Effect of Supplemental Carbon Source on Phosphate Removal in an Alternating Activated Sludge Process

1993 ◽  
Vol 28 (11-12) ◽  
pp. 499-512 ◽  
Author(s):  
S. H. Isaacs ◽  
M. Henze ◽  
H. Søeberg ◽  
M. Kümmel
Keyword(s):  
Carbon Source ◽  
Activated Sludge ◽  
Nutrient Removal ◽  
Pilot Plant ◽  
Phosphate Uptake ◽  
Phosphate Removal ◽  
Activated Sludge Process ◽  
Significant Release

Pilot plant studies indicate that the addition of COD in the form of acetate to an alternating nutrient removal activated sludge process as a means to improve denitrification rates is not detrimental to biological phosphate removal. This is in spite of the fact that the added acetate can cause a significant release of phosphate during the anoxic phases in the aeration tanks. The added COD also appears to result in increased rates of aerobic phosphate uptake, thus improving the phosphate removal ability of the process. These observations are presented and discussed in the paper.

Examination of the Activated Sludge Model No. 2 with an alternating process

1995 ◽  
Vol 31 (2) ◽  
pp. 55-66 ◽  
Author(s):  
S. Isaacs ◽  
J. A. Hansen ◽  
K. Schmidt ◽  
M. Henze
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Pilot Plant ◽  
Pilot Scale ◽  
Phosphate Removal ◽  
Data Series ◽  
Batch Experiments ◽  
Phosphate Release ◽  
Activated Sludge Model ◽  
The Third

Three series of data obtained in a pilot-scale alternating-type activated sludge nutrient removal process are examined in light of the recently introduced Activated Sludge Model No. 2 (ASM2). The first data series was collected while adding acetate to the inlet to improve phosphate removal. ASM2 can explain why phosphate levels first rise before an improvement occurs based on a slow build-up of internally stored polyhydroxyalkanoates (PHA). The second and third data series represent batch experiments performed in the pilot plant, and show the effect of nitrate on phosphate release. ASM2 could describe the second data series well after including one additional reaction to account for denitrification by phosphate accumulating organisms. The third data series examines the effect of the rate of acetate addition, and shows that this affects the rate of anoxic phosphate release more strongly than it does the denitrification rate.

Interaction of Different Groups of Micro-Organisms in Biological Phosphate Removal

1985 ◽  
Vol 17 (11-12) ◽  
pp. 89-97 ◽  
Author(s):  
Karin E. U. Brodisch
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Continuous Flow ◽  
Phosphate Uptake ◽  
Phosphate Removal ◽  
Batch Experiments ◽  
Flow Conditions ◽  
End Products ◽  
Pure Cultures ◽  
Micro Organisms

Observations under continuous flow conditions in a bench-scale activated sludge unit and in full-scale nutrient removal activated sludge plants indicated that, despite relatively high numbers of Aoinetobaoter oalooaoetious, no enhanced biological phosphate removal was achieved. Total bacteriological analyses of the mixed liquor of these plants indicated that in all cases Aeromonas spp. were present in low numbers, particularly Aeromonas punotata. This bacterium is described as being able to produce acetate as one of its major fermentation end products. Phosphate uptake batch experiments using pure cultures showed that Aeromonas punotata enhances the phosphate uptake capability of Aoinetobaoter calooaoetious by converting carbohydrates present in the sewage to a substrate required for phosphate removal. It was shown that the anaerobic zone in a phosphate removing activated sludge plant is a fermentation reactor, where suitable substrates are generated rather than stress conditions imposed on the bacteria, a condition which was previously believed to be essential for enhanced phosphate uptake.

Operational Results of the Wolfsburg Wastewater Treatment Plant

1992 ◽  
Vol 25 (4-5) ◽  
pp. 203-209 ◽  
Author(s):  
R. Kayser ◽  
G. Stobbe ◽  
M. Werner
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Nitrogen Content ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Phosphate Removal ◽  
Total Nitrogen Content ◽  
Activated Sludge Process

At Wolfsburg for a load of 100,000 p.e., the step-feed activated sludge process for nitrogen removal is successfully in operation. Due to the high denitrification potential (BOD:TKN = 5:1) the effluent total nitrogen content can be kept below 10 mg l−1 N; furthermore by some enhanced biological phosphate removal about 80% phosphorus may be removed without any chemicals.

