Effect of N:P Ratio on Microalgae/Nitrifying Bacteria Community in Agro-Digestate Treatment
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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Sciendo
2020-09-01
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| Series: | Environmental and Climate Technologies |
| Subjects: | |
| Online Access: | https://doi.org/10.2478/rtuect-2020-0061 |
| _version_ | 1819116420047306752 |
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| author | Bellucci Micol Marazzi Francesca Ficara Elena Mezzanotte Valeria |
| author_facet | Bellucci Micol Marazzi Francesca Ficara Elena Mezzanotte Valeria |
| author_sort | Bellucci Micol |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-22T05:16:48Z |
| format | Article |
| id | doaj.art-81156f8138c64b0ab9753f05c1183307 |
| institution | Directory Open Access Journal |
| issn | 2255-8837 |
| language | English |
| last_indexed | 2024-12-22T05:16:48Z |
| publishDate | 2020-09-01 |
| publisher | Sciendo |
| record_format | Article |
| series | Environmental and Climate Technologies |
| spelling | doaj.art-81156f8138c64b0ab9753f05c11833072022-12-21T18:37:50ZengSciendoEnvironmental and Climate Technologies2255-88372020-09-0124213614810.2478/rtuect-2020-0061rtuect-2020-0061Effect of N:P Ratio on Microalgae/Nitrifying Bacteria Community in Agro-Digestate TreatmentBellucci Micol0Marazzi Francesca1Ficara Elena2Mezzanotte Valeria3Politecnico di Milano, DICA, Piazza L. da Vinci, 32, 20133Milano, ItalyPolitecnico di Milano, DICA, Piazza L. da Vinci, 32, 20133Milano, ItalyPolitecnico di Milano, DICA, Piazza L. da Vinci, 32, 20133Milano, ItalyUniversità degli Studi di Milano Bicocca, DISAT, Piazza della Scienza, 1, 20126Milano, ItalyThe 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.https://doi.org/10.2478/rtuect-2020-0061ammonia oxidationcentratemicroalgae-based technologynutrient removalp content |
| spellingShingle | Bellucci Micol Marazzi Francesca Ficara Elena Mezzanotte Valeria Effect of N:P Ratio on Microalgae/Nitrifying Bacteria Community in Agro-Digestate Treatment Environmental and Climate Technologies ammonia oxidation centrate microalgae-based technology nutrient removal p content |
| title | Effect of N:P Ratio on Microalgae/Nitrifying Bacteria Community in Agro-Digestate Treatment |
| title_full | Effect of N:P Ratio on Microalgae/Nitrifying Bacteria Community in Agro-Digestate Treatment |
| title_fullStr | Effect of N:P Ratio on Microalgae/Nitrifying Bacteria Community in Agro-Digestate Treatment |
| title_full_unstemmed | Effect of N:P Ratio on Microalgae/Nitrifying Bacteria Community in Agro-Digestate Treatment |
| title_short | Effect of N:P Ratio on Microalgae/Nitrifying Bacteria Community in Agro-Digestate Treatment |
| title_sort | effect of n p ratio on microalgae nitrifying bacteria community in agro digestate treatment |
| topic | ammonia oxidation centrate microalgae-based technology nutrient removal p content |
| url | https://doi.org/10.2478/rtuect-2020-0061 |
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