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Start–up of a Thermophilic Digestion of Sewage Sludge from Mesophilic Conditions.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The purpose of this Master thesis is to study two different ways of start-up in anaerobic digesters under thermophilic conditions. As awareness for energy supply is growing, municipal waste water treatment uses a common treatment to stabilize sewage sludge which is called, anaerobic digestion (AD). Anaerobic digestion can transform the organic matter to combustible biogas which contains 60-70% methane. Biogas is usually referred to as a mixture of carbon dioxide (C02) and methane gas (CH4). The most common way to anaerobically treat sewage sludge at wastewater treatment plants in Sweden is on mesophilic conditions (30-40℃). Only 12 plants in the country treat sewage sludge in thermophilic conditions 50-60℃. Mesophilic digestion is considered as a more stable process but requires a longer hydraulic retention time to reach digestibility compared to thermophilic digestion. The higher temperature also enables a pathogenic destruction capacity which means that thermophilic digestion can be used as a sanitation method for sewage sludge.

Place, publisher, year, edition, pages
2016.
Series
TRITA-LWR Degree Project, ISSN 1651-064X ; 2016:24
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-199219OAI: oai:DiVA.org:kth-199219DiVA, id: diva2:1060828
Educational program
Degree of Master - Environmental Engineering and Sustainable Infrastructure
Supervisors
Examiners
Available from: 2016-12-30 Created: 2016-12-30 Last updated: 2016-12-30Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • de-DE
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Output format
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