SymbioCity takes a holistic approach to sustainable development. We find potential synergies in urban functions and unlock their efficiency and profitability. The SymbioCity Biogas Offer proposes practical ways to save money and energy by producing fuel from sewage and waste.
The SymbioCity Biogas Offer
Several systems now operating in Sweden cover the entire biogas value chain. SymbioCity Biogas Offer can provide full service and making maximum use of system synergies. Several sources of substrates are available: waste, wastewater, sewage, manure, seaweed, algae and energy crops. Typical steps in the value chain include:
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Make money from sludge
Every city produces large amounts of waste and sewage. But instead of getting rid of it we can put it to good use. Biomass in the sludge from sewage treatment plants and in organic household garbage and other food waste is rich in energy. You only need to convert it into methane – biogas.
Clean biomethane is a powerful fuel identical to fossil natural gas. It can be fed into the local gas grid or upgraded and used locally as vehicle fuel.
As a bonus, the digested sludge makes great biofertilizer and reduces odour and nutrient leakage to the soil and water.
Success story: NSR biogas plant in Helsingborg
- 100% of the household waste is sorted at source, treated, recycled or recovered as energy.
- 37 % of the organic fraction is extracted for biogas production, the highest share in Sweden.
- The biogas is upgraded to natural gas quality and used as vehicle fuel. The amount of gas is sufficient to supply the entire Public Bus System.
- The residual sludge, finest bio fertilizer, is transported to farmers by a pipe line network. This pipe line saves 22 000 km transport and reduces CO2 emission by 40 tonnes/year.
Associated companies
Sweco, Läckeby-Purac, Malmberg, Nordic Water, ITT (Flygt), ABS (Cardo), Beijer Electronics, ÅF, WSP, Tyréns, Grontmij, Biomil, Bioprocess Control, Anox-Kaldnes