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Syresättning av avloppsvatten: En undersökning av luftningsmetoder på reningsverk
Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
Linnaeus University, Faculty of Technology, Kalmar Maritime Academy.
2015 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [sv]

På begäran av Marinfloc AB har en studie gjorts där ett antal faktorer undersökts som påverkar behandlingen av avloppsvattnet på olika reningsverk. Mätningarna har utförts på respektive anläggnings biologiska steg där de organiska material och ämnen bryts ner. De faktorer som har granskats är vilka metoder som används för att syresätta avloppsvattnet, vilken syrehalt som uppnås och hur mycket energi syresättningen förbrukar. Ett test gjordes också på Marinflocs egna anläggning där vi undersökte om det är någon skillnad i tid att syresätta rent vatten kontra obehandlat avloppsvatten. Undersökningarna visade att de 4 landbaserade reningsverken som besöktes syresätter avloppsvattnet efter samma princip, genom bottenluftning, och att de samtliga ligger på en syrehalt mellan 1,8 – 5,9 mg syre per liter vatten. Marinflocs nuvarande anläggning använder sig av en annan metod än de övriga och ligger på en syrehalt om cirka 12 mg/l. De visade sig att det tar längre tid att syresätta obehandlat avloppsvatten än rent vatten på deras anläggning. 

Abstract [en]

This essay has been done at the request of Marinfloc AB. It consists of various measurements and experiments investigating the sewage water treatment on a number of different plants. The measurements were executed in the part of the plants called secondary treatment. The objective with secondary treatment is to let micro-organisms remove dissolved and suspended biological and organic matter. The factors which were investigated were which methods are used to oxygenate the sewage water, what level of oxygen saturation is obtained with each method and the power consumption required oxygenating the sewage water. An experiment was carried out on Marinflocs’ own sewage treatment plant with the objective to determine if there is any time difference in oxygenating pure water versus unprocessed sewage water. The conclusion reached was that the four land-based sewage treatment plants that were investigated oxygenate by the same principle. The oxygenation is done by aeration from the bottom in respective aeration tank. The level of oxygen saturation was between 1, 8 – 5, 9 mg oxygen per liter sewage water in all plants. Marinflocs’ current sewage treatment plant uses another principle to oxygenate and its oxygen saturation was measured to a level of 12 mg/l. The experiment on Marinflocs’ own sewage treatment plant concluded that there is a time difference in oxygenating pure water versus unprocessed sewage water. The pure water gets oxygenated faster. 

Place, publisher, year, edition, pages
2015. , 32 p.
Keyword [sv]
Marinfloc, Reningsverk, Avloppsvatten, Syresättningsmetoder
National Category
Water Treatment
Identifiers
URN: urn:nbn:se:lnu:diva-43794OAI: oai:DiVA.org:lnu-43794DiVA: diva2:818382
Subject / course
Chief Engineer
Educational program
Marine Engineering Programme (4 years) with onboard practical training placement, 180 credits
Supervisors
Examiners
Available from: 2015-06-09 Created: 2015-06-08 Last updated: 2015-06-09Bibliographically approved

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8a2b4773c6cd7e53b8a2334bb3ac090a00a3d8e63eab97e4231c1e97ae5f8bbece2e966a0959c75b90bafa539ae80bb2d13426b79c2397859b22d56d08415237
Type fulltextMimetype application/pdf

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Water Treatment

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