Abstract
Life Cycle Assessment was applied to municipal planning in a study of waste water systems in Bergsjön, a Göteborg suburb, and Hamburgsund, a coastal village. Existing waste water treatment consists of mechanical, biological and chemical treatment. The heat in the waste water from Bergsjön is recovered for the district heating system. One alternative studied encompassed pretreatment, anaerobic digestion or drying of the solid fraction and treatment of the liquid fraction in sand filter beds. In another alternative, urine, faeces and grey water would separately be conducted out of the buildings. The urine would be used as fertilizer, whereas faeces would be digested or dried, before used in agriculture. The grey water would be treated in filter beds. Changes in the waste water system would affect surrounding technical systems (drinking water production, district heating and fertilizer production). This was approached through system enlargement. For Hamburgsund, both alternatives showed lower environmental impact than the existing system, and the urine separation system the lowest. Bergsjön results were more difficult to interpret. Energy consumption was lowest for the existing system, whereas air emissions were lower for the alternatives. Water emissions increased for some parameters and decreased for others. Phosphorous recovery was high for all three alternatives, whereas there was virtually no nitrogen recovery until urine separation was introduced.
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Tillman, AM., Svingby, M. & Lundström, H. Life cycle assessment of municipal waste water systems. Int. J. LCA. 3, 145–157 (1998). https://doi.org/10.1007/BF02978823
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DOI: https://doi.org/10.1007/BF02978823
Keywords
- Anaerobic digestion
- waste water treatment
- biological waste water treatment
- case studies
- chemical waste water treatment
- Life Cycle Assessment (LCA)
- LCA
- mechanical waste water treatment
- municipal waste water systems
- nutrient recycling
- pretreatment
- waste water
- sewage
- sewerage
- urine separation
- waste water system
- waste water treatment