Change search
ReferencesLink to record
Permanent link

Direct link
The Effect of Effluent Recirculation in a Semi-Continuous Two-Stage Anaerobic Digestion System
University of Borås, School of Engineering.
University of Borås, School of Engineering.
University of Borås, School of Engineering.ORCID iD: 0000-0003-4887-2433
2013 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 6, no 6, 2966-2981 p.Article in journal (Refereed)
Sustainable development
The content falls within the scope of Sustainable Development
Abstract [en]

The effect of recirculation in increasing organic loading rate (OLR) and decreasing hydraulic retention time (HRT) in a semi-continuous two-stage anaerobic digestion system using stirred tank reactor (CSTR) and an upflow anaerobic sludge bed (UASB) was evaluated. Two-parallel processes were in operation for 100 days, one with recirculation (closed system) and the other without recirculation (open system). For this purpose, two structurally different carbohydrate-based substrates were used; starch and cotton. The digestion of starch and cotton in the closed system resulted in production of 91% and 80% of the theoretical methane yield during the first 60 days. In contrast, in the open system the methane yield was decreased to 82% and 56% of the theoretical value, for starch and cotton, respectively. The OLR could successfully be increased to 4 gVS/L/day for cotton and 10 gVS/L/day for starch. It is concluded that the recirculation supports the microorganisms for effective hydrolysis of polyhydrocarbons in CSTR and to preserve the nutrients in the system at higher OLRs, thereby improving the overall performance and stability of the process.

Place, publisher, year, edition, pages
M D P I AG , 2013. Vol. 6, no 6, 2966-2981 p.
Keyword [en]
two-stage anaerobic digestion, recirculation effect, UASB, CSTR, cotton, starch, Resursåtervinning
National Category
Engineering and Technology
Research subject
Resource Recovery
URN: urn:nbn:se:hb:diva-1585DOI: 10.3390/en6062966ISI: 000320773700014Local ID: 2320/12381OAI: diva2:869643
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2016-03-03

Open Access in DiVA

fulltext(357 kB)19 downloads
File information
File name FULLTEXT01.pdfFile size 357 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Aslanzadeh, SolmazRajendran, KarthikTaherzadeh, Mohammad J.
By organisation
School of Engineering
In the same journal
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar
Total: 19 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 135 hits
ReferencesLink to record
Permanent link

Direct link