Demonstration of an optimized system for biogas from biological waste and agricultural feedstock
Detailed description of the Good Practice
The work of establishing a biogas plant in Västerås, the ”Växtkraft-plant”, for the treatment of source separated household waste, ley crops, and other suitable organic waste, has been in progress for several years. Växtkraft in Swedish means the same as growth power. An agreement in principle
between VafabMiljö (the Solid-Waste Company of Västmanland), LRF (the National Federation of Swedish Farmers) and Mälarenergi, regarding the proprietorship and
operation of the plant, constituted the basis for the work. The objectives are to produce a thoroughly researched basis for the decision on the building of the Växtkraft-plant. Biological household waste and ley crop is co-digested in an energy effective anaerobic process. The gas is cleaned and used in
public transport buses and private cars in Västerås. The digestate is used as organic fertilizer by the local farmers.
In April, 2003, VafabMiljö, Mälarenergi, LRF (through the company Swede Agri Invest) and 17 local farmers established the company Svensk Växtkraft AB. The company is running the project, own and operate the biogas plants – biogas reactor and upgrading unit.
Objectives of the Good Practice
The purpose of the project is to create a sustainable recirculation of nutrition and energy between cities and rural areas where renewable energy can be generated.
Participants of the Good Practice
Target group of the Good Practice
citizens and farmers of the district
More Details of the Good Practice
What makes this project unique is that grass and organic municipal waste is co-digested and that the farmers
and the municipality has joined and formed a company to perform the project
The biogas-plant is situated adjacent to the other installations at the waste treatment plant at Gryta, in the northern outskirts of Västerås. In the plant, organic waste, ley crop and grease trap removal sludge are treated by digestion in a closed process.
The plant annually treats:
• 14 000 tonnes of clean, sourceseparated organic waste, with a dry matter content of 30 %, from households and institutional kitchens
• 4 000 tonnes of grease trap removal sludge, with a dry matter content of 4 %, from grease separators in institutional kitchens and restaurants
• 5 000 tonnes of ensilaged ley crop from a contracted ley acreage of 300 hectares cultivated by farmers who are also part-owners in the plant. The silage
have a dry matter content of 35 %
Documentation and documents
Organisation / Agency: Svensk växtkraft AB
Main contact: Per-Erik Persson
Address: 721 87 Västerås
Tel: +46 21-39 35 65, +46 70-465 35 65 Fax: +46 21-33 51 50
Data sources and references
(Accessed March, 24, 2010)