclic process. The robust and proven HYPERCLASSIC®-Mixing and Aeration System is the core of the package, allowing decoupled mixing and aeration, and consistent operation with minimal maintenance.
Introducing the iSBR®/iGSR®-Technology
Applications of the iSBR®/iGSR®-System
Municipal Wastewater Treatment
- Applicable to all sizes, ranging from compact and large-scale plants
- Modular design for easy integration and operation
- Excellent effluent quality and stable process performance under variable treatment conditions
Industrial Wastewater Treatment
- Robust, low-maintenance equipment for long-term, trouble-free operation with consistent efficiency
- Adaptive process design for special requirements, wastewater contents and load fluctuations
- Extensive experience in industrial wastewater treatment (Pulp & Paper, Oil & Gas, Food & Beverage, Tanneries)
Plant upgrades
- Versatile project-specific design and integration enabling increased treatment capacity within existing basins
- Higher flows (OR Increased hydraulic capacity) and improved effluent quality through implementation of the iSBR®/iGSR® process
- Easy (retrofit) installation without civil modifications
- Operation-friendly control system for straightforward operation and fast response to fluctuating treatment conditions
