Nitrite inhibition of microalgae induced by the competition between microalgae and nitrifying bacteria

González-Camejo, J.; Castillo, Piedad Margarita Montero; Aparicio, S.; Ruano, M.V.; Borrás, L.; Seco, A.; Barat, R.

doi:10.1016/j.watres.2020.115499

Cited by 66 publications

(27 citation statements)

References 33 publications

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“…Different interactions occur between microalgae and nitrifiers in terms of N-NH 4 + availability. These interactions are not yet fully understood and contradictory results have been reported [11,12]. Thus, further studies are needed to identify how the utilisation of microalgae affects the bacterial community that appears naturally in PWW and, therefore, the efficiency of the integrated process.…”

Section: Introductionmentioning

confidence: 99%

Role of Microalgae in the Recovery of Nutrients from Pig Manure

et al. 2021

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Animal production inevitably causes the emission of greenhouse gases and the generation of large amounts of slurry, both representing a serious environmental problem. Photosynthetic microorganisms such as microalgae and cyanobacteria have been proposed as alternative strategies to bioremediate agricultural waste while consuming carbon dioxide and producing valuable biomass. The current study assessed the potential of the microalga Scenedesmus sp. to remove nutrients from piggery wastewater (PWW) and the influence of the microalga on the microbial consortia. Maximum N-NH4+ consumption was 55.3 ± 3.7 mg·L−1·day−1 while P-PO43− removal rates were in the range 0.1–1.9 mg·L−1·day−1. N-NH4+ removal was partially caused by the action of nitrifying bacteria, which led to the production of N-NO3−. N-NO3− production values where lower when microalgae were more active. This work demonstrated that the photosynthetic activity of microalgae allows us to increase nutrient removal rates from PWW and to reduce the coliform bacterial load of the effluent, minimising both their environmental impact and health risks. Microalgae assimilated part of the N-NH4+ present in the media to produce biomass and did not to convert it into N-NO3− as in traditional processes.

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Section: Introductionmentioning

confidence: 99%

Role of Microalgae in the Recovery of Nutrients from Pig Manure

et al. 2021

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“…The addition of P in the centrate boosted the ammonia oxidation process as shown by the higher nitrite production in C than in NC reactors, and confirmed by results of the molecular assays. Nitrification, especially when stopped at the level of nitrite, is undesired in many microalgal cultivation technologies aiming to produce microalgal biomass, since AOB compete for nutrients and CO2 with microalgae, and also they produce nitrite that can inhibit microalgal growth [29]. On the other hand, in wastewater treatment the synergy between microalgae and nitrifiers can be considered an advantage to reduce aeration costs.…”

Section: Discussionmentioning

confidence: 99%

Effect of N:P Ratio on Microalgae/Nitrifying Bacteria Community in Agro-Digestate Treatment

Bellucci

Marazzi

Ficara

et al. 2020

Environmental and Climate Technologies

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The role of P content on the treatment and valorization of the liquid fraction of digestate, namely centrate, through microalgae-based technologies was evaluated in this study. The performance of four column photobioreactors, which were fed on diluted centrate with corrected (10 mg N/ mg P) and not modified (129 mg N/ mg P) N:P ratio, were monitored and compared. The results demonstrated that P shortage in the centrate affected neither the total nitrogen and COD removal rate nor the volumetric biomass productivity, suggesting that expensive addition of P salts is not necessary to maximize the efficiency of the process. On the contrary, the addition of P to the centrate promoted the ammonia oxidation process as higher nitrite production was observed in the photobioreactors with adjusted N:P ratio than in the ones fed with the non-adjusted N:P ratio. These findings were confirmed by fluorescence in-situ hybridization and quantitative PCR assays, which revealed a higher number of ammonia-oxidizing bacteria in the microalgal suspensions cultivated on centrate with P addition. In conclusion, the N:P ratio in the centrate seems to have a role in controlling the nitrification process rather than in the overall nutrient removal rate and biomass productivity of the microalgae-based system.

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“…Ammonia could be removed through microalgal–bacterial assimilation and bacterial dissimilation (e.g., nitrification/nitritation–denitrification) (Figure ). Under light conditions, these two nitrogen removal pathways could coexist in the microalgal–bacterial consortium. ,− For example, about 30%–40% of the removed ammonia nitrogen could be transformed to nitrate, nitrite, and nitrogen gas by nitrification and denitrification, while the rest was converted to phototrophic biomass . High DO concentrations favored bacterial nitrification by ammonia-oxidizing bacteria (AOB). , As such, the long HRT (e.g., 24 h) and external aeration might shift the nitrogen removal from assimilation to dissimilation via nitrification–denitrification in the MBGS process. ,, The occurrence of full nitrification or partial nitrification (i.e., nitritation) in the MBGS process, to some extent, relied on the sludge retention time (SRT) and light intensity.…”

Section: Performance Of Mbgs Under Light and Dark Conditionsmentioning

confidence: 99%

Assessment of Microalgal-Bacterial Granular Sludge Process for Environmentally Sustainable Municipal Wastewater Treatment

Liu

2021

ACS EST Water

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The conventional municipal wastewater treatment processes are facing increasing pressures due to their huge energy consumption, significant emissions of greenhouse gases, and low resource recovery potential. As such, the microalgal–bacterial granular sludge (MBGS) process has recently been explored with the aim for concurrent high-efficiency water, energy, and resource recovery from municipal wastewater in an environmentally sustainable manner. This review attempts to offer a holistic view of the state of the art techniques of MBGS process for municipal wastewater treatment. It was shown that mutualism and symbiosis between microalgae and bacteria could determine the physical structure and microbial community of MBGS. Microbial assimilation instead of dissimilation was identified to be the main mechanisms for removing soluble organics, ammonia, and phosphate in municipal wastewater under both light and dark conditions. Different from the conventional biological nutrients removal processes, wastewater nutrients were effectively fixed into MBGS which could be regarded as a potential source for further energy and resource recovery. Compared to the conventional activated sludge process, the energy consumption and carbon emissions would be reduced, respectively, by 100% and 63% by adopting MBGS. It is apparent that MBGS could offer an alternative toward energy- and carbon-neutral municipal wastewater treatment.

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Nitrite inhibition of microalgae induced by the competition between microalgae and nitrifying bacteria

Cited by 66 publications

References 33 publications

Role of Microalgae in the Recovery of Nutrients from Pig Manure

Role of Microalgae in the Recovery of Nutrients from Pig Manure

Effect of N:P Ratio on Microalgae/Nitrifying Bacteria Community in Agro-Digestate Treatment

Assessment of Microalgal-Bacterial Granular Sludge Process for Environmentally Sustainable Municipal Wastewater Treatment

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