Indirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation

Abstract 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, th...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Francesca Nyega Otim, I-Ru Chen, Ochan Otim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/16d232521dae4e32bd0daa5a06d319da
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:16d232521dae4e32bd0daa5a06d319da
record_format	dspace
spelling	oai:doaj.org-article:16d232521dae4e32bd0daa5a06d319da2021-12-02T17:37:35ZIndirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation10.1038/s41598-021-98634-02045-2322https://doaj.org/article/16d232521dae4e32bd0daa5a06d319da2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-98634-0https://doaj.org/toc/2045-2322Abstract 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 + pH0, hence avoiding the need to concentrate large volumes. The term pH0 is the initial pH of the suspensions and a, a wastewater-dependent constant, can be computed independently from a = − 0.0061pH0 + 0.052. In the event %WW is unknown, the following wastewater-independent Gaussian expression can be used to estimate T: pH = 8.71exp(− [(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.Francesca Nyega OtimI-Ru ChenOchan OtimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Francesca Nyega Otim I-Ru Chen Ochan Otim Indirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation
description	Abstract 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 + pH0, hence avoiding the need to concentrate large volumes. The term pH0 is the initial pH of the suspensions and a, a wastewater-dependent constant, can be computed independently from a = − 0.0061pH0 + 0.052. In the event %WW is unknown, the following wastewater-independent Gaussian expression can be used to estimate T: pH = 8.71exp(− [(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	article
author	Francesca Nyega Otim I-Ru Chen Ochan Otim
author_facet	Francesca Nyega Otim I-Ru Chen Ochan Otim
author_sort	Francesca Nyega Otim
title	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_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_sort	indirect assessment of biomass accumulation in a wastewater-based chlorella vulgaris photobioreactor by ph variation
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/16d232521dae4e32bd0daa5a06d319da
work_keys_str_mv	AT francescanyegaotim indirectassessmentofbiomassaccumulationinawastewaterbasedchlorellavulgarisphotobioreactorbyphvariation AT iruchen indirectassessmentofbiomassaccumulationinawastewaterbasedchlorellavulgarisphotobioreactorbyphvariation AT ochanotim indirectassessmentofbiomassaccumulationinawastewaterbasedchlorellavulgarisphotobioreactorbyphvariation
_version_	1718379867711471616

Indirect assessment of biomass accumulation in a wastewater-based Chlorella vulgaris photobioreactor by pH variation

Ejemplares similares