From Sewage and Waste to Biogas

stikkord:forbruk og avfall,avfallsbehandling og -gjenvinning,oslo

From problem to resource! In a few years all buses in Oslo will be running on climate neutral bio fuel – from the public’s recycled food waste and wastewater from the sewer.

From problem to resource! In a few years all buses in Oslo will be running on climate neutral bio fuel – from the public’s recycled food waste and wastewater from the sewer.

When waste is thrown straight on the dump, greenhouse gases, like methane, are formed. We miss out on valuable resources that could have been recycled, we often define it as resources a stray.

In Oslo, discharge from waste disposal sites has been reduced dramatically because domestic waste is no longer dumped at Grønmo disposal site.

Today, the domestic waste is used as fuel in Oslo’s district heating system. Future plans are that more waste will be recycled into new products and new energy, which means further reductions in Oslo’s greenhouse gas emissions.

By the end of 2011 the whole of Oslo will recycle plastic and food waste. A pilot project includes 17 000 households and starts in October 2009.

From Food Waste and Sewage to Fuel

In the circulation based disposal system, food waste will be gathered and disposed in a bio gas plant from 2012. In this plant, biogas from the decomposition of food waste will be gathered and upgraded to fuel quality and used in the Oslo buses. This biogas plant will also produce bio fertilizer. This fertilizer is rich on plant nutrients, and can be used in agriculture or reused for different agricultural or fertilizing products. This plant will produce enough fertilizer for about 100 medium-sized farms.

In addition to biogas from food waste, Oslo Municipality in february 2010 opened å plant to transfor biogas from the sewage treatment into fuel. Until 2007, the gas from this plant was used to dry out the mud produced by drain cleansing. This mud drying process was both expensive and created major dust problems.

Less Waste, Emissions and Noise

The advantage of  exchanging diesel with biogas from waste and sewer is that we get less greenhouse gas emissions, improved air quality in the city and less noisy buses. We also transform what previously was a waste problem into a local resource. It is calculated that these two projects will produce enough biogas to run 170 buses, this equals a reduction of 10 000 tons of annual CO2 emissions. At the same time, Vestfjorden avløpsselskap (VEAS) (Vestfjorden Waste Water Company) is working on a new biogas plant in Slemmestad. This plant can provide biogas for another 200 buses.