Biogas production based on park waste - does Helsingborg have the potential?

Sammanfattning: Biogas is a renewable fuel produced from various kinds of organic biomass primarily considered as waste from today's society. The biogas today are used as fuel in heat and electricity or upgraded to vehicle gas. There are ambitious national and local targets for biogas in Sweden, where within a few years they want to see a comprehensive increase in production and use of biogas. Likewise, it’s becoming increasingly popular that cities strive to become more circular with their resources by consider waste as a resource. This is something Helsingborg city development department is working on right now, by giving the plant-based waste from park areas in Helsingborg a new purpose as a substrate in local biogas production. The study investigated the potential of using park waste in biogas production, but also briefly examine whether it’s possible to strengthen the circular aspect by producing biochar from the digestion residue. The result show that there is a potential in producing biogas from park waste, but with the digestion technique available in Helsingborg today, only the soft and moist fractions can be digested. The most optimal would be to build a dry-digestion plant in Helsingborg, since this kind of plant can digest all fractions from the park waste. Furthermore, the result showed that the digestion residue are best suited as a biofertilizer and it can be considered unnecessary to produce biochar from it. In conclusion, the result is only considered as an indication since no practical tests have been performed.