Title
Transient behaviour and time aspects of intermittently and continuously fed bacterial cultures with regard to filamentous bulking of activated sludge
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
article
Publication
Berlin ,
Subject
Engineering sciences. Technology
Source (journal)
Applied microbiology and biotechnology. - Berlin, 1984, currens
Volume/pages
19(1984) :1 , p. 44-52
ISSN
0175-7598
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Pure culture transient experiments with Arthrobacter globiformis and Sphaerotilus natans revealed that the floc-forming species A. globiformis can adapt better to intermittent feeding (I-feeding) than the filamentous species S. natans. The floc-forming bacterium showed a larger overcapacity for substrate uptake, a larger accumulation of reserves (polysaccharides and poly-β-hydroxybutyric acid) and a more efficient mobilization of these polymers. As a consequence A. globiformis became dominant in an I-fed dual culture of S. natans and A. globiformis. The transient behaviour of filamentous continuously fed (C-fed) sludge was similar to the response of S. natans. Consequently, I-feeding of activated sludge could prevent the excessive growth of filamentous bacteria. I-fed sludge, showed a higher overcapacity, the accumulation of more reserves and a shorter lag phase in protein synthesis than C-fed activated sludge, during the transient response, after a pulse dose of substrate. However, to be effective in the control of bulking, the frequency of I-feeding should allow for a sufficiently long endogenous phase. In addition the available fraction of the COD is important in the optimization of I-feeding as a control strategy for filamentous bulking.