Effects of an Activated Primary Settling Tank on Biological Phosphorus Removal

1992 ◽  
Vol 26 (9-11) ◽  
pp. 2199-2202 ◽  
Author(s):  
D. Wedi
Keyword(s):  
Phosphorus Removal ◽  
Volatile Fatty Acids ◽  
Ph Value ◽  
Settling Tank ◽  
Treatment Plant ◽  
Gas Production ◽  
Organic Load ◽  
Biological Phosphorus Removal ◽  
Batch Tests ◽  
Biological Phosphorus

This poster describes results and experiences gained at the wastewater treatment plant of the city of Hirblingen to improve the biological phosphorus removal. Investigations were carried out to study the accumulation of volatile fatty acids in an activated primary settling tank (PST), and in the Extended Anerobic Sludge Contact (EASC) Process. The effluent of the activated primary settling tank provided no higher concentrations of VFA compared with the efffluent of of regular settling tank. Laboratory batch-tests confirmed these results. The elimination of Ntot and Ptot was marginally improved, the gas production in the digester decreased. In batch tests the production of VFA was examined in correlation of organic load, pH value and temperature.

Biological Phophorus Removal: Study of the Main Parameters

1984 ◽  
Vol 16 (10-11) ◽  
pp. 173-185 ◽  
Author(s):  
D Malnou ◽  
M Meganck ◽  
G M Faup ◽  
M du Rostu
Keyword(s):  
Fatty Acids ◽  
Bacterial Strain ◽  
Phosphorus Removal ◽  
Volatile Fatty Acids ◽  
Organic Substances ◽  
Biological Phosphorus Removal ◽  
Batch Tests ◽  
Microbiological Examination ◽  
Biological Phosphorus ◽  
Phosphorus Storage

The biological phosphorus removal phenomenon has been studied in a modified “Phoredox” type pilot plant. The interpretation of the results obtained was facilitated by batch tests on the sludge. The influence of the duration of anaerobiosis, the presence of nitrates and various organic substances in the anaerobic zone were thus studied successively. The results obtained tend to confirm the hypothesis that biological phosphorus removal is due primarily to the bacterial strain Acinetobacter. Microbiological examination of the sludge has revealed the presence of these bacteria and that of acidogenic bacteria producing volatile fatty acids promoting the growth of Acinetobacter. Pure culture tests have confirmed the possibility of a greater phosphorus storage capability of Acinetobacter.

Enhanced biological phosphorus removal process implemented in membrane bioreactors to improve phosphorous recovery and recycling

2003 ◽  
Vol 48 (1) ◽  
pp. 87-94 ◽  
Author(s):  
B. Lesjean ◽  
R. Gnirss ◽  
C. Adam ◽  
M. Kraume ◽  
F. Luck
Keyword(s):  
Phosphorus Removal ◽  
Theoretical Calculations ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
P Limitation ◽  
Batch Tests ◽  
P Content ◽  
On Line ◽  
Biological Phosphorus ◽  
P Removal

The enhanced biological phosphorus removal (EBPR) process was adapted to membrane bioreactor (MBR) technology. One bench-scale plant (BSP, 200-250 L) and two pilot plants (PPs, 1,000-3,000 L each) were operated under several configurations, including pre-denitrification and post-denitrification without addition of carbon source, and two solid retention times (SRT) of 15 and 26 d. The trials showed that efficient Bio-P removal can be achieved with MBR systems, in both pre- and post-denitrification configurations. EBPR dynamics could be clearly demonstrated through batch-tests, on-line measurements, profile analyses, P-spiking trials, and mass balances. High P-removal performances were achieved even with high SRT of 26 d, as around 9 mgP/L could be reliably removed. After stabilisation, the sludge exhibited phosphorus contents of around 2.4%TS. When spiked with phosphorus (no P-limitation), P-content could increase up to 6%TS. The sludge is therefore well suited to agricultural reuse with important fertilising values. Theoretical calculations showed that increased sludge age should result in a greater P-content. This could not be clearly demonstrated by the trials. This effect should be all the more significant as the influent is low in suspended solids.

Saving phosphorus removal at the Henderson NV plant

2012 ◽  
Vol 65 (7) ◽  
pp. 1318-1322 ◽  
Author(s):  
J. Barnard ◽  
D. Houweling ◽  
H. Analla ◽  
M. Steichen
Keyword(s):  
Fatty Acids ◽  
Phosphorus Removal ◽  
Volatile Fatty Acids ◽  
Biological Phosphorus Removal ◽  
Case Histories ◽  
Mixed Liquor ◽  
Removal Process ◽  
Low Levels ◽  
Anaerobic Zone ◽  
Biological Phosphorus

While the mechanism of biological phosphorus removal (BPR) and the need for volatile fatty acids (VFA) have been well researched and documented to the point where it is now possible to design a plant with a very reliable phosphorus removal process using formal flow sheets, BPR is still observed in a number of plants that have no designated anaerobic zone, which was considered essential for phosphorus removal. Some examples are given in this paper. A theory is proposed and then applied to solve problems with a shortage of VFA in the influent of the Henderson NV plant. Mixed liquor was fermented in the anaerobic zone, which resulted in phosphorus removal to very low levels. This paper will discuss some of the background, and some case histories and applications, and present a simple postulation as to the mechanism and efforts at modelling the results.

