Colsen – Thermophilic Anaerobic Digestion

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Colsen – Thermophilic Anaerobic Digestion

water, energy & environment

About the Company:

Colsen headquarter are located in the Netherlands. Colsen’s customer base is in the food-processing industry and in the communal & industrial waste water area.

Colsen is specialized in the execution of projects in the area of water treatment and energy production via (anaerobic) digestion. The Colsen activities range from problem solving, design and engineering, project management, construction supervision, commissioning as well as operation & maintenance support. Colsen has a very flexible organization and used to provide tailor made solutions for Colsen’s clients in a multidisciplinary setting. Colsen’s world-wide business scope covers technology developments, installations delivery and products & services in the fields of water treatment, sustainable energy and environmental protection.

About the Solution:

Fermentation represents a natural and anaerobic dissimilation process during which organic biomass is transformed into simpler organic compouds. Certain bacterial strains are capable of converting organic material mainly into methane (CH4), carbon dioxide (CO2) and water. The efficiency of the conversion is determined by the system and the nature of the substrate. This anaerobic digestion process takes place in two different ranges on the temperature scale, i.e. from 30-40°C (mesophilic range) and from 50-55°C (thermophilic range). Thermophilic digestion is often applied for treatment of industrial organic waste products, WWTP sludge or manure. It is also possible to combine various waste streams, which is then called co-digestion. An additional advantage of thermophilic digestion is that the greater part of pathogens, viruses and germs are pasteurized during digestion at elevated temperature.

Colsen Kreekzoom 3 4561 GX Hulst , The Netherlands Visit Company Website

Solution Type

  • Anaerobic Digestion


  • Equipment Vendor


  • Concentrated Nutrients


  • GHG
  • Odor
  • Pathogens

To view additional information about this vendor, click below.

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
Colsen is an international company with extensive experience in the treatment of dairy and other animal agricultural wastes in Europe. Colsen is actively looking for partners in the USA and Canada to do wastewater and manure treatment projects with their technologies.

Colsen has not been evaluated using Newtrient's 9-point scoring process because, although their process appears to be suited for use on dairy manure, Newtrient is not aware of any current dairy based projects in North America. Newtrient will work with Colsen to refine the cost and performance information as more information comes in with commercial dairy installations in North America.

Newtrient 9-Point Scoring Rating

View the Scoring Page

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