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Investigations on the nitrogen inhibition during an anaerobic co-digestion process
University of Borås, School of Engineering.
University of Borås, School of Engineering.
2011 (English)Independent thesis Advanced level (degree of Master (One Year))Student thesis
Abstract [en]

Nitrogen Inhibition during an anaerobic co-digestion process was studied in this work. The substrate and inoculum used were obtained from a thermophilic biogas plant Sobacken, situated in Borås, Sweden. The batch experiments have been carried out in triplicate reactors with different concentrations of ammonia ranging from 2400mg/l to 3400mg/l. The batch experiment was working well for the all the concentrations of ammonia investigated. The average methane yield was around 0.65 Nm3 CH4/kgVS for all the reactors. The laboratory work has been further proceeded with a continuous process having two reactors working in parallel. Reactor 1 containing only substrate and the Reactor 2 contain substrate with surplus ammonia added to make final concentration of 3400mg/l. The reactors were operated at organic loading rate (OLR) of 3.3gVS/l/day and hydraulic retention time (HRT) of 20 days. Both reactors worked well for 29 days. During a period of an initial stable operation, the average methane production of Reactor 1 was 0.59 Nm3CH4/kgVS/day and for Reactor 2 the production rate was 0.56 Nm3CH4/kgVS/day. Then Reactor 1 showed a steady decrease in pH and methane production, while Reactor 2 showed stable operation for a few days longer with decreasing pH and methane production only from day 36. The composition of substrate was not optimal; therefore the inhibition level of ammonium could not be determined.

Place, publisher, year, edition, pages
University of Borås/School of Engineering , 2011.
Series
Magisteruppsats
Keywords [en]
anaerobic co-digestion, bts (buffer tank substrate), batch and continuous operations, thermophilic, ammonia
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hb:diva-20789Local ID: 2320/9120OAI: oai:DiVA.org:hb-20789DiVA, id: diva2:1312723
Available from: 2019-04-30 Created: 2019-04-30

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CiteExportLink to record
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Citation style
  • apa
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