An/OSBR Process for Phosphorus Removal Effect of Different Sludge Load and Nitrate Concentration Condition

2013 ◽  
Vol 864-867 ◽  
pp. 1886-1889
Author(s):  
Xiao Yan Tian ◽  
Liang Wang
Keyword(s):  
Carbon Source ◽  
Linear Relationship ◽  
Phosphorus Removal ◽  
Nitrate Concentration ◽  
Phosphorus Concentration ◽  
Biological Phosphorus Removal ◽  
Nitrate Concentrations ◽  
Biological Phosphorus ◽  
Anaerobic Reaction ◽  
Concentration Condition

Based on An / OSBR, the paper explores the different sludge loading and nitrate concentrations under the conditions of An / OSBR effects of biological phosphorus removal systems.The influent phosphorus concentration constant at 10 ± 0.5mg / L, in order to compare the end of the anaerobic and effluent TP concentration.The results showed that: ①With the increasing of nitrate concentrations , PAOs release phosphorus in the anaerobic reaction zone is decreased, nitrate appears to reduce the synthesis of PHB, which is due to PHB synthesis and denitrification requires a simple carbon source as hydrogen donor, resulting in competition;② With the COD sludge load increases, the effluent TP concentration decreased, when the COD sludge load ≥ 0.46mgCOD/mgMLSS · d, the effluent TP concentrations is less than 1mg / L;③ When the reaction temperature was 25 °C and 15 °C , the releasing phosphorus in anaerobic and COD sludge load have a good correlation,Linear relationship between the two were: y = 0.72 +71.91 x ( 25 °C), y = 2.81 +73.33 x (15 °C);

Biological phosphorus removal in anoxic-aerobic sequencing batch reactor with starch as sole carbon source

2016 ◽  
Vol 75 (1) ◽  
pp. 28-38 ◽  
Author(s):  
Dacheng Luo ◽  
Linjiang Yuan ◽  
Lun Liu ◽  
Lu Chai ◽  
Xin Wang
Keyword(s):  
Carbon Source ◽  
Anaerobic Condition ◽  
Phosphorus Removal ◽  
Sole Carbon Source ◽  
Phosphorus Release ◽  
Bulk Liquid ◽  
Phosphorus Concentration ◽  
Biological Phosphorus Removal ◽  
Idle Period ◽  
Biological Phosphorus

In traditional biological phosphorus removal (BPR), phosphorus release in anaerobic stage is the prerequisite of phosphorus excessive uptake in aerobic conditions. Moreover, when low molecular weight of the organic substance such as volatile fatty acids (VFAs) is scarce in bulk liquid or anaerobic condition does not exist, phosphate accumulating organisms (PAOs) have difficulty removing phosphorus. However, in this work, phosphorus removal in two anoxic-aerobic sequencing batch reactors (SBRs) was observed when starch was supplied as a sole carbon source. The relations of the BPR with idle period were investigated in the two identical SBRs; the idle times were set to 0.5 hr (R1) and 4 hr (R2), respectively. Results of the study showed that, in the two SBRs, phosphorus concentrations of 0.26–3.11 mg/L in effluent were obtained after aeration when phosphorus concentration in influent was about 8 mg/L. Moreover, lower accumulations/transformations of polyhydroxyalkanoates (PHAs) and higher transformation of glycogen occurred in the SBRs, indicating that glycogen was the main energy source that was different from the traditional mechanism of BPR. Under the different idle time, the phosphorus removal was a little different. In R2, which had a longer idle period, phosphorus release was very obvious just as occurs in a anaerobic–aerobic regime, but there was a special phenomenon of chemical oxygen demand increase, while VFAs had no notable change. It is speculated that PAOs can assimilate organic compounds in the mixed liquor, which were generated from glycolysis by fermentative organisms, coupled with phosphorus release. In R1, which had a very short idle period, anaerobic condition did not exist; phosphorus removal rate reached 63%. It is implied that a new metabolic pathway can occur even without anaerobic phosphorus release when starch is supplied as the sole carbon source.

Experience from 10 years of full-scale operation with enhanced biological phosphorus removal at Öresundsverket

2005 ◽  
Vol 52 (12) ◽  
pp. 151-159 ◽  
Author(s):  
E. Tykesson ◽  
L.-E. Jönsson ◽  
J. la Cour Jansen
Keyword(s):  
Phosphorus Removal ◽  
Volatile Fatty Acids ◽  
Stable Process ◽  
Full Scale ◽  
Phosphorus Concentration ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Sludge Hydrolysis ◽  
Low Levels ◽  
Biological Phosphorus

Ten years of full-scale experience with enhanced biological phosphorus removal (EBPR) has been evaluated. During the start-up period lack of carbon source was the main operational problem and a higher level of volatile fatty acids was secured by introducing a primary sludge hydrolysis. Acidic thermal sludge hydrolysis was used as the sludge treatment method at the plant during about three years. One effluent stream, rich in carbon and precipitant, was brought back to the process leading to an improvement of the phosphorus removal both by an improved biological process and chemical precipitation. A quite stable process of EBPR was developed with low levels of effluent phosphorus concentration. Stringent effluent discharge limits during short evaluation periods necessitated a continued work for improvement of the short-term stability. During periods with lack of carbon, such as industrial holiday or rainy periods, both simultaneous precipitation and reduced aeration have been successfully tested as strategies for securing low levels of effluent phosphorus.

