Inhibition of Cyanobacterial Growth on a Municipal Wastewater Sidestream Is Impacted by Temperature

ABSTRACT Sidestreams in wastewater treatment plants can serve as concentrated sources of nutrients (i.e., nitrogen and phosphorus) to support the growth of photosynthetic organisms that ultimately serve as feedstock for production of fuels and chemicals. However, other chemical characteristics of th...

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Autores principales:	Travis C. Korosh, Andrew Dutcher, Brian F. Pfleger, Katherine D. McMahon
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2018
Materias:	Synechococcus strain PCC 7002 cyanobacteria nutrient removal wastewater treatment Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/0884431df9af4ee2974e71ae153836c4
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spelling	oai:doaj.org-article:0884431df9af4ee2974e71ae153836c42021-11-15T15:22:01ZInhibition of Cyanobacterial Growth on a Municipal Wastewater Sidestream Is Impacted by Temperature10.1128/mSphere.00538-172379-5042https://doaj.org/article/0884431df9af4ee2974e71ae153836c42018-02-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mSphere.00538-17https://doaj.org/toc/2379-5042ABSTRACT Sidestreams in wastewater treatment plants can serve as concentrated sources of nutrients (i.e., nitrogen and phosphorus) to support the growth of photosynthetic organisms that ultimately serve as feedstock for production of fuels and chemicals. However, other chemical characteristics of these streams may inhibit growth in unanticipated ways. Here, we evaluated the use of liquid recovered from municipal anaerobic digesters via gravity belt filtration as a nutrient source for growing the cyanobacterium Synechococcus sp. strain PCC 7002. The gravity belt filtrate (GBF) contained high levels of complex dissolved organic matter (DOM), which seemed to negatively influence cells. We investigated the impact of GBF on physiological parameters such as growth rate, membrane integrity, membrane composition, photosystem composition, and oxygen evolution from photosystem II. At 37°C, we observed an inverse correlation between GBF concentration and membrane integrity. Radical production was also detected upon exposure to GBF at 37°C. However, the dose-dependent relationship between the GBF concentration and the lack of membrane integrity was abolished at 27°C. Immediate resuspension of strains in high levels of GBF showed markedly reduced oxygen evolution rates relative to those seen with the control. Taken together, the data indicate that one mechanism responsible for GBF toxicity to Synechococcus is the interruption of photosynthetic electron flow and subsequent phenomena. We hypothesize that this is likely due to the presence of phenolic compounds within the DOM. IMPORTANCE Cyanobacteria are viewed as promising platforms to produce fuels and/or high-value chemicals as part of so-called “biorefineries.” Their integration into wastewater treatment systems is particularly interesting because removal of the nitrogen and phosphorus in many wastewater streams is an expensive but necessary part of wastewater treatment. In this study, we evaluated strategies for cultivating Synechococcus sp. strain PCC 7002 on media comprised of two wastewater streams, i.e., treated secondary effluent supplemented with the liquid fraction extracted from sludge following anaerobic digestion. This strain is commonly used for metabolic engineering to produce a variety of valuable chemical products and product precursors (e.g., lactate). However, initial attempts to grow PCC 7002 under otherwise-standard conditions of light and temperature failed. We thus systematically evaluated alternative cultivation conditions and then used multiple methods to dissect the apparent toxicity of the media under standard cultivation conditions.Travis C. KoroshAndrew DutcherBrian F. PflegerKatherine D. McMahonAmerican Society for MicrobiologyarticleSynechococcus strain PCC 7002cyanobacterianutrient removalwastewater treatmentMicrobiologyQR1-502ENmSphere, Vol 3, Iss 1 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Synechococcus strain PCC 7002 cyanobacteria nutrient removal wastewater treatment Microbiology QR1-502
spellingShingle	Synechococcus strain PCC 7002 cyanobacteria nutrient removal wastewater treatment Microbiology QR1-502 Travis C. Korosh Andrew Dutcher Brian F. Pfleger Katherine D. McMahon Inhibition of Cyanobacterial Growth on a Municipal Wastewater Sidestream Is Impacted by Temperature
