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Indirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation
Algae bloom in coastal waters is partly supported by residual nutrients in treated wastewater (WW) released from coastally located treatment plants. In response, a Chlorella vulgaris-based photobioreactor was recently proposed for lowering nutrient levels in WW prior to release. However, the solutio...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8484453/ https://www.ncbi.nlm.nih.gov/pubmed/34593845 http://dx.doi.org/10.1038/s41598-021-98634-0 |
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author | Otim, Francesca Nyega Chen, I-Ru Otim, Ochan |
author_facet | Otim, Francesca Nyega Chen, I-Ru Otim, Ochan |
author_sort | Otim, Francesca Nyega |
collection | PubMed |
description | Algae bloom in coastal waters is partly supported by residual nutrients in treated wastewater (WW) released from coastally located treatment plants. In response, a Chlorella vulgaris-based photobioreactor was recently proposed for lowering nutrient levels in WW prior to release. However, the solution requires maintaining biomass accumulation to within a photobioreactor capacity for optimum operation. For high density Chlorella vulgaris suspensions, this is easily done by monitoring turbidity increase, a property directly related to biomass accumulation. For low density suspensions however, direct turbidity measurement would require a cumbersome process of concentrating large volumes of Chlorella vulgaris suspensions. Here, we demonstrate that by measuring pH of the suspensions, turbidity (T) can be estimated indirectly by the following wastewater-dependent expression: pH = aT + pH(0), hence avoiding the need to concentrate large volumes. The term pH(0) is the initial pH of the suspensions and a, a wastewater-dependent constant, can be computed independently from a = − 0.0061*pH(0) + 0.052. In the event %WW is unknown, the following wastewater-independent Gaussian expression can be used to estimate T: pH = 8.71*exp(− [(T − 250)(2)]/[2*1.26E05]). These three equations should offer an avenue for monitoring the turbidity of dilute Chlorella vulgaris suspensions in large, stagnant municipal Chlorella vulgaris-based wastewater treatment system via pH measurements. |
format | Online Article Text |
id | pubmed-8484453 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-84844532021-10-04 Indirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation Otim, Francesca Nyega Chen, I-Ru Otim, Ochan Sci Rep Article Algae bloom in coastal waters is partly supported by residual nutrients in treated wastewater (WW) released from coastally located treatment plants. In response, a Chlorella vulgaris-based photobioreactor was recently proposed for lowering nutrient levels in WW prior to release. However, the solution requires maintaining biomass accumulation to within a photobioreactor capacity for optimum operation. For high density Chlorella vulgaris suspensions, this is easily done by monitoring turbidity increase, a property directly related to biomass accumulation. For low density suspensions however, direct turbidity measurement would require a cumbersome process of concentrating large volumes of Chlorella vulgaris suspensions. Here, we demonstrate that by measuring pH of the suspensions, turbidity (T) can be estimated indirectly by the following wastewater-dependent expression: pH = aT + pH(0), hence avoiding the need to concentrate large volumes. The term pH(0) is the initial pH of the suspensions and a, a wastewater-dependent constant, can be computed independently from a = − 0.0061*pH(0) + 0.052. In the event %WW is unknown, the following wastewater-independent Gaussian expression can be used to estimate T: pH = 8.71*exp(− [(T − 250)(2)]/[2*1.26E05]). These three equations should offer an avenue for monitoring the turbidity of dilute Chlorella vulgaris suspensions in large, stagnant municipal Chlorella vulgaris-based wastewater treatment system via pH measurements. Nature Publishing Group UK 2021-09-30 /pmc/articles/PMC8484453/ /pubmed/34593845 http://dx.doi.org/10.1038/s41598-021-98634-0 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Otim, Francesca Nyega Chen, I-Ru Otim, Ochan Indirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation |
title | Indirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation |
title_full | Indirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation |
title_fullStr | Indirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation |
title_full_unstemmed | Indirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation |
title_short | Indirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation |
title_sort | indirect assessment of biomass accumulation in a wastewater-based chlorella vulgaris photobioreactor by ph variation |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8484453/ https://www.ncbi.nlm.nih.gov/pubmed/34593845 http://dx.doi.org/10.1038/s41598-021-98634-0 |
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