Challenges of the rapid growth

Gasum Ltd.’s most Northern biogas plant is operating at Oulun Jätehuolto Ltd.’s area. At the end of 2016 the plant faced a situation where it needed an expansion to the treatment capacity to be able to treat all the waste that was coming in. The capacity had to be tripled, which took the plant’s efficiency to a whole new level.


  • Oulu Biogas Plant, Gasum Ltd.
  • Year: 2017
  • Capacity: 60,000 tn/a | 4 MW
  • Materials: Sludge, Source separated organic waste, food industry waste
  • Turnkey project


  • The operation of the plant could not be interrupted during the expansion works
  • The plant needed new waste reception and pre-treatment facilities
  • Tight schedule because the date for new incoming wastes was already agreed


  • The project was phased in a way that enabled to avoid interruptions to the operation
  • Innovative process and equipment solutions enabled inexpensive expansion works
  • The project was completed in its schedule due to Watrec’s experienced project management

Finland has always been among the leaders in adapting new technologies, and Oulu has been one of the hubs for Finnish innovations. This was also the driving factor for Oulun Jätehuolto Ltd. when they were looking for new ways to treat their waste. The company ended up to utilise state-of-the-art technology, which was Watrec’s Biogas Plant in this case.

Initially, Watrec designed and built the Oulu Plant already during the years 2014-2015. The plant, that was built in Oulun Jätehuolto’s Rusko waste management area, was designed to receive diverse range of materials – e.g. source separated organic waste as well as wastewater treatment sludge. While designing the plant, Watrec took into account the possibility for later capacity expansion which enabled more convenient and cheaper expansion later on.

The Oulu Biogas Plant was in operation for 1,5 years before it was obvious that the old 19 000 tn/a capacity was not anymore sufficient for the demand. Thanks to Watrec’s innovative design, the expansion could be implemented with a moderate additional investment. There were still challenges with tight schedule and operative requirements: the plant’s production could not interrupt during the expansion works. The challenging project demanded precise design and problem-solving skills of an experienced personnel. Through these qualities, we were able to carry out the project without any operational interruptions.


Faster schedule in the construction of a new reactor


the total length of the piles under the reactor

Progrees of the process:

  • Optimal conditions for construction work, which began during the spring time
  • Due to the tight schedule, Watrec worked through weekends to achieve the target date for commissioning
  • Limited possibilities for storing the building supplies and equipment which posed logistical challenges, but due to Watrec’s project management this was solved
  • The plant was in production during the whole construction project
  • Pre-treatment facility had a two-week interruption but due to Watrec’s innovative design this did not interrupt the whole plant’s operation
  • The new reception hall enabled more efficient pre-treatment



The benefits of Watrec to the client

  • The longest experience in the Nordics in designing and constructing reliable and robust plants
  • Watrec takes care of the customer’s needs throughout the project: we take care with the commissioning and ramp-up; we educate the operating personnel to operate the plant with professionalism
  • The ability for agile and flexible service to ensure the client’s needs are met
  • Flexible, Reliable, Scalable, Economic

Waste management solution that brings reliability and functionality


Practical experience has proved Watrec’s solutions’ reliability and functionality in treatment of municipal solid waste and industries side streams. Honkajoki Biogas Plant was delivered to serve the needs of the municipality and the food industry. The plant enables a long-term cooperation which ensures reliable and consistent waste treatment for the clients.

A cost-efficient and futureproof waste management system


Watrec carried out a modern organic waste management solution to serve the needs of municipal parties, replacing obsolete technology. By utilizing its expertise and functional biogas facility concept, Watrec built a modern organic waste management solution that addresses the end customer’s current and future requirements.

Challenges of the rapid growth


2016 the plant faced a situation where it needed an expansion to the treatment capacity to be able to treat all the waste that was coming in. The capacity had to be tripled, which took the plant’s efficiency to a whole new level.

Watrec Ltd

Nikkilänkatu 5 F, 30100 Forssa