Kinetics of Nitrobacter agilis at extreme substrate, product and salt concentrations

Hunik, J.H.; Meijer, H.J.G.; Tramper, J.

doi:10.1007/bf00170408

Cited by 60 publications

(35 citation statements)

References 28 publications

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“…The parameters of the model are therefore considered to be one kind of microorganism. Hunik et al [31,32] reported that when the microorganism metabolized the inorganic compounds, such as NO 2 , NH 3 , NO 2 − , and so forth, the reaction is a zero-order reaction, with its half-saturation coefficient between 0.1 and 1.0 mg L −1 . Catton et al [33] shared the same opinion and reported that the removal efficiency would not be influenced by the increasing NO concentration at low concentrations (<600 mg m −3 ), with mass transfer being the key limiting factor.…”

Section: Dynamic Model Of No Transfer-biodegrationmentioning

confidence: 99%

Dynamic model for nitric oxide removal by a rotating drum biofilter

Jiang

Chen

Sha

et al. 2009

Journal of Hazardous Materials

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Section: Dynamic Model Of No Transfer-biodegrationmentioning

confidence: 99%

Dynamic model for nitric oxide removal by a rotating drum biofilter

Jiang

Chen

Sha

et al. 2009

Journal of Hazardous Materials

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“…The total nitrogen content of the compost on day 92 was 4.02 g N/kg (see Table 1). According to Hunik et al, 37,38 no NH 4 + inhibition is to be expected for Nitrosomonas europaea and Nitrobacter agilis in concentrated NH 3 -loaded waste streams at 6.5 < pH < 8.5, while also NO 2 -and NO 3 -inhibition is not to be expected at pH ≥ 8.5. However, an inhibition of the activity of N. europaea was observed at high salt concentrations (200-500 mmol/L), because of osmotic pressure.…”

Section: Experiments Ii: Biofiltration Of Ch 3 Ohmentioning

confidence: 99%

Regeneration of a Compost Biofilter Degrading High Loads of Ammonia by Addition of Gaseous Methanol

Demeestere

Langenhove

Smet

2002

Journal of the Air & Waste Management Association

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The long-term stability of a biofilter loaded with waste gases containing NH 3 concentrations larger than 100 ppmv was studied in a laboratory-scale compost reactor. At an empty bed residence time (τ) of 21 sec, elimination capacities of more than 300 g NH 3 /m 3 /day were obtained at elimination efficiencies up to 87%. Because of absorption and nitrification, almost 80% of the NH 3 -N eliminated from the waste gas could be recovered in the compost as NH 4The high elimination capacities could be maintained as long as the NH 4 + / NO x -concentration in the carrier material was less than 4 g NH 4 + /NO x --N/kg wet compost. Above this critical value, osmotic effects inhibited the nitrifying activity, and the elimination capacity for NH 3 decreased. To restore the biofilter performance, a carbon source (methanol) was added to reduce NH 4 + /NO x -accumulated in the compost. Results indicate that methylotrophic microorganisms did convert NH 4 + /NO x -into biomass, as long as the NO 3 -content in the compost was larger than 0.1 g NO 3 --N/kg compost. Removal efficiencies of CH 3 OH of more than 90% were obtained at volumetric loads up to 11,000 g CH 3 OH/ m 3 /day. It is shown that addition of CH 3 OH is a suitable technique for regenerating the compost material from osmotic inhibition as a result of high NH 3 loading. The biofilter was operated for 4 months with alternating loading of NH 3 and CH 3 OH.

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“…The one constant was that nitrous oxide production was coincidental with nitrite accumulation in every case studied. Hunik et al, (1993) had previously demonstrated that free ammonia was unlikely to be inhibitory to pure cultures of Nitrobacter agilis. Recent research has indicated the primary nitrite-oxidizers in wastewater systems are Nitrospira and not Nitrobacter and this was certainly the case for the reactors operated for this research program.…”

Section: Discussionmentioning

confidence: 99%

Development of a Conceptual Model to Explain Apparent Free Ammonia Inhibition in Wastewater Systems (WEFTEC 2006)

Simm¹,

Mavinic²,

Ramey³

2006

proc water environ fed

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The common consensus among researchers and practitioners alike is that high free ammonia concentrations cause nitrite oxidizer inhibition in wastewater treatment systems. The work of Anthonisen et al. (1976), who produced an operational chart providing guidance on the free ammonia concentrations most likely to produce nitrite oxidizer inhibition, is considered by many to be the definitive work that established the inhibitory nature of free ammonia in wastewater treatment systems. Over the past three decades several investigators have reported discrepancies in the range of inhibitory free ammonia concentrations. Anthonisen et al. (1976) reported inhibition of nitrite-oxidizers at free ammonia concentrations of 0.1 to 1 mg/L, Turk and Mavinic (1986) reported no significant nitrite-oxidizer inhibition for free ammonia concentrations below 10 mg NH 3 -N/L, whereas Mauret et al. (1996) concluded that free ammonia inhibits Nitrobacter, in the range of 6.6 to 8.9 mg NH 3 -N/L. On the other hand, Gieseke et al. (2003) state that it is not known whether bacteria of the genus Nitrospira, now believed to be the most prevalent nitrite oxidizer in wastewater systems, are inhibited by free ammonia.Some investigators have called into question the true cause of observed nitrite oxidizer inhibition. For example, Cecen and Ipek (1998) suggested that the dissolved oxygen to free ammonia ratio and not the free ammonia concentration itself is important, when attempting to induce nitrite accumulation. The work of others (Stuven et al. 1992;Yang and Alleman 1992;and Hyungseok Yoo et al. 1999) has suggested that hydroxylamine -an intermediate in the ammonia oxidation process -may be the true cause of nitrite oxidizer inhibition and therefore of nitrite accumulation. Many authors agree; however, that selective inhibition of nitrite oxidation via apparent free ammonia inhibition would allow direct oxidation of ammonia to nitrite and denitrification to dinitrogen gas with the inherent benefits of reduced aeration and carbon requirements. The starting point to designing such a process is the development of a clearer understanding of the mechanism(s) associated with nitrite oxidizer inhibition and nitrite accumulation. This paper describes the results of exploratory work conducted to both confirm the results of mixed culture batch tests suggesting free ammonia may not be inhibitory to nitrite oxidizers as commonly reported and elucidate the likely mechanism(s) responsible for observed phenomenon. Free ammonia inhibition trials were undertaken using pure cultures of Nitrospira moscoviensis, since Nitrospira spp. were the predominant nitrite-oxidizers in the systems studied for this research program. The results of these experiments support the conclusion that free ammonia is probably not inhibitory to nitrite-oxidizing organisms in wastewater systems. 6548 WEFTEC®.06Copyright 2006 Water Environment Foundation. All Rights Reserved © Several long-term reactor perturbation studies were conducted with mixed microbial cultures to identi...

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Kinetics of Nitrobacter agilis at extreme substrate, product and salt concentrations

Cited by 60 publications

References 28 publications

Dynamic model for nitric oxide removal by a rotating drum biofilter

Dynamic model for nitric oxide removal by a rotating drum biofilter

Regeneration of a Compost Biofilter Degrading High Loads of Ammonia by Addition of Gaseous Methanol

Development of a Conceptual Model to Explain Apparent Free Ammonia Inhibition in Wastewater Systems (WEFTEC 2006)

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