Some 60,000 tonnes of organic waste are collected by BSR every year in the city’s BIOGUT bins. Since the summer of 2013, this organic waste has been treated in the newly-erected biogas fermentation plant in Berlin-Ruhleben. Recycling and energy recovery mean that in comparison with the composting procedures previously used it has been possible to reduce emissions of greenhouse gases. The biogas plant of BSR in Ruhleben has a capacity of 60,000 tonnes. The plant operates using the dry fermentation method. Microorganisms from the organic waste generate the biogas. This method is particularly suitable for organic waste with a water content of 60–80%, which is typical for kitchen waste from Berlin households. After the biogas has been cleaned, treated and concentrated, it consists of 98% methane, and is therefore chemically identical with natural gas. After having been prepared in this way it can therefore be fed into the gas supply so that the natural gas vehicles used by BSR for waste collection can be refuelled at its own filling points. In the coming years it will be possible for BSR to operate as many as 150 natural gas vehicle
Biogas Fermentation Plant