Nitrification and denitrification processes for mitigation of nitrous oxide from waste water treatment plants for biovalorization: Challenges and opportunities

Thakur, Indu Shekhar; Medhi, Kristina

doi:10.1016/j.biortech.2019.03.069

Cited by 133 publications

(46 citation statements)

References 95 publications

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“…The denitrifiers accounted for 40.2% and 37.6% in the anoxic environment (B9 and B5), while the percentages of them in the aerobic environment were lower (B1 of 32.8% and B10 of 32.9%). To our knowledge, the genera of Acinetobacter, Pseudomonas, Rhodococcus, Paracoccus, Bacillus, Mesorhizobium, Stenotrophomonas, Halomonas, Thauera, Enterobacter were important denitrifiers possessing abilities of heterotrophic nitrification and aerobic denitrification (HN-AD) as previous reports (Lu et al, 2008;Thakur and Medhi, 2019). Interestingly, most of the HN-AD bacteria were detected with higher relative abundance in the aerobic conditions (B1 and B10).…”

Section: Functional Bacteria Of the Snad Bioreactorsupporting

confidence: 61%

Nitrogen removal in recirculating aquaculture water with high dissolved oxygen conditions using the simultaneous partial nitrification, anammox and denitrification system

Lü

Zhang

et al. 2020

Bioresource Technology

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The efficient removal of nitrogen pollutants in the aquaculture systems is still a challenge due to the low concentration of organic carbon and high concentration of dissolved oxygen (DO) in the wastewater. The simultaneous partial nitrification, anammox and denitrification (SNAD) bioreactor was firstly used for the treatment of aquaculture wastewater in recirculating aquaculture system. The bioreactor operated for 180 days without adding extra organic carbon. After 60-day operation, the bioreactor reached the stable stage with the average concentration of ammonia/nitrate/nitrite/COD in the effluent with 0.26/0.75/0.47/0.27 mg/L. The Pseudoxanthomonas was the dominant genus in the biofilm samples. The typical nitrogen functional bacteria and genes for nitrification, anammox and denitrification were detected with different abundance in different procedures along the bioreactor. Network analysis revealed the significant correlations between nitrogen functional bacteria and genes. The SNAD bioreactor achieved the effective removal for nitrogen and COD under high DO conditions in recirculating aquaculture system.

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Section: Functional Bacteria Of the Snad Bioreactorsupporting

confidence: 61%

Nitrogen removal in recirculating aquaculture water with high dissolved oxygen conditions using the simultaneous partial nitrification, anammox and denitrification system

Lü

Zhang

et al. 2020

Bioresource Technology

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“…Theoretically, CH 4 emissions from anaerobic processes can occur in a drain field ( Somlai et al., 2019 ). As for N 2 O generation, low DO soil layers can lead to hydroxylamine oxidation by AOB and nitrifier denitrification over NO 2 by AOB ( Thakur and Medhi, 2019 ). Limited organic substrate supplies can also result in incomplete denitrification by heterotrophs ( Thakur and Medhi, 2019 ).…”

Section: Resultsmentioning

confidence: 99%

“…As for N 2 O generation, low DO soil layers can lead to hydroxylamine oxidation by AOB and nitrifier denitrification over NO 2 by AOB ( Thakur and Medhi, 2019 ). Limited organic substrate supplies can also result in incomplete denitrification by heterotrophs ( Thakur and Medhi, 2019 ). Repetitive wastewater application can cause wet-dry cycles in soil layers which alternatively stimulate CH 4 and N 2 O emissions, and similar observations have also been made on sludge field application sites.…”

Section: Resultsmentioning

confidence: 99%

Numerical assessment of a soil moisture controlled wastewater SDI disposal system in Alabama Black Belt Prairie

