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Effects of electron acceptors on sulphate reduction activity in activated sludge processes
The concentration of sulphate present in wastewater can vary from 10 to 500 mg SO(4) (2−)/L. During anaerobic conditions, sulphate is reduced to sulphide by sulphate-reducing bacteria (SRB). Sulphide generation is undesired in wastewater treatment plants (WWTPs). Previous research indicated that SRB...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Springer Berlin Heidelberg
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5522498/ https://www.ncbi.nlm.nih.gov/pubmed/28547567 http://dx.doi.org/10.1007/s00253-017-8340-3 |
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author | Rubio-Rincón, Francisco Lopez-Vazquez, Carlos Welles, Laurens van den Brand, Tessa Abbas, Ben van Loosdrecht, Mark Brdjanovic, Damir |
author_facet | Rubio-Rincón, Francisco Lopez-Vazquez, Carlos Welles, Laurens van den Brand, Tessa Abbas, Ben van Loosdrecht, Mark Brdjanovic, Damir |
author_sort | Rubio-Rincón, Francisco |
collection | PubMed |
description | The concentration of sulphate present in wastewater can vary from 10 to 500 mg SO(4) (2−)/L. During anaerobic conditions, sulphate is reduced to sulphide by sulphate-reducing bacteria (SRB). Sulphide generation is undesired in wastewater treatment plants (WWTPs). Previous research indicated that SRB are inhibited by the presence of electron acceptors (such as O(2), NO(3) and NO(2)). However, the contact times and concentrations used in those studies are by far higher than occur in WWTPs. Since sulphide can influence the biological nitrogen and phosphorus removal processes, this research aimed to understand how the different electron acceptors commonly present in biological nutrient removal (BNR) systems can affect the proliferation of SRB. For this purpose, a culture of SRB was enriched in a sequencing batch reactor (approx. 88% of the total bacteria population). Once enriched, the SRB were exposed for 2 h to typical concentrations of electron acceptors like those observed in BNR systems. Their activity was assessed using three different types of electron donors (acetate, propionate and lactate). Oxygen was the most inhibiting electron acceptor regardless the carbon source used. After exposure to oxygen and when feeding acetate, an inactivation time in the sulphate reduction activity was observed for 1.75 h. Once the sulphate reduction activity resumed, only 60% of the original activity was recovered. It is suggested that the proliferation of SRB is most likely to occur in BNR plants with an anaerobic fraction higher than 15% and operating at sludge retention times higher than 20 days (at a temperature of 20 °C). These results can be used to implement strategies to control the growth of sulphate reducers that might compete for organic carbon with phosphate-accumulating organisms. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00253-017-8340-3) contains supplementary material, which is available to authorized users. |
format | Online Article Text |
id | pubmed-5522498 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-55224982017-08-07 Effects of electron acceptors on sulphate reduction activity in activated sludge processes Rubio-Rincón, Francisco Lopez-Vazquez, Carlos Welles, Laurens van den Brand, Tessa Abbas, Ben van Loosdrecht, Mark Brdjanovic, Damir Appl Microbiol Biotechnol Environmental Biotechnology The concentration of sulphate present in wastewater can vary from 10 to 500 mg SO(4) (2−)/L. During anaerobic conditions, sulphate is reduced to sulphide by sulphate-reducing bacteria (SRB). Sulphide generation is undesired in wastewater treatment plants (WWTPs). Previous research indicated that SRB are inhibited by the presence of electron acceptors (such as O(2), NO(3) and NO(2)). However, the contact times and concentrations used in those studies are by far higher than occur in WWTPs. Since sulphide can influence the biological nitrogen and phosphorus removal processes, this research aimed to understand how the different electron acceptors commonly present in biological nutrient removal (BNR) systems can affect the proliferation of SRB. For this purpose, a culture of SRB was enriched in a sequencing batch reactor (approx. 88% of the total bacteria population). Once enriched, the SRB were exposed for 2 h to typical concentrations of electron acceptors like those observed in BNR systems. Their activity was assessed using three different types of electron donors (acetate, propionate and lactate). Oxygen was the most inhibiting electron acceptor regardless the carbon source used. After exposure to oxygen and when feeding acetate, an inactivation time in the sulphate reduction activity was observed for 1.75 h. Once the sulphate reduction activity resumed, only 60% of the original activity was recovered. It is suggested that the proliferation of SRB is most likely to occur in BNR plants with an anaerobic fraction higher than 15% and operating at sludge retention times higher than 20 days (at a temperature of 20 °C). These results can be used to implement strategies to control the growth of sulphate reducers that might compete for organic carbon with phosphate-accumulating organisms. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1007/s00253-017-8340-3) contains supplementary material, which is available to authorized users. Springer Berlin Heidelberg 2017-05-25 2017 /pmc/articles/PMC5522498/ /pubmed/28547567 http://dx.doi.org/10.1007/s00253-017-8340-3 Text en © The Author(s) 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
spellingShingle | Environmental Biotechnology Rubio-Rincón, Francisco Lopez-Vazquez, Carlos Welles, Laurens van den Brand, Tessa Abbas, Ben van Loosdrecht, Mark Brdjanovic, Damir Effects of electron acceptors on sulphate reduction activity in activated sludge processes |
title | Effects of electron acceptors on sulphate reduction activity in activated sludge processes |
title_full | Effects of electron acceptors on sulphate reduction activity in activated sludge processes |
title_fullStr | Effects of electron acceptors on sulphate reduction activity in activated sludge processes |
title_full_unstemmed | Effects of electron acceptors on sulphate reduction activity in activated sludge processes |
title_short | Effects of electron acceptors on sulphate reduction activity in activated sludge processes |
title_sort | effects of electron acceptors on sulphate reduction activity in activated sludge processes |
topic | Environmental Biotechnology |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5522498/ https://www.ncbi.nlm.nih.gov/pubmed/28547567 http://dx.doi.org/10.1007/s00253-017-8340-3 |
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