Landia GasMix

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.

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 eliminates the need to open the digester for inspection, service or repair of the mixing system.

For the operator, this means:

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.

This:

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Improves digestion efficiency

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revents clogging of pipes and P nozzles

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nsures stable, predictable E operation

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Continuous operation with no digester downtime

Mixing is carried out in multiple zones to ensure complete and stable conditions throughout the digester.

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No loss of gas production due to maintenance

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Full service access without process interruption

Upper-zone injection entrains biogas, supporting gas release and biological activity

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Improved safety with no confined space entry

Lower-zone injection delivers powerful bulk mixing

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Optional top injection prevents surface crust formation

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Low and predictable maintenance costs

Efficient digestion, stable plant performance, and long-term reliability of the digester.

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Landia GasMix

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The Digester Mixing System.

Mixing Nozzle Upper Crust Breaker

The mixing process is carried out in stages: 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.

Landia GasMix 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.

Mixing Nozzle Lower

Recirculation through the upper and lower nozzles creates rotational flow throughout the digester, ensuring complete mixing.

A key component of the GasMix system is the chopper pump. It delivers the required flow and pressure to the nozzles while reducing solids to smaller particles, supporting a stable and efficient biogas process.

Chopper Pump

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• Mixing Nozzle Upper

• 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 • Mixing Nozzle Lower • Chopper Pump

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Why Choose Landia GasMix? • 100% gas-tight system No loss of methane or CO2

• Easy service and routine maintenance Fewer man-hours required

• Improved health & safety No personnel working in the gas zone

• No gas leaks or temperature drop During maintenance

• Landia chopper pump technology

Effective solids reduction - prevents clogging

• Lower lifecycle assessment Reduced demands on tank construction

• Minimal space required for service

Compared to other digester mixers

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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.

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.

Installation begins with positioning the tank wall connections, followed by controlled drilling through the tank wall.

• No Downtime • Cost-Efficient • Safe and Quick Installation • Environmental Benefits

Landia GasMix

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AJ04A.C15

Landia A/S Industrivej 2 DK-6940 Lem St. tel +45 97 34 12 44 info@landia.dk