Digester Mixing System
Mixing System for Anaerobic Digesters
Maximum Reliability. Zero Digester Downtime. Landia GasMix delivers a highly reliable mixing solution for anaerobic digesters, designed to keep the digester in operation at all times.
During operation, sludge is drawn from the bottom of the digester into the GasMix chopper pump, where solids are reduced before being returned to the tank.
All equipment is externally mounted, meaning there are no rotating parts inside the digester.The complete system, including pumps and nozzles, is installed outside the tank.
This:
This eliminates the need to open the digester for inspection, service or repair of the mixing system.
•
Improves digestion efficiency
•
Prevents clogging of pipes and nozzles
•
Ensures stable, predictable operation
For the operator, this means:
Mixing is carried out in multiple zones to ensure complete and stable conditions throughout the digester.
•
Continuous operation with no digester downtime
•
•
No loss of gas production due to maintenance
Upper-zone injection entrains biogas, supporting gas release and biological activity
•
Full service access without process interruption
Lower-zone injection delivers powerful bulk mixing
•
Optional top injection prevents surface crust formation
• •
Improved safety with no confined space entry
•
Low and predictable maintenance costs
Digester Mixing System
Efficient digestion, reliable plant performance, and long-term reliability of the digester.
2
Landia GasMix
www.landiainc.com
Landia GasMix
www.landiainc.com
3
Digester Mixing System
How it works? Stage 3:
The mixing process is carried out in stages from the bottom up:
Upper Mixing Nozzle Crust Breaker
In the first stage, sludge is injected into the lower part of the tank, creating powerful bulk mixing and preventing sedimentation.
In the second stage, sludge is injected into the upper part of the digester, where biogas is entrained and mixed into the flow, supporting gas release and process stability.
Stage 2: Landia Gas Ejector Nozzle
Depending on digester type and size, a third stage can be included, where sludge is injected into the top zone to prevent surface crust formation.
Stage 1:
Recirculation through the upper and lower nozzles creates rotational flow throughout the digester, ensuring complete mixing.
Lower Mixing Nozzle
A key component of the GasMix system is the chopper pump. The Landia Chopper Pump is the heart of the GasMix system. It provides powerful, consistent flow to the nozzles while reducing solids into smaller particles, supporting a reliable and efficient biogas process.
Chopper Pump
4
Landia GasMix
www.landiainc.com
• Upper Mixing Nozzle
• GasMix Nozzle The uniqueness of the Landia GasMix system lies in the design of the GasMix nozzle, developed over many years to achieve highly efficient performance. When sludge is pumped through the nozzle, biogas is drawn from the headspace, mixed with the sludge, and re-injected into the digester under pressure. This creates both horizontal and vertical flow patterns, ensuring complete and effective 3D mixing throughout the digester.
• Automated Valves • Lower Mixing Nozzle • Chopper Pump
Landia GasMix
www.landiainc.com
5
Why Choose Landia GasMix? • Completely External Installation No moving parts inside the digester
• Easy Access and Maintenance Fewer man-hours required
• Improved health & safety
No personnel working at heights or in the gas zone
• Lower Lifecycle Cost
Reduced demands on tank construction
• Landia Chopper Pump Technology
Effective solids reduction - prevents clogging
• Improved Digester Performance Increased VS destruction
• Ideal for New Installations and Retrofits Alike
6
Landia GasMix
www.landiainc.com
Hot Tap Drilling Installation for Zero-Downtime Digester Upgrades The Landia GasMix system can be installed without emptying the digester, as all work is carried out externally. This allows the digester to remain in operation throughout the installation process, eliminating downtime and avoiding loss of production. Installation begins with positioning the tank wall connections, followed by controlled drilling through the tank wall.
A sealing arrangement is then applied to ensure a secure and leak-tight connection, after which the system is inserted without the need to open or empty the digester. The result is a fast, safe and cost-efficient installation with minimal environmental impact.
• No Downtime • Cost-Efficient • Safe and Quick Installation • Environmental Benefits
Landia GasMix
www.landiainc.com
7
AJ04A.C15
Landia, Inc. 2700 Gateway Centre Blvd, Suite 100 Morrisville, NC 27560 United States of America +1 (919) 466-0603 info@landiainc.com