Enhancing biological phosphorus removal from municipal wastewater with partial simultaneous precipitation

2002 ◽  
Vol 46 (4-5) ◽  
pp. 249-255 ◽  
Author(s):  
M. Valve ◽  
P. Rantanen ◽  
J. Kallio
Keyword(s):  
Phosphorus Removal ◽  
Municipal Wastewater ◽  
Ferrous Sulphate ◽  
Pilot Scale ◽  
Precipitation Process ◽  
Biological Phosphorus Removal ◽  
Removal Process ◽  
The Poor ◽  
Centrifugation Method ◽  
Biological Phosphorus

Pilot-scale tests to enhance phosphorus removal with ferrous sulphate in a biological phosphorus and nitrogen removal process (modified UCT) for treating municipal wastewater were performed. The results indicated that Fe(II) competes with the BioP organisms and will inhibit the biological phosphorus removal process completely at doses exceeding 9 g m−3 of Fe(II). The goal of an effluent P level of 0.5 mg l−1 can be attained with 5 g m−3 of Fe(II). A consistent effluent concentration of 0.3 mg l−1 could not be achieved with this method. A centrifugation method to evaluate the dewatering properties of sludge was developed. Comparison of the settling and dewatering properties between activated sludge from the pilot plant and a full-scale simultaneous precipitation process indicated no consistent differences between them. The poor settling properties are due to the long sludge retention time needed by nitrification and not to the biological phosphorus removal process.

Microbial community of biological phosphorus removal process fed with municipal wastewater under different electron acceptor conditions

2006 ◽  
Vol 54 (1) ◽  
pp. 81-89 ◽  
Author(s):  
T. Shoji ◽  
T. Nittami ◽  
M. Onuki ◽  
H. Satoh ◽  
T. Mino
Keyword(s):  
Microbial Community ◽  
16S Rrna ◽  
Electron Acceptor ◽  
Phosphorus Removal ◽  
Municipal Wastewater ◽  
Rrna Gene ◽  
Significant Shift ◽  
Biological Phosphorus Removal ◽  
Removal Process ◽  
Biological Phosphorus

The microbial community in a biological phosphorus removal process under different electron acceptor conditions was estimated by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) assay and principal-component analysis (PCA). For this purpose, a lab-scale sequencing batch reactor (SBR) fed with municipal wastewater was operated under anaerobic–aerobic, anaerobic–anoxic–aerobic and anaerobic–anoxic conditions. The results of PCR-DGGE targeting the 16S rRNA gene indicated a significant shift in the microbial community with electron acceptor conditions. From the 16S rRNA-based PCA, the microbial shift implies that little oxygen supply caused the deterioration of aerobic bacteria, including aerobic polyphosphate-accumulating organisms (PAOs). Moreover, it also reflects the existence of nitrate-utilizing denitrifiers. On the other hand, although the band patterns of DGGE targeting a functional gene of denitrification (nirS) also showed the microbial shift, the result of PCA differed from that of 16S rRNA-based analysis. There is no conclusive proof that the bacteria represented as the dominant bands detected in the present study are denitrifying-PAOs so far, it should be worthwhile to identify the detected bacteria and to examine their traits as new denitrifying-PAO candidates.

Heterotrophic Kinetic Parameter Estimation for Enhanced Biological Phosphorus Removal Processes Operated in Conventional and Membrane-Assisted Modes

2006 ◽  
Vol 41 (1) ◽  
pp. 72-83 ◽  
Author(s):  
Zhe Zhang ◽  
Eric R. Hall
Keyword(s):  
Parameter Estimation ◽  
Phosphorus Removal ◽  
Growth Yield ◽  
Pilot Scale ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Parameter Values ◽  
The Impact ◽  
Biological Phosphorus

Abstract Parameter estimation and wastewater characterization are crucial for modelling of the membrane enhanced biological phosphorus removal (MEBPR) process. Prior to determining the values of a subset of kinetic and stoichiometric parameters used in ASM No. 2 (ASM2), the carbon, nitrogen and phosphorus fractions of influent wastewater at the University of British Columbia (UBC) pilot plant were characterized. It was found that the UBC wastewater contained fractions of volatile acids (SA), readily fermentable biodegradable COD (SF) and slowly biodegradable COD (XS) that fell within the ASM2 default value ranges. The contents of soluble inert COD (SI) and particulate inert COD (XI) were somewhat higher than ASM2 default values. Mixed liquor samples from pilot-scale MEBPR and conventional enhanced biological phosphorus removal (CEBPR) processes operated under parallel conditions, were then analyzed experimentally to assess the impact of operation in a membrane-assisted mode on the growth yield (YH), decay coefficient (bH) and maximum specific growth rate of heterotrophic biomass (µH). The resulting values for YH, bH and µH were slightly lower for the MEBPR train than for the CEBPR train, but the differences were not statistically significant. It is suggested that MEBPR simulation using ASM2 could be accomplished satisfactorily using parameter values determined for a conventional biological phosphorus removal process, if MEBPR parameter values are not available.

A metabolic model of the biological phosphorus removal process: II. Validation during start-up conditions

1995 ◽  
Vol 48 (3) ◽  
pp. 234-245 ◽  
Author(s):  
G. J. F. Smolders ◽  
D. J. Bulstra ◽  
R. Jacobs ◽  
M. C. M. van Loosdrecht ◽  
J. J. Heijnen
Keyword(s):  
Phosphorus Removal ◽  
Metabolic Model ◽  
Biological Phosphorus Removal ◽  
Removal Process ◽  
Start Up ◽  
Biological Phosphorus
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