Assessment of microalgae and nitrifiers activity in a consortium in a continuous operation and the effect of oxygen depletion
Background: Industrial wastewaters with a high content of nitrogen are a relevant environmental problem. Currently, treatments to remove nitrogen are not efficient, so is necessary to develop alternative methods. The objective of this study is to investigate a consortium of microalgae - nitrifying,...
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Pontificia Universidad Católica de Valparaíso
2016
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oai:scielo:S0717-345820160005000072016-10-26Assessment of microalgae and nitrifiers activity in a consortium in a continuous operation and the effect of oxygen depletionVargas,GustavoDonoso-Bravo,AndrésVergara,ChristianRuiz-Filippi,Gonzalo Ammonium Consortium nitrifying-microalgae Oxygen Respirometry Background: Industrial wastewaters with a high content of nitrogen are a relevant environmental problem. Currently, treatments to remove nitrogen are not efficient, so is necessary to develop alternative methods. The objective of this study is to investigate a consortium of microalgae - nitrifying, that due to the symbiosis between them could be an interesting alternative. Results: In this study, it was possible to obtain a consortium of nitrifying bacteria (NB) and microalgae (MA) capable of operating with low requirements of dissolved oxygen, using aerobic sludge from wastewater treatment plants. During the operation, this consortium presents removal percentages above 98% of ammonia, even at concentrations of DO of 0.5 mg O2 L-1. It is estimated that the removal was caused both by the action of nitrifying bacteria and microalgae. It was determined that approximately 60% of the ammonia feed was oxidized to nitrate by nitrifying bacteria, while the algae assimilated 40% of the nitrogen feed at steady state. A methodology for measuring the specific activities of nitrifying bacteria and microalgae by comparing the rates in the variation inorganic nitrogen compounds was established with satisfactory results. An average specific activity of 0.05 and 0.02 g NH4 + gVSS-1 d-1 for nitrifying bacteria and microalgae was determined, respectively. Conclusions: The consortium it can be obtained in a single continuous operation, and has a high capacity for nitrogen removal with low oxygen content. The consortium could prove to be a more economical method compared to traditional.info:eu-repo/semantics/openAccessPontificia Universidad Católica de ValparaísoElectronic Journal of Biotechnology v.19 n.5 20162016-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500007en10.1016/j.ejbt.2016.08.002 |
| institution |
Scielo Chile |
| collection |
Scielo Chile |
| language |
English |
| topic |
Ammonium Consortium nitrifying-microalgae Oxygen Respirometry |
| spellingShingle |
Ammonium Consortium nitrifying-microalgae Oxygen Respirometry Vargas,Gustavo Donoso-Bravo,Andrés Vergara,Christian Ruiz-Filippi,Gonzalo Assessment of microalgae and nitrifiers activity in a consortium in a continuous operation and the effect of oxygen depletion |
| description |
Background: Industrial wastewaters with a high content of nitrogen are a relevant environmental problem. Currently, treatments to remove nitrogen are not efficient, so is necessary to develop alternative methods. The objective of this study is to investigate a consortium of microalgae - nitrifying, that due to the symbiosis between them could be an interesting alternative. Results: In this study, it was possible to obtain a consortium of nitrifying bacteria (NB) and microalgae (MA) capable of operating with low requirements of dissolved oxygen, using aerobic sludge from wastewater treatment plants. During the operation, this consortium presents removal percentages above 98% of ammonia, even at concentrations of DO of 0.5 mg O2 L-1. It is estimated that the removal was caused both by the action of nitrifying bacteria and microalgae. It was determined that approximately 60% of the ammonia feed was oxidized to nitrate by nitrifying bacteria, while the algae assimilated 40% of the nitrogen feed at steady state. A methodology for measuring the specific activities of nitrifying bacteria and microalgae by comparing the rates in the variation inorganic nitrogen compounds was established with satisfactory results. An average specific activity of 0.05 and 0.02 g NH4 + gVSS-1 d-1 for nitrifying bacteria and microalgae was determined, respectively. Conclusions: The consortium it can be obtained in a single continuous operation, and has a high capacity for nitrogen removal with low oxygen content. The consortium could prove to be a more economical method compared to traditional. |
| author |
Vargas,Gustavo Donoso-Bravo,Andrés Vergara,Christian Ruiz-Filippi,Gonzalo |
| author_facet |
Vargas,Gustavo Donoso-Bravo,Andrés Vergara,Christian Ruiz-Filippi,Gonzalo |
| author_sort |
Vargas,Gustavo |
| title |
Assessment of microalgae and nitrifiers activity in a consortium in a continuous operation and the effect of oxygen depletion |
| title_short |
Assessment of microalgae and nitrifiers activity in a consortium in a continuous operation and the effect of oxygen depletion |
| title_full |
Assessment of microalgae and nitrifiers activity in a consortium in a continuous operation and the effect of oxygen depletion |
| title_fullStr |
Assessment of microalgae and nitrifiers activity in a consortium in a continuous operation and the effect of oxygen depletion |
| title_full_unstemmed |
Assessment of microalgae and nitrifiers activity in a consortium in a continuous operation and the effect of oxygen depletion |
| title_sort |
assessment of microalgae and nitrifiers activity in a consortium in a continuous operation and the effect of oxygen depletion |
| publisher |
Pontificia Universidad Católica de Valparaíso |
| publishDate |
2016 |
| url |
http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582016000500007 |
| work_keys_str_mv |
AT vargasgustavo assessmentofmicroalgaeandnitrifiersactivityinaconsortiuminacontinuousoperationandtheeffectofoxygendepletion AT donosobravoandres assessmentofmicroalgaeandnitrifiersactivityinaconsortiuminacontinuousoperationandtheeffectofoxygendepletion AT vergarachristian assessmentofmicroalgaeandnitrifiersactivityinaconsortiuminacontinuousoperationandtheeffectofoxygendepletion AT ruizfilippigonzalo assessmentofmicroalgaeandnitrifiersactivityinaconsortiuminacontinuousoperationandtheeffectofoxygendepletion |
| _version_ |
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