A comparison of bacterial populations in enhanced biological phosphorus removal processes using membrane filtration or gravity sedimentation for solids–liquid separation

Hall, Eric R.; Monti, Alessandro; Mohn, William W.

doi:10.1016/j.watres.2010.01.024

Cited by 27 publications

(12 citation statements)

References 36 publications

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“…To promote their activity as PAOs, the key is to impose appropriate operational conditions (normally involving an anaerobic zone); however, it is also possible that PAOs take advantage of anaerobic micro-niches occurring in non-EBPR plants. The high MLSS and EPS concentrations typical in MBRs (Judd 2008;Hall et al 2010) might indeed facilitate the occurrence of these micro-niches, which could justify the good biological P removal observed in MBR 3. In such a situation, it is possible that a higher number of putative PAOs are required to achieve good P removal performance as compared to a traditional EBPR-designed WWTP.…”

Section: Discussionmentioning

confidence: 98%

“…MBRs seem to select a more stable microbial community as compared to CAS systems, where higher dynamics were observed (Hall et al 2010;Wan et al 2011). Moreover, a large set of novel and uncultured bacterial sequences have been found in an MBR (Wan et al 2011), which reflects the lack of knowledge concerning MBR microbial populations.…”

Section: Introductionmentioning

confidence: 98%

“…A few studies have compared the microbial community between MBR and CAS operated in parallel, and all revealed significant differences between the overall community structures (Luxmy et al 2000;Hall et al 2010;Wan et al 2011). MBRs seem to select a more stable microbial community as compared to CAS systems, where higher dynamics were observed (Hall et al 2010;Wan et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…MBRs present a potentially suitable environment for PAO proliferation. PAOs grow slower than ordinary heterotrophic organisms (Smolders et al 1994), thus being favored in MBRs due to complete biomass retention (Hall et al 2010). Additionally, the high biomass concentrations normally found in MBRs might lead to areas of anaerobic micro-niches within the sludge flocs in poorly mixed zones, potentially providing PAOs a selective advantage.…”

Section: Introductionmentioning

confidence: 99%

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Microbial population analysis of nutrient removal-related organisms in membrane bioreactors

Silva

Carvalho

Oehmen

et al. 2011

Appl Microbiol Biotechnol

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Membrane bioreactors (MBR) are an important and increasingly implemented wastewater treatment technology, which are operated at low food to microorganism ratios (F/M) and retain slow-growing organisms. Enhanced biological phosphorus removal (EBPR)-related organisms grow slower than ordinary heterotrophs, but have never been studied in detail in MBRs. This study presents a comprehensive analysis of the microorganisms involved in EBPR in pilot-and full-scale MBRs, using fluorescence in situ hybridization (FISH), as well as an overall assessment of other relevant microbial groups. The results showed that polyphosphate accumulating organisms (PAOs) were present at similar levels in all studied MBRs (10%±6%), even those without a defined anaerobic zone. Glycogen accumulating organisms were also detected, although rarely. The FISH results correlated well with the observed P removal performance of each plant. The results from this study suggest that a defined anaerobic zone is not necessarily required for putative PAO growth in MBRs, since polyphosphate storage may provide a selective advantage in fulfilling cell maintenance requirements in substrate-limited conditions (low F/M).

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microbial population analysis of nutrient removal-related organisms in membrane bioreactors

Silva

Carvalho

Oehmen

et al. 2011

Appl Microbiol Biotechnol

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“…In recent years, various methods have been investigated to remove or recover phosphorus from wastewater, such as chemical precipitation [6], adsorption [7,8], ion exchange [9], electrocoagulation [10], and membrane filtration [11]. Among these methods, chemical precipitation is difficult to be used to treat high concentration of phosphorus.…”

Section: Introductionmentioning

confidence: 99%

The Internal Recycle Reactor Enhances Porous Calcium Silicate Hydrates to Recover Phosphorus from Aqueous Solutions

Guan

Tian

2017

Journal of Chemistry

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In this experiment, the porous calcium silicate hydrates (P-CSHs) were prepared via a hydrothermal method and then modified by polyethylene glycol (PEG). The modified P-CSHs combined with an internal recycle reactor could successfully recover the phosphorus from electroplating wastewater. The modified P-CSHs were characterized by X-ray diffraction (XRD), N 2 adsorptiondesorption isotherms, and Fourier transform infrared spectroscopy (FT-IR). After compared with different samples, the modified P-CSHs-PEG2000 sample had larger specific surface area of 87.48 m 2 /g and higher pore volume of 0.33 cm 3 /g, indicating a high capacity for phosphorus recovery. In the process of phosphorus recovery, the pH value of solution was increased to 9.5, which would enhance the recovery efficiency of phosphorus. The dissolution rate of Ca 2+ from P-CSH-PEG2000 was fast, which was favorable for phosphorus precipitation and phosphorus recovery. The effects of initial concentration of phosphorus, P-CSHs-PEG2000 dosage, and stirring speed on phosphorus recovery were analyzed, so the optimal operation conditions for phosphorus recovery were obtained. The deposition was analyzed by XRD, N 2 adsorption-desorption, and SEM techniques; it was indicated that the pore volume and surface area of the P-CSHs-PEG2000 were significantly reduced, and the deposition on the surface of P-CSHs-PEG2000 was hydroxyapatite.

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Application of Minihydrocyclones in Methanol‐to‐Olefin Process Wastewater Treatment

Yang

et al. 2015

Chem Eng & Technol

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A significant amount of wastewater containing fine catalyst particles is produced in the methanol-to-olefin (MTO) process, which restricts the long-period operation of the processing unit. To address this key problem, a minihydrocyclone was designed for MTO wastewater treatment and tested in the laboratory. Good separation performance and a small cut diameter were achieved under certain feed conditions. Furthermore, a group composed of 300 parallel-arranged minihydrocyclones was applied to the industrial unit in the MTO quench water treatment. The obtained results indicated that the separation efficiency and precision of the minihydrocyclone can meet the requirements of fine catalyst particle separation, and the designed minihydrocyclone group with reasonable parallel configuration exerted an outstanding application effect on the treatment of MTO quench water.

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A comparison of bacterial populations in enhanced biological phosphorus removal processes using membrane filtration or gravity sedimentation for solids–liquid separation

Cited by 27 publications

References 36 publications

Microbial population analysis of nutrient removal-related organisms in membrane bioreactors

Microbial population analysis of nutrient removal-related organisms in membrane bioreactors

The Internal Recycle Reactor Enhances Porous Calcium Silicate Hydrates to Recover Phosphorus from Aqueous Solutions

Application of Minihydrocyclones in Methanol‐to‐Olefin Process Wastewater Treatment

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