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Behandling av fetthaltigt avloppsvatten: Ett växande problem i Åre kommun
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
2009 (Swedish)Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This project focuses on grease, separation of grease and the treatment of grease that has been separated. To adress this issue, I have searched the Internet and articles for information, been in contact with employees in different municipacities in Norrland and other experts in the trade. Businesses that produce wastewater with elevated grease levels must separate the grease from the wastewater, for example, through a grease trap. The basic principle for a grease trap is that grease separates from water because it is less dense. If a wastewater systems is a risk for exposure to sudden inflows of grease, it should be avoided and taken care of in a separate way. When the grease trap can no longer maintain its degree of efficiency, it should be emptied. Grease in the wastewater system causes problems such as blockages that cause flooding and release of untreated wastewater and increased costs. The separated sludge can be treated in different ways. The grease can be unloaded and added to the fermentation chamber in a bio-gas facility or for producing heat for district heating. The volume of the mass shrinks by letting the water drain off. Through freeze-drying, the water content of the sludge can be reduced further. After straining and freeze-drying, the sludge can be composted and construction soil can be created. For the company Reaxcer Miljö AB in Åre, taking care of the sludge by straining, freeze-drying and composting is of interest. Through this treatment, Reaxcer reduces the sludgetruck transports.

Place, publisher, year, edition, pages
2009. , 22 p.
Keyword [en]
grease, grease trap, sludge, treatment, water straining
National Category
Natural Sciences
URN: urn:nbn:se:umu:diva-31228OAI: diva2:291871

Available from: 2010-02-03 Created: 2010-02-03 Last updated: 2010-02-03Bibliographically approved

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