Cri-Man MXL Series - Lateral Mixer

The MXL Range is ideal for breaking crusts or homogenising fluids near to the solids inlet area of slurry storage tanks. The MXL has the same characteristics as Cri-Man's TBM mixer, but comes with the advantage of a motor and reduction unit external to the digester, and the possibility of reaching different points inside the digester with the mixing rotor.

Features

• Patented, self-supporting shaft
• Lateral external mounted motor
• Planetary gearbox for increased torque
• Axial thrust 2158 - 3826N
• Capacity 3286 - 6702m³/h
• Maximum propeller shaft length: 5.5m
• Propeller in stainless steel with a self-cleaning profile
• Maximum working temperature: 60°C
• ATEX-rated version available

Applications

• Biogas
• Slurry storage
• Homogenising fluids

Benefits

• Fully repairable
• Robust design

Lateral Mixer Performance in Slurry Tanks

The MXL lateral mixer would suit large slurry storage tanks with a diameter of over 30 metres when constant circulation is required to avoid sediment build-up and dead zones. This lateral mixer is mounted through the tank wall and is typically used in conjunction with the TBM mixer range.  Its self-cleaning rotor design keeps the mixture in constant suspension in the digester to enhance the overall process efficiency. It has high-capacity mixing, with a maximum capacity of approximately 6,700 m3/h at a given configuration, as all slurry and biogas feedstocks are quickly homogenised.

Lateral Mixers for Biogas and AD Plants

In biogas and anaerobic digestion plants, a correctly specified lateral mixer is critical for maintaining an even distribution of substrates to support stable gas production. The MXL Series lateral mixer can be configured in various shaft lengths and installation angles to suit different digester geometries, helping operators optimise residence time and reduce energy consumption compared with alternative mixing methods. Combining the MXL lateral mixer with internal mixing systems in larger tanks provides uniform mixing from the feed point through to final digestate storage.​

Why Choose an External Lateral Mixer?

Choosing an external lateral mixer, such as the MXL, reduces potential downtime by keeping the motor and gearbox outside the tank, simplifying inspection and repair. The patented self-supporting shaft and stainless-steel construction deliver a robust design that withstands abrasive slurry, while the self-cleaning propeller profile minimises fibre wrapping and unplanned stoppages. With an ATEX-rated option, the MXL lateral mixer is also suitable for hazardous biogas environments where safety and reliability are paramount.​

FAQS

What is a lateral mixer?

A lateral mixer is a side-entry mixer installed through the tank wall to create horizontal circulation and keep slurry or digestate in suspension. Unlike submersible mixers, a lateral mixer has its drive unit outside the tank, making maintenance easier and reducing the need to empty the tank for servicing.​

How do lateral mixers improve anaerobic digestion performance?

Lateral mixers keep solids and microorganisms evenly distributed, which supports stable anaerobic digestion and consistent biogas production. By preventing crust formation and sediment build-up, a lateral mixer helps maintain efficient contact between bacteria and feedstock, reducing process upsets.​

Where should a lateral mixer be installed in a slurry tank?

A lateral mixer is typically installed through the side wall of the tank, positioned to create a strong horizontal flow path that sweeps across the tank floor and up the opposite wall. Correct orientation and angle, coupled horizontal mixing systems ensure that the full tank volume is turned over, minimising dead zones and keeping the slurry perfectly homogenised.​

What maintenance does a lateral mixer require?

Lateral mixers typically require periodic lubrication, gearbox oil changes, and seal and bearing inspection to ensure consistent operation in abrasive slurry. This is easier to maintain with external, side-mounted designs, since the motor and drive components are external to the liquid.