Temperature, cyanide and phenolic nitrification inhibition

Neufeld, Ronald D.; Greenfield, J. R.; Rieder, B.

doi:10.1016/0043-1354(86)90028-x

Cited by 76 publications

(38 citation statements)

References 7 publications

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“…The experiments show that cyanide is extremely toxic to N. europaea, consistent with reports in the literature. It is known that levels of free cyanide above 4.23 mM (Neufeld et al, 1986) and 7.69 mM (Kim et al, 2007) can inhibit nitrification in activated sludge.…”

Section: Resultsmentioning

confidence: 99%

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Whole‐genome transcriptional and physiological responses of Nitrosomonas europaea to cyanide: Identification of cyanide stress response genes

Park

Ely

2008

Biotech & Bioengineering

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Nitrosomonas europaea (ATCC 19718) is one of several nitrifying species that participate in the biological removal of nitrogen from wastewater by oxidizing ammonia to nitrite, the first step in nitrification. Because nitrification is quite sensitive to cyanide, a compound often encountered in wastewater treatment plants, we characterized the physiological and transcriptional responses of N. europaea cells to cyanide. The cells were extremely sensitive to low concentrations of cyanide, with NO-(2)production and ammonia-dependent oxygen uptake rates decreasing by 50% within 30 min of exposure to 1 microM NaCN. Whole-genome transcriptional responses of cells exposed to 1 microM NaCN were examined using Affymetrix microarrays to identify stress-induced genes. The transcript levels of 35 genes increased more than 2-fold while transcript levels of 29 genes decreased more than 20-fold. A gene cluster that included moeZ (NE2353), encoding a rhodanese homologue and thought to be involved in detoxification of cyanide, showed the highest up-regulation (7-fold). The down-regulated genes included genes encoding proteins involved in the sulfate reduction pathway, signal transduction mechanisms, carbohydrate transport, energy production, coenzyme metabolism, and amino acid transport.

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Section: Resultsmentioning

confidence: 99%

“…Cyanide is known as an inhibitor of respiratory processes in nitrification (Neufeld et al, 1986). Specifically, a single molecule of cyanide bound to heme P460 of HAO inhibited HAO activity in N. europaea (Logan et al, 1995).…”

Section: Up-regulation Of Moez Amo and Hao Genesmentioning

confidence: 99%

Whole‐genome transcriptional and physiological responses of Nitrosomonas europaea to cyanide: Identification of cyanide stress response genes

Park

Ely

2008

Biotech & Bioengineering

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“…When the loading was above 0.07 kg (TOC)/m 3 h, the nitrification process was completely inhibited (Zhang et al 2000). Organic compounds such as aniline, ortho-cresol, and phenol have stronger inhibition influences on NOB than on AOB, so biological wastewater treatment with these organics might cause nitrite accumulation phenomenon (Neufeld et al 1986) to occur. Oxidants such as chlorite and chlorate have inhibition effect on NOB.…”

Section: Inhibitormentioning

confidence: 99%

Biological nitrogen removal with nitrification and denitrification via nitrite pathway

Peng

Zhu

2006

Appl Microbiol Biotechnol

525

230

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Presently, the wastewater treatment practices can be significantly improved through the introduction of new microbial treatment technologies. To meet increasingly stringent discharge standards, new applications and control strategies for the sustainable removal of ammonium from wastewater have to be implemented. Partial nitrification to nitrite was reported to be technically feasible and economically favorable, especially when wastewater with high ammonium concentrations or low C/N ratios is treated. For successful implementation of the technology, the critical point is how to maintain partial nitrification of ammonium to nitrite. Partial nitrification can be obtained by selectively inhibiting nitrite oxidizing bacteria through appropriate regulation of the system's DO concentration, microbial SRT, pH, temperature, substrate concentration and load, operational and aeration pattern, and inhibitor. The review addressed the microbiology, its consequences for their application, the current status regarding application, and the future developments.

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“…AOB are highly sensitive to many environmental factors such as pH, temperature, and dissolved oxygen (DO) concentration [28,29,31]. Growth of AOB is also affected by industrial contaminants, including cyanide [3,11,16,17].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous effect of temperature, cyanide and ammonia-oxidizing bacteria concentrations on ammonia oxidation

Lim

Shin

et al. 2008

J Ind Microbiol Biotechnol

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For biological nitrification, a set of experiments were carried out to approximate the response of lag period along with ammonia oxidation rate with respect to different concentrations of cyanide (CN-) and ammonia-oxidizing bacteria (AOB), and temperature variation in laboratory-scale batch reactors. The effects of simultaneous changes in these three factors on ammonia oxidation were quantitatively estimated and modeled using response surface analysis. The lag period and the ammonia oxidation rate responded differently to changes in the three factors. The lag period and the ammonia oxidation rate were significantly affected by the CN- and AOB concentrations, while temperature changes only affected the ammonia oxidation rate. The increase of AOB concentration and temperature alleviated the inhibition effect of cyanide on ammonia oxidation. The statistical method used in this study can be extended to estimate the quantitative effects of other environmental factors that can change simultaneously.

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Temperature, cyanide and phenolic nitrification inhibition

Cited by 76 publications

References 7 publications

Whole‐genome transcriptional and physiological responses of Nitrosomonas europaea to cyanide: Identification of cyanide stress response genes

Whole‐genome transcriptional and physiological responses of Nitrosomonas europaea to cyanide: Identification of cyanide stress response genes

Biological nitrogen removal with nitrification and denitrification via nitrite pathway

Simultaneous effect of temperature, cyanide and ammonia-oxidizing bacteria concentrations on ammonia oxidation

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