Enhanced ammonia removal at room temperature by pH controlled partial nitrification and subsequent anaerobic ammonium oxidation

Duran, Unicamp Nelson; Río, Ángeles Val del; Campos, José Luis; Mosquera-Corral, Anuska; Méndez, R.

doi:10.1080/09593330.2013.829110

Cited by 32 publications

(7 citation statements)

References 23 publications

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“…Durán et al [27] also observed that the FNA caused the suppression of NOB from a reactor where the partial nitritation took place at 20 ºC and 400 mg NH4 + -N/L. They based the operation of this system on the control of the NH4 + -N/IC ratio, which was maintained at values of approximately 0.82 g N/g C, close to the values used in the present study.…”

Section: Influence Of the Inlet Ammonium To Inorganic Carbon Ratio (Nsupporting

confidence: 84%

Nitrite oxidizing bacteria suppression based on in-situ free nitrous acid production at mainstream conditions

Pedrouso

Morales²,

Vázquez-Padín³

et al. 2017

Separation and Purification Technology

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The application of autotrophic nitrogen removal processes in the main line of wastewater treatment plants will contribute to achieve its self-energy-sufficiency. However, the effective suppression of nitrite oxidizing bacteria (NOB) activity at the conditions of low temperature and low ammonium concentration (mainstream conditions) was identified as one of the main bottlenecks. In this study, stable partial nitritation at 16 ºC and 50 mg NH4 + -N/L was achieved maintaining inside the reactor free nitrous acid (FNA) concentrations inhibitory for NOB (> 0.02 mg HNO2-N/L), without dissolved oxygen concentration control. The FNA inhibitory concentration was generated by the partial nitritation process, and its stimulation was studied with two different inhibitors: sodium azide and nitrite. The microbiological analysis revealed that, throughout the operational period with inhibitory FNA levels, the NOB populations (dominated by Nitrospira) were effectively washed out from the reactor. This is an advantage that allowed maintaining a good stability of the process, even when the FNA concentration was not enough to inhibit the NOB, taking about 40 days to develop significant activity. The observed delay on the NOB development is expected to enable the establishment of corrective actions to avoid the partial nitritation destabilization. The use of the FNA to achieve a stable partial nitritation process is recommended to profit from the natural pH decrease associated to the nitritation process and from its favoured accumulation at low temperatures as those from the mainstream. In this research study an analysis about the influence of ammonium and alkalinity concentrations was also performed to know in which scenarios the FNA inhibitory concentration can be achieved.

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Section: Influence Of the Inlet Ammonium To Inorganic Carbon Ratio (Nsupporting

confidence: 84%

Nitrite oxidizing bacteria suppression based on in-situ free nitrous acid production at mainstream conditions

Pedrouso

Morales²,

Vázquez-Padín³

et al. 2017

Separation and Purification Technology

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“…Nitrification rates are inhibited when soil pH drops below 6.0 [49,50]. With pH values of the forest soil (4.7) and the agricultural soil (6.5), the original N2O production in the soils potentially were not attributable to microbial nitrification [51][52][53]. It has been observed that fungi produced N2O instead of N2 through codenitrification in the presence of other nitrogen compounds, such as azide, salicylhydroxamic acid, nitrite and ammonium [54,55].…”

Section: Discussionmentioning

confidence: 99%

Assessing Microbial Contributions to N2O Impacts Following Biochar Additions

et al. 2014

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Varying degrees of soil nitrous oxide (N2O) mitigation have been observed following biochar applications. Laboratory incubation experiments were conducted using soils from agriculture, forest, prairie, and a sterilized sand to examine the relative contributions of bacteria and fungi to this N2O alteration. Selective chemical inhibitors were used to distinguish the relative contributions of fungal and bacterial groups to N2O production/suppression in each soil type following a fast-pyrolysis macadamia nut shell biochar (10% w/w) addition. Overall, suppressed production of N2O was initially observed between the agricultural and prairie soils following biochar addition and stimulation of N2O production was observed in the biochar amended forest soil. However, if the N2O production that was observed in the biochar control (sterile sand and biochar = 4.2 ± 0.7 ng-N g −1 day −1) was subtracted from all treatments, N2O production following biochar addition was consistently lower in all soils following biochar additions. In terms of the microbial OPEN ACCESS Agronomy 2014, 4 479 contributions, there were no significant differences in N2O production between the microbial inhibitor treatments, despite CO2 production rate differences. Therefore, the response in the N2O production to biochar could not be directly attributed to a particular microbial group (fungi or bacteria). These results suggest the presence of abiotic production or consumption routes for nitrogen species in biochar amended soils.

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“…Durán et al [68] showed the potential for partial nitrification at low temperature by controlling the aeration frequency, pH value [69] and DO concentration [70] or by adding hydroxylamine to inhibit the activity of NOB.…”

Section: Ph and Temperaturementioning

confidence: 99%

Application of the Anammox in China—A Review

Wen

Jin

Zhang

2020

IJERPH

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Anaerobic ammonia oxidation (anammox) has been one of the most innovative discoveries for the treatment of wastewater with high ammonia nitrogen concentrations. The process has significant advantages for energy saving and sludge reduction, also capital costs and greenhouse gases emissions are reduced. Recently, the use of anammox has rapidly become mainstream in China. This study reviews the engineering applications of the anammox process in China, including various anammox-based technologies, selection of anammox reactors and attempts to apply them to different wastewater treatment plants. This review discusses the control and implementation of stable reactor operation and analyzes challenges facing mainstream anammox applications. Finally, a unique and novel perspective on the development and application of anammox in China is presented.

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Enhanced ammonia removal at room temperature by pH controlled partial nitrification and subsequent anaerobic ammonium oxidation

Cited by 32 publications

References 23 publications

Nitrite oxidizing bacteria suppression based on in-situ free nitrous acid production at mainstream conditions

Nitrite oxidizing bacteria suppression based on in-situ free nitrous acid production at mainstream conditions

Assessing Microbial Contributions to N2O Impacts Following Biochar Additions

Application of the Anammox in China—A Review

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