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Different Types of Anaerobic Digester Mixing Systems

Every type of anaerobic digester mixing system performs a common role. An anaerobic digestion plant plays a key role in turning wastewater treatment facilities into water resource recovery facilities. They maintain proper conditions for microorganisms that help grow methane. There are several types of anaerobic digester mixing systems and dewatering pump rental services, each performing its function in a unique way for the digester cleaning services. Here, we will discuss some of the methods.

Passive Systems

Under passive systems, there is an existing treatment component into which biogas is added. 

Covered Lagoon

This system is common because a lagoon requires low maintenance as it captures the biogas beneath an impervious cover. There are two cells needed to perform the function effectively. The first cell is covered while the second cell is uncovered. A lagoon is a digester cleaning system as well as storage. The level of liquid in the second cell should fall and rise to form storage; whereas, the liquid level on the first cell should stay constant to aid the breakdown of manure. 

1) Low-Rate Systems

In this system, the manure that flows through the digester is the primary source of creating microorganisms that form methane.

Complete Mix Digester

A complete mix digester is like a tank where manure is mixed and heated with numerous microorganisms. The volume in the digester is displaced with the incoming liquid; subsequently, an equal amount of liquid goes out during digester mixing. The displaced liquid is carried by methane-forming microorganisms.

Plug-Flow Digester

Plug-flow digester works in a similar way as a complete mix digester, that is, the volume in the digester is displaced with the incoming liquid (manure); subsequently, an equal amount of material goes out. The only difference is that the components of the plug-flow digester are thicker and prevent particles from setting to the bottom. 

2) High-Rate Systems

Under high-rate systems, the microorganisms that form methane are trapped into the digester in order to improve their efficiency.

Fixed Film Digester

A fixed film digester is accumulated with materials, including small plastic rings and wood chips. These materials are used to produce microorganisms that form methane. The liquid is passed through the materials to create an outflow. This method is also called anaerobic filters or attached growth digesters. The growth of the materials (that looks like slime) used in anaerobic digester mixing systems is called a biofilm. 

Suspended Media Digesters

In suspended media digesters, microorganisms are sent out in an upward flow. The liquid flow is set and adjusted to enable smaller particles and debris to flow out while the bigger ones remain inside the digester. Some designs also add artificial media for microbes to form a biofilm, such as sand. 


The process of anaerobic digestion is one of the most important components of energy-producing, modern wastewater dewatering treatment facilities. If you are looking for more information or have any queries regarding anaerobic digestion plant or digester cleaning services, please get in touch with us or visit our website.