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.

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.

Improved Biological Phosphorus Removal Resulting from the Enrichment of Reactor Feed with Fermentation Products

1992 ◽  
Vol 26 (5-6) ◽  
pp. 943-953 ◽  
Author(s):  
L. H. Lötter ◽  
A. R. Pitman
Keyword(s):  
South Africa ◽  
Fatty Acids ◽  
Activated Sludge ◽  
Phosphorus Removal ◽  
Volatile Fatty Acids ◽  
Phosphate Removal ◽  
Biodegradable Materials ◽  
Biological Phosphorus Removal ◽  
Fermentation Products ◽  
Biological Phosphorus

Research in South Africa has highlighted the dependence of biological phosphate removal mechanisms on the presence of certain minimum concentrations of some readily biodegradable materials including interalia volatile fatty acids. Successful generation of these compounds has been achieved at recently commissioned facilities at three of Johannesburg' activated sludge plants. Elutriation of the volatile fatty acids from the sludge was achieved by recycling sludge to the influent sewage stream. Significant improvements in phosphate removal were observed, thus reducing the demand for chemical dosing to achieve the phosphate standard. In this paper the effect of altering the feed sewage characteristics on biological phosphorus removal is discussed.

Excess biological phosphorus removal in the activated sludge process using primary sludge fermentation

1986 ◽  
Vol 13 (3) ◽  
pp. 345-351 ◽  
Author(s):  
B. Rabinowitz ◽  
W. K. Oldham
Keyword(s):  
Fatty Acids ◽  
Activated Sludge ◽  
Phosphorus Removal ◽  
Volatile Fatty Acids ◽  
Phosphorus Release ◽  
Activated Sludge Process ◽  
Removal Mechanism ◽  
Biological Phosphorus Removal ◽  
Primary Sludge ◽  
Biological Phosphorus

This paper examines the role of short-chain volatile fatty acids in the excess biological phosphorus removal mechanism of the activated sludge process. The effectiveness of various substrate additions in inducing phosphorus removal was investigated through a series of laboratory and pilot-scale experiments. Phosphorus release and substrate uptake both take place in the anaerobic zone of the process and there appears to be an exchange phenomenon that occurs between the two molecules. The system phosphorus removal of the process is improved by the addition of sodium acetate to the anaerobic zone. It is important that the zone receives no incoming nitrate, as the added substrate will be oxidized in the denitrification reaction, rendering it unavailable for the phosphorus removal mechanism. Acetate and propionate, the two substrates that are most effective in inducing anaerobic phosphorus release, can be generated on-site at a treatment plant by primary sludge fermentation in concentrations sufficient to significantly enhance the phosphorus removal characteristics of the process. Key words: biological phosphorus removal, short-chain volatile fatty acids, phosphorus release, substrate utilization, primary sludge fermentation.

Enhancing biological phosphorus removal with glycerol

2010 ◽  
Vol 61 (7) ◽  
pp. 1837-1843 ◽  
Author(s):  
Q. Yuan ◽  
R. Sparling ◽  
P. Lagasse ◽  
Y. M. Lee ◽  
D. Taniguchi ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Carbon Source ◽  
Activated Sludge ◽  
Phosphorus Removal ◽  
Volatile Fatty Acids ◽  
Waste Activated Sludge ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
External Carbon Source ◽  
Biological Phosphorus

An enhanced biological phosphorus removal process (EBPR) was successfully operated in presence of acetate. When glycerol was substituted for acetate in the feed the EBPR process failed. Subsequently waste activated sludge (WAS) from the reactor was removed to an off-line fermenter. The same amount of glycerol was added to the WAS fermenter which led to significant volatile fatty acids (VFA) production. By supplying the system with the VFA-enriched supernatant of the fermentate, biological phosphorus removal was enhanced. It was concluded that, if glycerol was to be used as an external carbon source in EBPR, the effective approach was to ferment glycerol with waste activated sludge.

Fermentation of Raw Sludge and Elutriation of Resultant Fatty Acids to Promote Excess Biological Phosphorus Removal

1992 ◽  
Vol 25 (4-5) ◽  
pp. 185-194 ◽  
Author(s):  
A. R. Pitman ◽  
L. H. Lötter ◽  
W. V. Alexander ◽  
S. L. Deacon
Keyword(s):  
Fatty Acids ◽  
Phosphorus Removal ◽  
Volatile Fatty Acids ◽  
Phosphate Removal ◽  
High Rate ◽  
Biological Phosphorus Removal ◽  
Sludge Treatment ◽  
Primary Sludge ◽  
Treatment Facilities ◽  
Biological Phosphorus

Research in South Africa has highlighted the dependence of biological phosphate removal mechanisms on the presence of certain minimum concentrations of some readily biodegradable materials including interalia volatile fatty acids. Generation of these compounds was achieved on an experimental basis at the Johannesburg Northern Works by the fermentation of primary sludge either in primary settling tanks or off-line in high rate “acid” digesters. Elutriation of the volatile fatty acids from the sludge was achieved by recycling the sludge to the influent sewage stream. Significant improvements in phosphate removal were observed and it was decided to design primary sludge treatment facilities to specifically generate the volatile fatty acids. This paper describes the design philosophy adopted and discusses the preliminary results obtained from the recently commissioned plant at the Johannesburg Northern Works and Bushkoppie plants.

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.

The effect of volatile fatty acids on enhanced biological phosphorus removal and population structure in anaerobic/aerobic sequencing batch reactors

1997 ◽  
Vol 35 (1) ◽  
pp. 153-160 ◽  
Author(s):  
Andrew Amis Randall ◽  
Larry D. Benefield ◽  
William E. Hill ◽  
Jean-Paul Nicol ◽  
Gerald K. Boman ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Phosphorus Removal ◽  
Volatile Fatty Acids ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Slow Growth Rate ◽  
Biological Phosphorus ◽  
State Nature

Three anaerobic/aerobic sequencing batch reactors (SBRs) were operated for 5 1/2 years. Volatile fatty acids (VFAs) in influent wastewater for two of the SBRs (the Glucose 1 and 2 SBRs) resulted in optimization of enhanced biological phosphorus removal (EBPR), and a bacterial population capable of increasing phosphorus (P) removals in response to increased VFA or P concentration. Another SBR not receiving VFAs (the Starch SBR) showed marginal EBPR and was incapable of either response. All three anaerobic/aerobic sequencing batch reactors (SBRs) showed bounded oscillations in P removal that did not correspond to any operational or environmental change. The oscillations were probably associated with interspecies population dynamics intensified due to the periodic, unsteady-state, nature of the SBR process. The glucose SBRs also showed an additional type of variability associated with EBPR, probably from competition between poly-P and “G” bacteria for readily available substrate (i.e. glucose, VFAs) during anaerobiosis. The predominant bacterial isolates from the glucose SBRs were Pseudomonas and Bacillus while Aeromonas was isolated most frequently from the Starch SBR. The relatively slow growth rate of Pseudomonas may have contributed to the high variability of EBPR observed. Fractal analysis indicated overall variability may have been chaotic, but was inconclusive.

Sign in / Sign up

Export Citation Format

Share Document