Biogest – PowerRing Complete Mix Digester

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Biogest – PowerRing Complete Mix Digester

About the Company:

BIOGEST is a European biogas plant manufacturer with its headquarters in Austria and subsidiaries in the UK, Italy, Romania, Serbia, the Czech Republic and the US. With a staff of around 50 employees, they have installed over 120 biogas plants generating electricity or biomethane. Their reference plants are located in many European countries, and the global market is served by licensed partners. Their biogas engineering operations extend along the entire biogas value chain, from project development to planning, financing, turnkey construction and operation (including service & maintenance)  of biogas plants with an output of 100 kW to 3,500 kW.


In addition to engineering, they are also actively operating in the fields of Biogas OPO (Own Plant Operations), energy efficiency and agriculture. Biogas plants are constructed using our tried-and-tested Biogest PowerRing technology which offers numerous advantages in terms of energy efficiency, operating safety and availability. PowerRing and PowerCompact biogas plants have been operating successfully for more than 10 years, installed at over 100 reference plants.

About the Solution:

The PowerRing is a highly efficient, 2-stage biogas plant which is suitable for operation with almost all substrates. Power output ranges from 250 kW to 2,000 kW and a biomethane production of 80m³/h to 500m³/h. The design is based on an external main digester and an internal post-digester. The main digester is a ring canal, thereby allowing a controlled plug flow. 

The PowerRing digester is equipped with a reinforced concrete roof, and complete insulation guarantees the highest levels of thermal efficiency. Due to the compact design of the plant, the tank can be simply scaled to the size required according to the desired output and the type and quantity of substrate.

A special characteristic of the PowerRing system is its outstanding agitation technology which has already proven its worth during long-term operation in several reference plants. Scientific studies using simulations have determined the ideal positioning of the agitators in order to achieve the best possible level of mixing and minimum energy consumption. Their ease of accessibility and external motors makes servicing the agitators a very simple procedure. 

Solid substrates are fed into the main digester using a solid substrate feed system, while liquid substrates are pumped. Using gravity and with no additional energy input, the fermented material (digestate) leaves the main digester via spillways, first into the post-digester and then to the final storage or intermediate buffer. The PowerRing draws on an extremely low proportion of the power it generates thanks to the agitator technique, feed in system and overall design.

The plant is completely automated and controlled via a user-friendly operating system. All the measurements and parameters which are of greatest importance to the biogas process are logged, allowing the plant processes to be recorded and permanently monitored on an ongoing basis. 

Biogest 3801 E Florida Ave., Suite 400 Denver, CO USA -23040 Visit Company Website

Solution Type

  • Anaerobic Digestion


  • Equipment Vendor
  • Project Developer


  • Energy


  • GHG
  • Odor
  • Pathogens

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Solution Strengths, Weaknesses and Critical Indicators

Anaerobic Digestion:

  • Long usable life and can be run reliably
  • Creates energy and generates environmental credits
  • Proper feeding & system monitoring is required to avoid system downtime
  • Proven technology for odor control
  • Proven technology for GHG reduction
  • Proven technology for pathogen reduction
  • Different types of systems produce varying gas production rates
  • Requires proper preparation of the feedstock
  • Requires other technologies for energy utilization
  • Requires other technologies for digestate handling
  • Requires other technologies to prevent nitrogen loss
  • Complex systems may require expertise not available on-farm

Newtrient Comments/Opinions:

Anaerobic Digester technology:

  • Is proven technology for odor, GHG and pathogen reduction and energy production
  • Has a long usable life and can be run reliably
  • Require proper preparation of the feedstock
  • Usually requires other technologies for energy utilization
  • Usually requires other technologies for digestate handling
  • Proper feeding & system monitoring is required to avoid system downtime
  Newtrient will continue to work with BioGest to further refine the cost and performance information as more information comes in with new commercial dairy installations.

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