Biological phosphorus removal with different organic substrates in an anaerobic/aerobic sequencing batch reactor

1997 ◽  
Vol 35 (1) ◽  
pp. 161-168 ◽  
Author(s):  
A. Carucci ◽  
M. Majone ◽  
R. Ramadori ◽  
S. Rossetti
Keyword(s):  
Phosphorus Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Energy Sources ◽  
Organic Substrates ◽  
Biological Phosphorus Removal ◽  
Anaerobic Conditions ◽  
And Storage ◽  
Biological Phosphorus ◽  
Hydrolysis Of

Experimental work was carried out with a lab-scale SBR, whose operation was divided into three runs: I run (glucose + acetate feed, 3′ fill), II run (only glucose feed, 3′ fill), III run (only glucose feed, 60′ fill). The results show that the bacteria growing in alternating anaerobic/aerobic systems can remove organic substrates under anaerobic conditions even without using the hydrolysis of polyphosphates or the transformation of glycogen into poly-hydroxyalkanoates as the energy sources for the uptake and storage of substrate. However, in the case of acetate plus glucose feed, EBPR can be steadily established with typical PP-bacteria like metabolism even if most of the COD removal takes place under not truly anaerobic conditions.

pH: Keyfactor in the Biological Phosphorus Removal Process

1994 ◽  
Vol 29 (7) ◽  
pp. 71-74 ◽  
Author(s):  
G. J. F. Smolders ◽  
M. C. M. van Loosdrecht ◽  
J. J. Heijnen
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Glycogen Metabolism ◽  
Activated Sludge Process ◽  
Biological Phosphorus Removal ◽  
Anaerobic Conditions ◽  
Biochemical Mechanisms ◽  
Biological Phosphorus

Experiments have been performed, using a sequencing batch reactor, to examine the effect of pH on biological phosphorus removal in the activated sludge process. The results, which indicate that glycogen metabolism occurs during anaerobic conditions, are useful in elucidating the biochemical mechanisms involved in phosphorus-removal, and have potential implications for systems such as Phostrip.

The influence of different substrates on enhanced biological phosphorus removal in a sequencing batch reactor

1997 ◽  
Vol 35 (1) ◽  
pp. 75-80 ◽  
Author(s):  
R. Tasli ◽  
N. Artan ◽  
D. Orhon
Keyword(s):  
Phosphorus Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
The Other ◽  
Organic Substrates ◽  
Relative Importance ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Batch Tests ◽  
Biological Phosphorus

All models of enhanced biological phosphorus removal (EBPR) define fermentable readily biodegradable substrate, without emphasizing the significance of its composition and the relative importance of different substrates. On the other hand, it is also known that substrates like glucose may be utilized without requiring poly-P energy, a phenomenon which deteriorates the EBPR performance. This paper reports an experimental study evaluating the effect of different organic substrates and their combinations on EBPR, in a sequencing batch reactor. Experimental data show that the EBPR efficiency is significantly affected by the increase of the glucose fraction in the feed, due to the probable dominance of G bacteria. Results of anaerobic batch tests also support this evaluation.

Bacteria and Protozoa Population Dynamics in Biological Phosphate Removal Systems

1994 ◽  
Vol 29 (7) ◽  
pp. 109-117 ◽  
Author(s):  
J. S. Čech ◽  
P. Hartman ◽  
M. Macek
Keyword(s):  
Population Dynamics ◽  
Phosphorus Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Sole Source ◽  
Phosphate Removal ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
System Collapse ◽  
Biological Phosphorus

Population dynamics of polyphosphate-accumulating bacteria (PP bacteria) was studied in a laboratory sequencing batch reactor simulating anaerobic-oxic sludge system. The competition between PP bacteria and another microorganism (“G bacteria”) for anaerobic-oxic utilization of acetate as the sole source of organic carbon was observed. The competition was found to be seriously influenced by protozoan and metazoan grazing: Predation-resistant “G bacteria” forming large compact flocs outcompeted PP bacteria. Several breakdowns of enhanced biological phosphorus removal were observed. The first one was related to the development of an euglenid flagellate Entosiphon sulcatus and attached ciliates Vorticella microstoma and V. campanula. The second system collapse was connected with a rapid proliferation of rotifers. An alternative-prey predation was thought to be a mechanism of PP bacteria elimination.

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