Exploring temporal variations of oxygen saturation constants of nitrifying bacteria

Daebel, Helge; Manser, Reto; Gujer, Willi

doi:10.1016/j.watres.2006.11.011

Cited by 41 publications

(14 citation statements)

References 17 publications

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“…Some studies highlighted the differences due to the smaller size of the MBR flocs [13] such as the lower half-saturation constant for oxygen [14,15], while others pointed to the larger vulnerability to the phenomena of inhibition [16] observed in MBR activated sludge.…”

Section: Introductionmentioning

confidence: 99%

Kinetic parameters and inhibition response of ammonia‐ and nitrite‐oxidizing bacteria in membrane bioreactors and conventional activated sludge processes

Munz

Mori²,

Vannini

et al. 2010

Environmental Technology

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Ammonium and nitrite oxidizing biomasses (AOB and NOB) were investigated in parallel pilot plants: a membrane bioreactor (MBR) and a conventional activated sludge process (CASP) fed with domestic wastewater. The kinetics of AOB and NOB were monitored through titrimetric tests. The maximum specific growth rate of the AOB (micro(max,AOB)) was affected by the solids' retention time (SRT) maintained during the start up: by varying the start up SRT from 20 d to 8 d, micro(max,AOB) in the CASP varied from 0.45 d(-1) +/- 0.04 to 0.72 d(-1) +/- 0.2 respectively; the mean value of micro(max,AOB) in the MBR samples (always maintained at SRT = 20 d) was in the range 0.45-0.49 d(-1). The endogenous decay coefficients of the NOB and AOB and the maximum specific growth rates of the NOB were similar in both MBR and CASP. Inhibition tests with different concentrations of allylthiourea (ATU) were carried out on samples from both activated sludge systems: the MBR sludge exhibited higher sensitivity to a low ATU concentration; however, the maximum nitrification activity recovered more rapidly than the CASP sludge.

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Section: Introductionmentioning

confidence: 99%

Kinetic parameters and inhibition response of ammonia‐ and nitrite‐oxidizing bacteria in membrane bioreactors and conventional activated sludge processes

Munz

Mori²,

Vannini

et al. 2010

Environmental Technology

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“…In the CAS system, during a period of higher SVI and smaller floc size, at approximately 200 µm, these workers found a lower K DO,AOB value of 0.50 mg/l, or approximately 63% the value at the larger floc size. Daebel et al (2007) also compared MBR and CAS systems but found a less dramatic difference. Floc sizes in the MBR and CAS systems were approximately 30 µm for the MBR system and 100 µm for the CAS system.…”

Section: Domentioning

confidence: 99%

Accurately Modeling the Effect of Dissolved Oxygen on Nitrification

Bratby¹,

Parker²

2009

proc water environ fed

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When tasked with meeting very low nutrient limits, it is often the variable nature of the effluent ammonia that causes difficulties in meeting effluent total nitrogen goals. The specific growth rate of the nitrifying organisms is a key parameter for determining the required solids retention time and consequent reactor sizing for meeting effluent ammonia goals. One key parameter influencing the specific growth rate is the bulk dissolved oxygen (DO) in the liquid. The specific growth rate is adjusted for DO by using half saturation oxygen coefficients for both the ammonia oxidizing and the nitrite oxidizing bacteria. Because of the influence of the effects of masstransport resistance and the competition between heterotrophic and autotrophic bacteria within the activated sludge floc, operating parameters such as SRT influence the relationship between DO and nitrification rate. This study had the objective of determining the proper values of the half saturation oxygen coefficients for the Greeley WPCF, using a specific stress testing campaign and dynamic modeling using the Biowin 3 ™ simulator. It was found that the Biowin 3 ™ default values are too low, and that these parameters need to be increased for accurate predictions of effluent ammonia, nitrate and nitrite concentrations. Assignment of the proper values is essential for accurate determinations of the required operating DO concentrations, air quantities and the operating SRT. Applying the parameters found in this study to another plant showed that the adjusted parameters also provided excellent closeness of fit to measured plant data.

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“…As a result, low dissolved oxygen is used as a strategy to wash-out NOB to realize nitritation (Wang and Yang, 2004). However, some studies still reported a higher K O for AOB than NOB (Daebel et al, 2007;Manser et al, 2005;Regmi et al, 2014). In fact, very wide K O ranges of 0.03 to 1.5 mg dissolved oxygen/L and 0.13 to 3.00 mg dissolved oxygen/L were reported for AOB and NOB, respectively (Arnaldos et al, 2015;Ge et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Rittmann and McCarty (1980), at 20 8C; bBlackburne et al (2008), 20 8C; cDaebel et al (2007), 20 8C; d Manser et al (2005), 20 8C; e Guisasola et al (2005), 25 8C; f Regmi et al (2014), 25 8C; g Pérez et al (2009), 20 8C; h Moussa et al (2005), 20 8C; i Liu et al (2016), 35 8C; j Schramm et al (1999), 30 8C; k Wett et al (2013), 20 8C; l Ge et al (2015), 20 8C; m Metcalf and Eddy, (2003), 20 8C; n Van Hulle et al (2007), 35 8C; 8 Galí et al (2007), 30-35 8C; p Hellinga et al (1998), 20 8C; q Liu and Wang (2013), 20 8C; r Hunik et al (1994), 20 8C; s Park and Noguera (2007), 30 8C; t Kaelin et al (2009), 20 8C; u Kampschreur et al (2007), 20 8C; v Wett and Rauch…”

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confidence: 99%

Performance and Kinetics of Nitrification of Low Ammonia Wastewater at Low Temperature

Liu

Kim²,

Nakhla

2018

Water Environment Research

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The objective of this study was to investigate the effect of dissolved oxygen on nitrification in a sequencing batch reactor (SBR) treating low ammonia wastewater (40 mg N/L) at a low temperature (14 °C). During the 130 days of operation, three dissolved oxygen levels (5-6 mg dissolved oxygen/L, 2-3 mg dissolved oxygen/L, and 0.8-1.0 mg dissolved oxygen/L) were tested. Dissolved oxygen reduction resulted in lower ammonia oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) activity, with decreasing ammonia conversion ratio and increasing nitrite accumulation ratio. The maximum growth rates of AOB and NOB determined in this study (0.28 and 0.38 d-1) were below the median values from the literature (0.47 and 0.62 d-1), whereas the oxygen half-saturation coefficients of AOB and NOB (1.36 and 2.79 mg/L) were higher than those found in the literature. The kinetic model explained the SBR performance well. Low dissolved oxygen, together with long solids retention time, was recommended for partial nitrification at a low temperature.

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Exploring temporal variations of oxygen saturation constants of nitrifying bacteria

Cited by 41 publications

References 17 publications

Kinetic parameters and inhibition response of ammonia‐ and nitrite‐oxidizing bacteria in membrane bioreactors and conventional activated sludge processes

Kinetic parameters and inhibition response of ammonia‐ and nitrite‐oxidizing bacteria in membrane bioreactors and conventional activated sludge processes

Accurately Modeling the Effect of Dissolved Oxygen on Nitrification

Performance and Kinetics of Nitrification of Low Ammonia Wastewater at Low Temperature

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