Simultaneous removal of organic and strong nitrogen from sewage in a pilot-scale BNR process supplemented with food waste

2004 ◽  
Vol 49 (5-6) ◽  
pp. 257-264 ◽  
Author(s):  
S.R. Chae ◽  
S.H. Lee ◽  
J.O. Kim ◽  
B.C. Paik ◽  
Y.C. Song ◽  
...  
Keyword(s):  
Carbon Source ◽  
Food Waste ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Pilot Scale ◽  
Biological Nutrient Removal ◽  
Biological Phosphorus Removal ◽  
External Carbon Source ◽  
N Removal ◽  
Biological Phosphorus

As the sewerage system is incomplete, sewage in Korea lacks easily biodegradable organics for nutrient removal. In this country, about 11,400 tons of food waste of high organic materials is produced daily. Therefore, the potential of food waste as an external carbon source was examined in a pilot-scale BNR (biological nutrient removal) process for a half year. It was found that as the supply of the external carbon increased, the average removal efficiencies of T-N (total nitrogen) and T-P (total phosphorus) increased from 53% and 55% to 97% and 93%, respectively. VFAs (volatile fatty acids) concentration of the external carbon source strongly affected denitrification efficiency and EBPR (enhanced biological phosphorus removal) activity. Biological phosphorus removal was increased to 93% when T-N removal efficiency increased from 78% to 97%. In this study, several kinds of PHAs (poly-hydroxyalkanoates) in cells were observed. The observed PHAs was composed of 37% 3HB (poly-3- hydroxybutyrate), 47% 3HV (poly-3-hydroxyvalerate), 9% 3HH (poly-3-hydroxyhexanoate), 5% 3HO (poly-3-hydroxyoctanoate), and 2% 3HD (poly-3-hydroxydecanoate).

Morphology, In-Situ characterization with rRNA targetted probes and respiratory quinone profiles of enhanced biological phosphorus removal sludge

1998 ◽  
Vol 38 (8-9) ◽  
pp. 69-76 ◽  
Author(s):  
I. M. Sudiana ◽  
T. Mino ◽  
H. Satoh ◽  
T. Matsuo
Keyword(s):  
Carbon Source ◽  
Activated Sludge ◽  
Microbial Communities ◽  
Phosphorus Removal ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
In Situ Characterization ◽  
Respiratory Quinone ◽  
Biological Phosphorus

The microbial communities in activated sludge acclimated with either acetate or glucose as the major carbon source under phosphorus limited or rich conditions were investigated morphologically, phylogenetically and chemotaxonomically. The sludge with a minimized polyphosphate content was dominated by tetrad shaped bacteria, which were suspected to be ‘glycogen accumulating bacteria (GAOs) or G bacteria’ The sludge containing high polyphosphate was dominated by cluster forming coccus bacteria. Quinone analyses suggested that all the sludge tested contained various ubiquinones and menaquinones, of which the ubiquinones Q-8 and Q-10 were dominant. Analyses with rRNA targeted probes showed that beta sub class of Proteobacteria was most predominant in all sludges tested. Morphological, phylogenetic and chemotaxonomic investigation all indicated that both high and low P sludges are microbiologically diverse.

Reduction of coagulant amount added to activated sludge for phosphorus removal

2004 ◽  
Vol 50 (7) ◽  
pp. 287-292 ◽  
Author(s):  
J. Nakajima ◽  
I. Mishima
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Phosphorus Concentration ◽  
Activated Sludge Process ◽  
Biological Phosphorus Removal ◽  
Fe Content ◽  
The Stability ◽  
And Behavior ◽  
Biological Phosphorus ◽  
Removal Model

Adding coagulant to the activated sludge process is effective in maintaining the stability of phosphorus removal. However, the precise mechanisms of the reaction and behavior of coagulants and phosphorus are not well known. By introducing a new phosphorus removal model (PRM), the behavior of coagulant and phosphorus in the process could be described. The experimental data of the effluent phosphorus concentration and Fe content in the activated sludge agreed with the values calculated by PRM. The amount of coagulant addition to the activated sludge process for phosphorus removal is reduced with the enhanced biological phosphorus removal process. It is suggested that the amount of reduction is determined by using PRM.

Effect of Internal Recycle Ratio on the Phosphorus Removal Efficiency of Anaerobic/Anoxic/Oxic (A2/O) to Low Concentration of Organic Substance Wastewater

2011 ◽  
Vol 393-395 ◽  
pp. 688-691
Author(s):  
Ning Wang ◽  
Ying He Jiang ◽  
Bo Fu Li
Keyword(s):  
Carbon Source ◽  
Organic Substance ◽  
Phosphorus Removal ◽  
Pilot Scale ◽  
Biological Phosphorus Removal ◽  
High Concentration ◽  
Denitrifying Phosphorus Removal ◽  
Low Level ◽  
Recycle Ratio ◽  
Biological Phosphorus

In the pilot-scale plant, the effect of internal recycle ratios (300%, 200%, 100%, and 0%) on the biological phosphorus removal was represented. The denitrifying phosphorus removal in anoxic tank was improved with low internal recycle, under the inhibition of high concentration of NOx-N. To low level strength wastewater (average COD 185.6 mg/L, average BOD 115.2 mg/L), the low level carbon source maintained the relatively steady phosphorus removal rates.

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