Dougherty

Chen

2021

Chemosphere

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To promote the environmental sustainability of rural sanitation, a soil moisture controlled wastewater subsurface drip irrigation (SDI) dispersal system was field tested in the Black Belt Prairie of Alabama, USA. The soil moisture control strategy was designed to regulate wastewater disposal timing according to drain field conditions to prevent hydraulic overloading and corresponding environmental hazard. CW2D/HYDRUS simulation modeling was utilized to explore difficult-to-measure aspects of system performance. While the control system successfully adapted hydraulic loading rate to changing drain field conditions, saturated field conditions during the dormant season presented practical application challenges. The paired field experiment and simulation model demonstrate that soil biofilm growth was stimulated in the vicinity of drip emitters. Although biofilm growth is critical in maintaining adequate COD and removal efficiencies, the efficient removal of biodegradable COD itself by soil biofilm limits denitrification of formed . Furthermore, stimulated soil biofilm growth can create soil clogging around drip emitters, which was discerned in the field experiment along with salt accumulation, both of which were verified by simulation. Comparable modeling of system performance in sand and clay media demonstrate that the placement of soil moisture sensors within the drain field can have pronounced impacts on system hydraulic performance, depending on the soil permeability. Overall, the soil moisture control strategy tested is shown as a viable supplemental technology to promote the environmental sustainability of rural sanitation systems.

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“…Heterotrophic denitrifying bacteria produced large amounts of N 2 O, and the released N 2 O was somewhat controllable. The initial insufficient carbon source and the simultaneous denitrification under aerobic conditions are the two main reasons for heterotrophic denitrifying bacteria to release N 2 O into the atmosphere . Thus N 2 O produced by the A/O/A mode in this study was less than that produced by the A/O mode.…”

Section: Resultsmentioning

confidence: 99%

Characteristics of nitrous oxide production under salt stress: a model study

Dai

Zhao

Nasry

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: A large amount of N 2 O is often generated in the high-salt wastewater nitrogen removal process, which is unfavorable to the environment, so it is necessary to build a model to describe the N 2 O production characteristics in high-salt environment.RESULTS: This work merges three nitrous oxide (N 2 O) production pathways, namely ammonium-oxidizing bacteria (AOB) denitrification, incomplete hydroxylamine (NH 2 OH) oxidation and heterotrophic denitrification, into a multispecies activated sludge model to describe N 2 O production under salt stress for the first time. The heterotrophic denitrification pathway was divided into two parts, namely denitrification on intracellular polymers and denitrification on endogenous respiration, and high-salt inhibition terms were added to the intracellular polymer expressions on the heterotrophic denitrification pathway. The developed model was calibrated by a cycle running experimental case and validated by three single experimental cases, then assessed by two different sets of experimental data. The results indicated that the model reproduced experimentally measured data from six cases perfectly. The modeling results showed that the heterotrophic denitrification pathway (70.04-81.52%) played a significant role in N 2 O production, while smaller amounts of N 2 O were generated by the AOB denitrification pathway (14.53-23.93%) and incomplete NH 2 OH oxidation pathway (3.54-7.75%).CONCLUSION: Denitrification on endogenous respiration will produce a small amount of N 2 O with an initial carbon source; when there is no initial carbon source, it will be dominant. Owing to the competitive effects of heterotrophic denitrifying bacterial nitrogen reductase on electron donors, N 2 O conversion (ratio of N 2 O production to total nitrogen removal) will increase with decreasing carbon source.

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Nitrification and denitrification processes for mitigation of nitrous oxide from waste water treatment plants for biovalorization: Challenges and opportunities

Cited by 133 publications

References 95 publications

Nitrogen removal in recirculating aquaculture water with high dissolved oxygen conditions using the simultaneous partial nitrification, anammox and denitrification system

Nitrogen removal in recirculating aquaculture water with high dissolved oxygen conditions using the simultaneous partial nitrification, anammox and denitrification system

Numerical assessment of a soil moisture controlled wastewater SDI disposal system in Alabama Black Belt Prairie

Characteristics of nitrous oxide production under salt stress: a model study

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