An ORP screening protocol for biological phosphorus removal in sequencing batch reactors

1995 ◽  
Vol 22 (2) ◽  
pp. 260-269 ◽  
Author(s):  
D. G. Wareham ◽  
K. J. Hall ◽  
D. S. Mavinic
Keyword(s):  
Carbon Storage ◽  
Phosphorus Removal ◽  
Reduction Potential ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Biological Phosphorus Removal ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Screening Protocol ◽  
Biological Phosphorus

This research discusses two strategies for adding acetate to sequencing batch reactors operating as biological removal (Bio-P) systems. The control (fixed-time) reactor adds the acetate at a set time of 1 h 25 min, which is an assumed time for complete denitrification. The experimental (real-time) reactor adds the acetate when a computer detects the disappearance of nitrates, as indicated by a distinctive "breakpoint" or "kink" in the oxidation-reduction potential versus time profile. This control strategy is therefore based upon a known time for complete denitrification. The time-of-occurrence of the nitrate breakpoint is utilized in the development of a screening protocol for interpreting the behaviour (in terms of nitrate reactions) for reactors operating in biological phosphorus removal mode. The protocol involves categorizing the timing of the nitrate breakpoint into two groupings. A "failure" category corresponds to acetate being added prior to the breakpoint, because, in these cases, the acetate is used partially for denitrification and partially for Bio-P carbon storage. A "success" category corresponds to breakpoints occurring prior to the addition of acetate. In such cases, acetate is used solely for carbon storage by Bio-P organisms. Key words: oxidation-reduction potential, biological phosphorus removal, sequencing batch reactor, real-time computer control.

Performance and metabolic aspects of a novel enhanced biological phosphorus removal system with intermittent feeding and alternate aeration

2013 ◽  
Vol 69 (8) ◽  
pp. 1612-1619 ◽  
Author(s):  
Paraschos Melidis ◽  
Anastasios G. Kapagiannidis ◽  
Spyridon Ntougias ◽  
Konstantina Davididou ◽  
Alexander Aivasidis
Keyword(s):  
Phosphorus Removal ◽  
Feeding Strategy ◽  
Oxygen Demand ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Intermittent Feeding ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
On Line ◽  
Biological Phosphorus

A novel enhanced biological phosphorus removal (EBPR) system, which combined the intermittent feeding design with an anaerobic selector, was examined using on-line oxidation reduction potential (ORP), nitrate and ammonium probes. Two experimental periods were investigated: the aerobic and anoxic phases were set at 40 and 20 minutes respectively for period I, and set at 30 and 30 minutes for period II. Chemical oxygen demand (COD), biochemical oxygen demand (BOD5) and P removal were measured as high as 87%, 96% and 93% respectively, while total Kjeldahl nitrogen (TKN) and NH4+ removal averaged 85% and 91%. Two specific denitrification rates (SDNRs), which corresponded to the consumption of the readily biodegradable and slowly biodegradable COD, were determined. SDNR-1 and SDNR-2 during period I were 0.235 and 0.059 g N g−1 volatile suspended solids (VSS) d−1 respectively, while the respective rates during period II were 0.105 and 0.042 g N g−1 VSS d−1. The specific nitrate formation and ammonium oxidizing rates were 0.076 and 0.064 g N g−1 VSS d−1 for period I and 0.065 and 0.081 g N g−1 VSS d−1 for period II respectively. The specific P release rates were 2.79 and 4.02 mg P g−1 VSS h−1 during period I and II, while the respective anoxic/aerobic uptake rates were 0.42 and 0.55 mg P g−1 VSS h−1. This is the first report on an EBPR scheme using the intermittent feeding strategy.

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.

Role of extracellular exopolymers in biological phosphorus removal

2006 ◽  
Vol 54 (8) ◽  
pp. 257-265 ◽  
Author(s):  
Y. Liu ◽  
S. Yu ◽  
G. Xue ◽  
F. Zhao
Keyword(s):  
Phosphorus Removal ◽  
Energy Dispersive Spectrometry ◽  
Phosphorus Content ◽  
Carbon Sources ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Biological Phosphorus Removal ◽  
Key Factor ◽  
Biological Phosphorus

Three sequencing batch reactors (SBRs) supplied with different carbon sources were investigated. The system supplied with glucose gained the best enhanced biological phosphorus removal (EBPR), although all of them were seeded from the same sludge. With the measurement of poly-β-hydroxyalkanoate (PHA) concentration, phosphorus content in sludge and extracellular exopolymers (EPs) with scanning electron microscopy (SEM) combined with energy dispersive spectrometry (EDS), it was found that the biosorption effect of EPs played an important role in phosphorus removal and that the amount of PHA at the end of anaerobic phase was not the only key factor to determine the following phosphorus removal efficiency.

Bioaugmentation of sequencing batch reactors for biological phosphorus removal: comparative rRNA sequence analysis and hybridization with oligonucleotide probes

1998 ◽  
Vol 37 (4-5) ◽  
pp. 469-473 ◽  
Author(s):  
Daniel B. Oerther ◽  
James Danalewich ◽  
Ebru Dulekgurgen ◽  
Eric Leveque ◽  
David L. Freedman ◽  
...  
Keyword(s):  
Phosphorus Removal ◽  
Laboratory Scale ◽  
Batch Reactors ◽  
Oligonucleotide Probes ◽  
Sequencing Batch Reactors ◽  
Biological Phosphorus Removal ◽  
Start Up ◽  
Pure Cultures ◽  
Acinetobacter Spp ◽  
Biological Phosphorus

Four laboratory-scale sequencing batch reactors (SBRs) were operated to evaluate whether bioaugmentation with Acinetobacter spp. can be used to improve start-up and performance of enhanced biological phosphorus removal (EBPR) systems. Two of the SBRs were bioaugmented during start-up by adding pure cultures of Acinetobacter spp., the third reactor received an amendment of activated sludge from a laboratory-scale EBPR system, and the fourth reactor, receiving no amendment, served as a control. Various chemical parameters were measured to monitor the performance of the four SBRS. Oligonucleotide probes of nested phylogenetic specificity were designed to quantify the contribution of Acinetobacter to EBPR. The probes were characterized for use in quantitative membrane hybridizations and fluorescent in situ hybridizations. Data from hybridizations with samples collected from the SBRs show declining levels of Acinetobacter spp. over the experiment. All four reactors achieved significant phosphorus removal and 90% nitrification after three days of operation. The results do not show a positive correlation between levels of Acinetobacter and successful EBPR.

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