Verification of anoxic phosphate uptake as the main biochemical mechanism of the “dephanox” process

1997 ◽  
Vol 35 (10) ◽  
pp. 87-94 ◽  
Author(s):  
R. Sorm ◽  
J. Wanner ◽  
R. Saltarelli ◽  
G. Bortone ◽  
A. Tilche
Keyword(s):  
Activated Sludge ◽  
Nutrient Removal ◽  
Uptake Rate ◽  
Phosphate Uptake ◽  
Biochemical Mechanism ◽  
Batch Experiments ◽  
Batch Tests ◽  
Genetic Probes ◽  
Activated Sludge Systems ◽  
Removal System

The phenomenon of anoxic phosphate uptake with simultaneous denitrification was studied. For this purpose kinetic batch tests have been carried out by using the activated sludge samples from three modifications of nutrient removal activated sludge systems: two based on an anaerobic-anoxic-oxic (A2/O) system and a third on an anaerobic-oxic (A/O) system. The results showed significant differences in anoxic phosphate uptake rate between activated sludge which was alternatively exposed to anoxic conditions and activated sludge from the A/O arrangement. These differences were also accompanied by different denitrification rates. Simultaneously with batch experiments the microscopic observation of activated sludge samples was carried out. Neisser and Gram stained samples showed clear differences in shape, size and distribution of polyphosphate accumulating bacteria between A2/O and A/O Processes. Moreover, experiments performed using genetic probes confirmed the differences in microbiological composition of activated sludge samples from different nutrient removal system arrangements.

Observations Supporting Phosphate Removal by Biological Excess Uptake – A Review

1983 ◽  
Vol 15 (3-4) ◽  
pp. 15-41 ◽  
Author(s):  
G v R Marais ◽  
R E Loewenthal ◽  
I P Siebritz
Keyword(s):  
Activated Sludge ◽  
P Uptake ◽  
Phosphate Removal ◽  
Activated Sludge Process ◽  
Biochemical Mechanism ◽  
Paper Briefly ◽  
Uptake And Release

The paper briefly reviews the development of the biological excess removal of phosphorus in the activated sludge process, from 1959 when it was first observed to the present. It concludes by proposing, tentatively, a biochemical mechanism whereby excess P uptake and release can be explained.

Improvement of ammonia removal in activated sludge process with feedforward-feedback aeration controllers

2006 ◽  
Vol 53 (4-5) ◽  
pp. 125-132 ◽  
Author(s):  
Darko Vrečko ◽  
Nadja Hvala ◽  
Aljaž Stare ◽  
Olga Burica ◽  
Marjeta Stražar ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Pilot Plant ◽  
Pi Controller ◽  
Ammonia Removal ◽  
Activated Sludge Process ◽  
Aerobic Reactor

In the paper three linear aeration controllers that can be easily implemented are presented and evaluated on the activated sludge process pilot plant. Controllers differ according to the information that is used about the process, which can be oxygen in the last aerobic reactor, ammonia in the last aerobic reactor and ammonia in the influent. The aeration controllers that are addressed are: oxygen cascade PI controller, ammonia cascade PI controller and ammonia feedforward-cascade PI controller. Experiments show that, in comparison with the oxygen cascade PI controller, the ammonia cascade PI controller allows better control of effluent ammonia and airflow savings of around 23%, while the ammonia feedforward-cascade PI controller gives the best reduction of ammonia peaks and can save up to 45% of the airflow.

Design of nutrient removal activated sludge systems

2003 ◽  
Vol 47 (11) ◽  
pp. 115-122 ◽  
Author(s):  
J. Manga ◽  
J. Ferrer ◽  
A. Seco ◽  
F. Garcia-Usach
Keyword(s):  
Mathematical Model ◽  
Activated Sludge ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Pilot Plant ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
User Friendly ◽  
Biological Phosphorus ◽  
Activated Sludge Systems

A mechanistic mathematical model for nutrient and organic matter removal was used to describe the behavior of a nitrification denitrification enhanced biological phosphorus removal (NDEBPR) system. This model was implemented in a user-friendly software DESASS (design and simulation of activated sludge systems). A 484-L pilot plant was operated to verify the model results. The pilot plant was operated for three years over three different sludge ages. The validity of the model was confirmed with data from the pilot plant. Also, the utility of DESASS as a valuable tool for designing NDEBPR systems was confirmed.

Experience with Two-Stage Activated Sludge Plants for Industrial Wastewaters in Korea

1992 ◽  
Vol 25 (4-5) ◽  
pp. 427-428 ◽  
Author(s):  
R. Schulze-Rettmer ◽  
S. S. Kim ◽  
S. S. Son
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Pilot Plant ◽  
Treatment Plant ◽  
Activated Sludge Process ◽  
Two Stage ◽  
Industrial Wastewaters ◽  
Textile Dyeing ◽  
One Year

The two-stage activated sludge process (AB-process, i.e. adsorption activated sludge process) invented by Boehnke was successfully applied to several municipal and industrial wastewaters in Korea. The first large wastewater treatment plant for the combined effluents of 22 textile dyeing companies was constructed in Taegu and started operation in 1989. Two years earlier pilot plant runs were performed. The AB-process proved to be superior to any other activated sludge process. BOD was reduced from 1200 mg/l down to 24 mg/l. In the meantime in Korea several further AB-process treatment plants were constructed, the overall planning and constructing period being not longer than one year.

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