Retrofitting and Operation of Small Extended Aeration Plants for Advanced Treatment – Some Experiences in Japan

1993 ◽  
Vol 28 (10) ◽  
pp. 377-385 ◽  
Author(s):  
K. Moriyama ◽  
M. Takahashi ◽  
Y. Harada
Keyword(s):  
Phosphorus Removal ◽  
Settling Tank ◽  
Phosphorus Release ◽  
Biological Phosphorus Removal ◽  
Removal Process ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Oxic Zone ◽  
Secondary Settling ◽  
Biological Phosphorus

Some experiences concerning a retrofit design and operation for nutrients removal in small extended aeration plants are presented. In this study a new biological phosphorus removal process as well as a biological nitrogen removal process based on a sequential oxic-anoxic-oxic process is investigated. The denitrification in the first oxic zone has a high removing effect for nitrogen, and the oxidation reduction potential (ORP) value and dissolved oxygen (DO) concentration are useful indexes to maintain the optimum conditions of the first oxic zone for simultaneous denitrification. It is verified that the simultaneous denitrification can alleviate the alkalinity deficit problem against full nitrification by a stoichiometric analysis of alkalinity throughout the entire process. Additionally, a biological phosphorus removal process which uses a sludge blanket zone of secondary settling tank for phosphorus release is proposed.

Uncertainty and variability in enhanced biological phosphorus removal (EBPR) stoichiometry: consequences for process modelling and optimization

2010 ◽  
Vol 61 (7) ◽  
pp. 1793-1800 ◽  
Author(s):  
Dwight Houweling ◽  
Yves Comeau ◽  
Imre Takács ◽  
Peter Dold
Keyword(s):  
Phosphorus Removal ◽  
Volatile Fatty Acids ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Feed Composition ◽  
P Limitation ◽  
Polyphosphate Accumulating Organisms ◽  
Biological Phosphorus ◽  
P Removal

The overall potential for enhanced biological phosphorus removal (EBPR) in the activated sludge process is constrained by the availability of volatile fatty acids (VFAs). The efficiency with which polyphosphate accumulating organisms (PAOs) use these VFAs for P-removal, however, is determined by the stoichiometric ratios governing their anaerobic and aerobic metabolism. While changes in anaerobic stoichiometry due to environmental conditions do affect EBPR performance to a certain degree, model-based analyses indicate that variability in aerobic stoichiometry has the greatest impact. Long-term deterioration in EBPR performance in an experimental SBR system undergoing P-limitation can be predicted as the consequence of competition between PAOs and GAOs. However, the observed rapid decrease in P-release after the change in feed composition is not consistent with a gradual shift in population.

Applicability of experience from laboratory reactors with biological phosphorus removal in full-scale plants

2006 ◽  
Vol 54 (1) ◽  
pp. 267-275 ◽  
Author(s):  
E. Tykesson ◽  
L.L. Blackall ◽  
Y. Kong ◽  
P.H. Nielsen ◽  
J. la Cour Jansen
Keyword(s):  
Phosphorus Removal ◽  
Wastewater Treatment Plants ◽  
In Situ Hybridisation ◽  
Full Scale ◽  
Fluorescence In Situ Hybridisation ◽  
Biological Phosphorus Removal ◽  
Batch Tests ◽  
P Release ◽  
Biological Phosphorus

Enhanced biological phosphorus removal (EBPR) has been used at many wastewater treatment plants all over the world for many years. In this study a full-scale sludge with good EBPR was tested with P-release batch tests and combined FISH/MAR (fluorescence in situ hybridisation and microautoradiography). Proposed models of PAOs and GAOs (polyphosphate- and glycogen-accumulating organisms) and microbial methods suggested from studies of laboratory reactors were found to be applicable also on sludge from full-scale plants. Dependency of pH and the uptake of both acetate and propionate were studied and used for calculations for verifying the models and results from microbial methods. All rates found from the batch tests with acetate were higher than in the batch tests with propionate, which was explained by the finding that only those parts of the bacterial community that were able to take up acetate anaerobically were able to take up propionate anaerobically.

The effect of fermentation products on enhanced biological phosphorus removal, polyphosphate storage, and microbial population dynamics

1994 ◽  
Vol 30 (6) ◽  
pp. 213-219 ◽  
Author(s):  
A. A. Randall ◽  
L. D. Benefield ◽  
W. E. Hill
Keyword(s):  
Population Dynamics ◽  
Carboxylic Acids ◽  
Phosphorus Removal ◽  
Microbial Population ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Fermentation Products ◽  
Batch Tests ◽  
Glucose System ◽  
Biological Phosphorus

Using anaerobic/aerobic sequencing batch reactors (SBRs) it was found that pre-fermentation of influent glucose resulted in a microbial population capable of enhanced biological phosphorus removal (EBPR). Batch tests indicated the C1-C5 carboxylic acids, except propionate, typically improved phosphorus removal. Branched molecules were superior to their linear isomers. The C1-C5 alcohols did not affect removal. Glucose, propionate, and an amino-acid rich substrate were detrimental. Using NMR spectroscopy it was observed that intracellular forms and locations of phosphorus did not change regardless of the substrate received. Polyphosphate (polyP) was present throughout the cells at the end of aerobiosis. It then degraded to inorganic phosphate via a zero-order enzymatic reaction concentrated at the cell membrane. An anaerobic/aerobic SBR receiving starch, rather than glucose fermentation products, showed only marginal EBPR and did not respond to carboxylic acids or other substrates in batch tests. Pseudomonas and Bacillus were numerous in the glucose system but were not isolated from the starch system. Aeromonas were dominant in the starch system. Although the glucose system showed better phosphorus removal than the starch system, it also showed greater variability. Phosphorus removal varied in a chaotic, but bounded, manner, probably due to population dynamics.

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