The surprising breadth of biogas

How does biogas differ from other potential alternatives? Why are decision-makers interested in using biogas, and what brings doubts to their minds? And how can decision support be used to help them manage the complexity associated with biogas decisions? These questions are answered in a thesis recently presented at Linköping University.

Read more here.

Biogas facilities – the key to future industry

Researchers at Linköping University have investigated how a biogas facility can help the recirculation of nutrients in three industries: agriculture, the marine industry, and forestry. The results show clearly how a biogas facility associated with the industrial site stimulates industrial symbiosis, which is considered to be crucial in the conversion to a circular economy.

Read more.

Biogas in a Million City

During the spring we have arranged three workshops within the short BRC project “Biogas in a million city”. A report with the results from the project will be published in the beginning of the autumn.

Project leader Roozbeh Feiz gives us a brief overview of the results that will be presented.

The Biogas in a Million City project has provided a comprehensive view of the benefits of implementing biogas production based on the Nordic Model in a large city or region. Based on the availability of organic wastes in the city (or region) we have quantified and qualified four main types of benefits related to (1) producing and using biogas as a renewable fuel (2) producing and using digestate as renewable fertilizer and soil enhancer, (3) using anaerobic digestion to avoid poor waste management alternatives, and (4) other indirect and broader benefits for the city and region. Our priority is to provide simple and scientifically sound messages about the benefits of biogas solutions in a city so that interested actors can use them in their communication with their stakeholders, customers, and public relations.

Waste and biogas focus on workshop with American delegation

In the end of May a delegation of American city representatives visited Smart City Sweden and was able to see different best practice in Stockholm and in Helsingborg. As a part of the visit, the delegation visited Linköping digitally to learn more about biogas production and nutrient recycling – where they met both Tekniska Verken and BRC.

The represented cities at the visit were New York City, Atlanta, Pittsburgh, Cuyahoga County, Boston, Winchester, Seattle, Chula Vista, Boulder and Washington DC.

Read more about the visit here.

Dewater the digestate and recirculate part of the solids back to the biogas reactor!

Anaerobic digester units at wastewater treatment plants (WWTP) account for approximately half of the existing biogas production facilities in Sweden and their existing capacity can be used for more biogas production through co-digestion of energy-rich organic wastes. In this context, waste lipids are regarded as attractive co-substrates because of their high methane potential and energy density.

However, formation of long-chain fatty acids (LCFA) during anaerobic degradation of waste lipids and potential inhibitory effects on methanogenic activity make the use of waste lipids uncertain and challenging.

A new study from BRC shows that effluent solids recirculation improves microbial long-chain fatty acids degradation capacity, providing possibilities for co-digestion of larger amounts of waste lipids with municipal sludge.

Read more: “Effluent solids recirculation to municipal sludge digesters enhances long-chain fatty acids degradation capacity”

How green are renewable fuels?

BRC’s researchers have studied how the climate impact from different fuels is affected by the amount of electricity used in its production, and by how the electricity has been produced. This becomes very important if you analyze the climate impact of the fuel with a life-cycle perspective. Even if the emissions from a vehicle are small, or even zero, the climate impact may have been extensive when the electricity was produced.

– It is not enough to replace all cars with electric cars to have a sustainable transport system. How electricity is produced is just as important, but it is often forgotten. Ideally, you should also look at the electrical system first, before changing vehicles, says Marcus Gustafsson, associate professor and main author of the article.

The study compares the climate impact from a number of common energy carriers on three types of vehicles with slightly different driving cycles. In all the scenarios studied, biogas show the best outcome in terms of minimal negative climate effects – not electricity.

Read the full article about Marcus’ work here (in swedish)

If you want to read the scientific article, click here.