SWEDISH WASTE MANAGEMENT |2010 - Avfall Sverige

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SWEDISH WASTE MANAGEMENT 2010 BIOLOGICAL TREATMENT In 2009, 617,680 tons of household waste was biologically treated – anaerobic digestion or composting. An increase of 3.4 percent compared to 2008. In total this means that 66.1 kg of waste – green waste and food waste – was biologically treated in 2009. The biological treatment now stands for 13.8 percent of the total quantity of treated household waste. 154 municipalities already have more or less implemented systems for collection of food waste, according to a new survey made by Avfall Sverige – Swedish Waste Management. 22 of these only collect food waste from restaurants and large-scale kitchens, while the remaining 132 municipalities have systems for households as well. The survey shows that an additional 63 municipalities are planning to introduce systems for sourceseparation of food waste. According to Avfall Sverige’s calculations, an estimated 21 percent of the food waste was biologically treated in 2009. Waste analysis shows that every Swedish resident produces close to 100 kg of food waste per year, mainly from fruit and vegetables. The most common system used for source separation of food waste in single-family houses is two separate bins, one for food waste and one for combustible waste. There is also the multi-compartment system where different fractions are separated into separate containers. Another collection system sometimes used, is optic sorting of different colored bags that are put into the same container. Through anaerobic digestion of biological waste, biogas, consisting of methane and carbon dioxide, is produced. Biogas is renewable and the most environmentally sound fuel available, and can be used for vehicle fuel, heating and electricity generation. In order to use the biogas as vehicle fuel and in natural gas pipelines, it needs to be processed and upgraded. In 2009, 317,440 MWh of biogas was produced, which is equivalent to 35 million liters of petrol. Biogas is today primarily used as vehicle fuel, a market that is growing fast. Another product from anaerobic digestion processes is digestate, an excellent fertilizer with a rich nutrient content. When using digestate instead of mineral fertilizers plant nutrients are preserved, for example phosphorus, which is a limited resource. In 2009, 498,720 tons of digestate was preserved, of which 97 percent was used in farming. The remaining 3 percent was either dehydrated and/or processed with after-composting. In 2009, 630,500 tons of waste was treated through composting, of which 85,620 tons was food waste. Compost is mainly used as soil improver or in soil mixes. Plants which produce compost or digestate from source separated bio-waste, including food waste from the food industry, can have their product quality marked with certification. 16
SWEDISH WASTE MANAGEMENT 2010 In 2009, 317,440 MWh of biogas was produced, which is equivalent to 35 million liters of petrol. 17
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SWEDISH WASTE MANAGEMENT |2010 - Avfall Sverige

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