Full-Scale Cyclic Activated Sludge System Phosphorus Removal

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2253-2256 ◽  
Author(s):  
M. C. Goronszy
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Full Scale ◽  
Biological Phosphorus Removal ◽  
Fill Ratio ◽  
Variable Volume ◽  
Activated Sludge System ◽  
Sludge Bulking ◽  
Volume Mode ◽  
Biological Phosphorus

The performance of three full-scale cyclic activated sludge facilities, operated for biological phosphorus removal is demonstrated. The facilities are operated without formal mixed anoxic or anaerobic sequences in a variable volume mode. The system is independent of fill-ratio operation for filamentous sludge bulking control.

Practical Investigations on Bulking and Foaming in Activated Sludge Plants with Biological Phosphorus Removal

1994 ◽  
Vol 29 (7) ◽  
pp. 289-294 ◽  
Author(s):  
S. Kunst ◽  
M. Reins
Keyword(s):  
Activated Sludge ◽  
Microscopic Observation ◽  
Phosphorus Removal ◽  
Practical Investigations ◽  
Biological Phosphorus Removal ◽  
Sludge Bulking ◽  
Filamentous Microorganisms ◽  
Intensive Observation ◽  
Biological Phosphorus

Six processes implemented at treatment plants with biological phosphorus removal aiming to avert sludge bulking were examined systematically. Intensive observation of the filamentous microorganisms (characterised according to a new scheme) and microscopic observation of sludge structures are used to identify the significant organisms and their bulking behaviour.

Background to Biological Phosphorus Removal

1983 ◽  
Vol 15 (3-4) ◽  
pp. 1-13 ◽  
Author(s):  
James L Barnard
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Plug Flow ◽  
Full Scale ◽  
Biological Phosphorus Removal ◽  
Anaerobic Conditions ◽  
Paper Briefly ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Biological Phosphorus

This paper briefly summarizes the early work on phosphorus removal in activated sludge plants in the U.S.A. and observed that such removals only occurred in low SRT plants of the plug flow type and in the Phostrip plants, neither designed for full nitrification. The discovery of simultaneous nitrogen and phosphorus removal, as well as full-scale experiments are discussed. The Phoredox process was proposed utilizing internal recycling for the removal of nitrates and an anaerobic first stage in which the incoming feed is used to obtain the necessary anaerobic conditions, essential as a conditioning step for the uptake of phosphorus. Proposed mechanisms are discussed.

Comparison of nutrient-removing microbial communities in activated sludge from full-scale MBRs and conventional plants

2013 ◽  
Vol 68 (2) ◽  
pp. 366-371 ◽  
Author(s):  
A. M. Saunders ◽  
P. Larsen ◽  
P. H. Nielsen
Keyword(s):  
Activated Sludge ◽  
Microbial Communities ◽  
Phosphorus Removal ◽  
Membrane Bioreactors ◽  
Full Scale ◽  
Biological Phosphorus Removal ◽  
Conventional Activated Sludge ◽  
16S Rrna Pyrosequencing ◽  
Biological Phosphorus

The composition of nutrient-removing microbial communities in five full-scale membrane bioreactors (MBRs) was investigated using fluorescence in situ hybridization and 16S rRNA pyrosequencing and compared to similar analyses of conventional activated sludge (CAS) communities. The communities were highly similar but some genera that are always present in enhanced biological phosphorus removal (EBPR) (core groups) were absent in the MBRs. The overall phylogenetic similarity of the communities indicated that these differences were primarily closely related groups. More research is needed to establish the operational significance of the observed differences between MBR and CAS sludge.

Enhanced biological phosphorus removal in the retrofitting from an anoxic selector to an anaerobic selector in a full-scale activated sludge process in Singapore

2009 ◽  
Vol 59 (5) ◽  
pp. 857-865 ◽  
Author(s):  
Y. Cao ◽  
C. M. Ang ◽  
K. C. Chua ◽  
F. W. Woo ◽  
H. Chi ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Oxygen Demand ◽  
P Uptake ◽  
Full Scale ◽  
Activated Sludge Process ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Biological Phosphorus ◽  
Final Effluent

This paper presents the investigation results of retrofitting an anoxic selector to an anaerobic selector through stepwise reduction of air supply in a full-scale activated sludge process with a focus on enhanced biological phosphorus removal (EBPR). The process experienced gradual shift from a Ludzack-Ettinger (LE) to an anaerobic-anoxic-oxic (A2O) process and subsequently, an anaerobic-oxic (A/O) process. The major findings are: (i) the average influent-based PO43−-P release in the anaerobic selector compartment was 16.3 mg P l−1 and that in the secondary clarifier was 1.7 mg P l−1. 75% of the SCOD and 93% of the acetic acid in the primary effluent were taken up in the anaerobic selector compartment, respectively; (ii) PO43−-P uptake contributed by both aerobic and denitrifying phosphorus accumulating organisms (DPAOs) occurred mainly in the first and second aerobic lanes together with simultaneous nitrification and denitrification (SND) while there was not much contribution from the last aerobic lane; (iii) The average PO43−-P concentration of the final effluent was 2.4 mg P l−1 corresponding to a removal efficiency of 85%; (iv) the SVI was satisfactory after retrofitting; and (v) the increase of NH4+-N in the final effluent from the commencement to the completion of the retrofitting resulted in an approximate 40–50% reduction in oxygen demand and a significant aeration energy saving was achieved.

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