description	ABSTRACT Sidestreams in wastewater treatment plants can serve as concentrated sources of nutrients (i.e., nitrogen and phosphorus) to support the growth of photosynthetic organisms that ultimately serve as feedstock for production of fuels and chemicals. However, other chemical characteristics of these streams may inhibit growth in unanticipated ways. Here, we evaluated the use of liquid recovered from municipal anaerobic digesters via gravity belt filtration as a nutrient source for growing the cyanobacterium Synechococcus sp. strain PCC 7002. The gravity belt filtrate (GBF) contained high levels of complex dissolved organic matter (DOM), which seemed to negatively influence cells. We investigated the impact of GBF on physiological parameters such as growth rate, membrane integrity, membrane composition, photosystem composition, and oxygen evolution from photosystem II. At 37°C, we observed an inverse correlation between GBF concentration and membrane integrity. Radical production was also detected upon exposure to GBF at 37°C. However, the dose-dependent relationship between the GBF concentration and the lack of membrane integrity was abolished at 27°C. Immediate resuspension of strains in high levels of GBF showed markedly reduced oxygen evolution rates relative to those seen with the control. Taken together, the data indicate that one mechanism responsible for GBF toxicity to Synechococcus is the interruption of photosynthetic electron flow and subsequent phenomena. We hypothesize that this is likely due to the presence of phenolic compounds within the DOM. IMPORTANCE Cyanobacteria are viewed as promising platforms to produce fuels and/or high-value chemicals as part of so-called “biorefineries.” Their integration into wastewater treatment systems is particularly interesting because removal of the nitrogen and phosphorus in many wastewater streams is an expensive but necessary part of wastewater treatment. In this study, we evaluated strategies for cultivating Synechococcus sp. strain PCC 7002 on media comprised of two wastewater streams, i.e., treated secondary effluent supplemented with the liquid fraction extracted from sludge following anaerobic digestion. This strain is commonly used for metabolic engineering to produce a variety of valuable chemical products and product precursors (e.g., lactate). However, initial attempts to grow PCC 7002 under otherwise-standard conditions of light and temperature failed. We thus systematically evaluated alternative cultivation conditions and then used multiple methods to dissect the apparent toxicity of the media under standard cultivation conditions.
format	article
author	Travis C. Korosh Andrew Dutcher Brian F. Pfleger Katherine D. McMahon
author_facet	Travis C. Korosh Andrew Dutcher Brian F. Pfleger Katherine D. McMahon
author_sort	Travis C. Korosh
title	Inhibition of Cyanobacterial Growth on a Municipal Wastewater Sidestream Is Impacted by Temperature
title_short	Inhibition of Cyanobacterial Growth on a Municipal Wastewater Sidestream Is Impacted by Temperature
title_full	Inhibition of Cyanobacterial Growth on a Municipal Wastewater Sidestream Is Impacted by Temperature
title_fullStr	Inhibition of Cyanobacterial Growth on a Municipal Wastewater Sidestream Is Impacted by Temperature
title_full_unstemmed	Inhibition of Cyanobacterial Growth on a Municipal Wastewater Sidestream Is Impacted by Temperature
title_sort	inhibition of cyanobacterial growth on a municipal wastewater sidestream is impacted by temperature
publisher	American Society for Microbiology
publishDate	2018
url	https://doaj.org/article/0884431df9af4ee2974e71ae153836c4
work_keys_str_mv	AT travisckorosh inhibitionofcyanobacterialgrowthonamunicipalwastewatersidestreamisimpactedbytemperature AT andrewdutcher inhibitionofcyanobacterialgrowthonamunicipalwastewatersidestreamisimpactedbytemperature AT brianfpfleger inhibitionofcyanobacterialgrowthonamunicipalwastewatersidestreamisimpactedbytemperature AT katherinedmcmahon inhibitionofcyanobacterialgrowthonamunicipalwastewatersidestreamisimpactedbytemperature
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Inhibition of Cyanobacterial Growth on a Municipal Wastewater Sidestream Is Impacted by Temperature

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