Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 507689
Title Granular sludge formation and characterization in a chain elongation process
Author(s) Roghair, M.; Strik, D.P.B.T.B.; Steinbusch, K.J.J.; Weusthuis, R.A.; Bruins, M.E.; Buisman, C.J.N.
Source Process Biochemistry 51 (2016)10. - ISSN 1359-5113 - p. 1594 - 1598.
Department(s) Sub-department of Environmental Technology
Bioprocess Engineering
FBR Food Technology
Publication type Refereed Article in a scientific journal
Publication year 2016
Abstract Chain elongation is an open-culture biotechnological process which converts short chain fatty acids andan electron donor to medium chain fatty acids (MCFAs). With this letter we present the first observation ofgranular sludge formation in a chain elongation process. This discovery was made in a continuously stirredanaerobic reactor producing caproate (10.8 g L−1d−1) and heptanoate (1.8 g L−1d−1) as main MCFAs.Concurrently granular and suspended sludge were shaped and attributed to 85% and 15% respectively ofthe total sludge. Both sludge types showed equal product distributions and contributed similarly to MCFAproduction. Granules had irregular shapes, diameters up to ∼1.5 mm, settling velocities of 4–36 m h−1and contained micro-organisms with various shapes. The in-situ settler retained sludge in the bioreactorresulting in a SRT of 4.7 days at an HRT of 17 h. Granular sludge based chain elongation can be optimisedas a high rate biotechnological process.
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