A Study of the Performance of a High-Rate Photosynthetic Pond System

1987 ◽  
Vol 19 (12) ◽  
pp. 237-241 ◽  
Author(s):  
H. M. Pinheiro ◽  
M. T. Reis ◽  
J. M. Novais
Keyword(s):  
Sulfate Reducing Bacteria ◽  
Operating Conditions ◽  
High Rate ◽  
Purple Sulfur Bacteria ◽  
Residence Times ◽  
Sulfate Reducing ◽  
Pond System ◽  
Sulfur Bacteria ◽  
Colour Changes ◽  
Reducing Bacteria

Colour changes and other marked disturbances were observed at a high-rate photosynthetic pond system at Alcochete, Portugal. Previous chemical and microbiological tests made it possible to attribute these occurrences to the proliferation of purple sulfur bacteria, following the probable production of sulfide inside the ponds by sulfate-reducing bacteria. Results from more recent tests and observations are presented, which confirm the earlier conclusions, in addition to revealing a number of inadequacies in the ponds chosen operating conditions, which are in all probability at the origin of the observed disturbances. Corrective actions planned include a more efficient mixing of pond contents, the strict prevention of contamination with salty estuarine waters and the control of residence times and bottom sludge accumulation.

Interactions between filamentous sulfur bacteria, sulfate reducing bacteria and poly-P accumulating bacteria in anaerobic-oxic activated sludge from a municipal plant

1998 ◽  
Vol 37 (4-5) ◽  
pp. 599-603 ◽  
Author(s):  
Ryoko Yamamoto-Ikemoto ◽  
Saburo Matsui ◽  
Tomoaki Komori ◽  
Edja. Kofi. Bosque-Hamilton
Keyword(s):  
Activated Sludge ◽  
Sulfate Reduction ◽  
Reduction Rate ◽  
Sulfate Reducing Bacteria ◽  
Sulfate Reduction Rate ◽  
Filamentous Bulking ◽  
Sulfate Reducing ◽  
Sulfur Bacteria ◽  
Sulfate Reduction Rates ◽  
Reducing Bacteria

The interactions between filamentous sulfur bacteria (FSB), sulfate reducing bacteria (SRB) and poly-P accumulating bacteria (PAB) in the activated sludge of a municipal plant operated under anaerobic-oxic conditions were examined in batch experiments using return sludge (RAS) and settled sewage. Phosphate release and sulfate reduction occurred simultaneously under anaerobic conditions. SRB were more sensitive to temperature changes than PAB. SRB played an important role in the decomposition of propionate to acetate. When the sulfate reduction rates were high, there was a tendency for the maximum release of phosphate also to be high. This was explained by the fact that PAB utilized the acetate produced by SRB. Sulfur oxidizing bacteria were sensitive to temperature change. When the sulfate reduction rate was high, the sulfide oxidizing rate was also high and filamentous bulking occurred. The results showed that sulfate reduction was a cause of filamentous bulking due to Type 021N that could utilize reduced sulfur.

scholarly journals In Situ Analysis of Sulfate-Reducing Bacteria Related to Desulfocapsa thiozymogenes in the Chemocline of Meromictic Lake Cadagno (Switzerland)

2000 ◽  
Vol 66 (2) ◽  
pp. 820-824 ◽  
Author(s):  
Mauro Tonolla ◽  
Antonella Demarta ◽  
Sandro Peduzzi ◽  
Dittmar Hahn ◽  
Raffaele Peduzzi
Keyword(s):  
Sulfate Reducing Bacteria ◽  
Comparative Sequence Analysis ◽  
Potential Interaction ◽  
Meromictic Lake ◽  
Rrna Gene ◽  
Sulfate Reducing ◽  
Sulfur Bacteria ◽  
The Family ◽  
Reducing Bacteria

ABSTRACT Comparative sequence analysis of a 16S rRNA gene clone library from the chemocline of the meromictic Lake Cadagno (Switzerland) retrieved two clusters of sequences resembling sulfate-reducing bacteria within the family Desulfovibrionaceae. In situ hybridization showed that, similar to sulfate-reducing bacteria of the familyDesulfobacteriaceae, bacteria of one cluster with similarity values to the closest cultured relatives of between 92.6 and 93.1% resembled free cells or cells loosely attached to other cells or debris. Bacteria of the second cluster closely related toDesulfocapsa thiozymogenes DSM7269 with similarity values between 97.9 and 98.4% were generally associated with aggregates of different small-celled phototrophic sulfur bacteria, suggesting a potential interaction between the two groups of bacteria.

Granulation and immobilisation of methanogenic and sulfate-reducing bacteria in high-rate anaerobic reactors

1993 ◽  
Vol 40 (4) ◽  
pp. 575-581 ◽  
Author(s):  
A. Visser ◽  
P. A. Alphenaar ◽  
Y. Gao ◽  
G. van Rossum ◽  
G. Lettinga
Keyword(s):  
Sulfate Reducing Bacteria ◽  
High Rate ◽  
Sulfate Reducing ◽  
Anaerobic Reactors ◽  
Reducing Bacteria

Ecological interactions among denitrification, poly-P accumulation, sulfate reduction, and filamentous sulfur bacteria in activated sludge

1994 ◽  
Vol 30 (11) ◽  
pp. 201-210 ◽  
Author(s):  
Ryoko Yamamoto-Ikemoto ◽  
Saburo Matsui ◽  
Tomoaki Komori
Keyword(s):  
Sulfate Reduction ◽  
Reduction Rate ◽  
Sodium Molybdate ◽  
Sulfate Reducing Bacteria ◽  
Sulfate Reduction Rate ◽  
Filamentous Bulking ◽  
Sulfate Reducing ◽  
Sulfur Bacteria ◽  
P Accumulation ◽  
Reducing Bacteria

Effects of anoxic-oxic conditions on the growth of sulfate reduction, poly-P accumulation and filamentous sulfur bacteria were examined in the laboratory scale sequential batch reactors. In the anoxic-oxic conditions, denitrification bacteria are dominant. The growth of sulfate reducing bacteria and poly-P accumulating bacteria was suppressed. The number of sulfate reducing bacteria in the activated sludge was below 104 MPN/g MLSS, and the sulfate reduction rate was very low. Filamentous bulking was also suppressed. On the other hand, when nitrate was removed from the artificial wastewater, sulfate reducing bacteria could grow predominantly in the anaerobic conditions. The number of sulfate reducing bacteria was about 106∼107 MPN/g MLSS and the sulfate reduction rate increased (0.17 ∼ 0.21 g SO4/g MLSS·hr). Filamentous bacteria Type 021N increased over 103 cm/mg MLSS. Sodium molybdate was added to the artificial wastewater in order to prevent sulfate reduction. When the concentration of sodium molybdate increased to 980 mg/L, the number of sulfate reducing bacteria decreased to 103 ∼ 104 MPN/g MLSS and the sulfate reduction rate decreased. Filamentous bulking was completely suppressed in these conditions. These results show that sulfate reduction is a main trigger of the filamentous bulking due to Type 021N that can utilize reduced sulfur for an energy source.

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