Physicochemical approach to alkaline flocculation of Chlorella vulgaris induced by calcium phosphate precipitates

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22330%2F18%3A43915568" target="_blank" >RIV/60461373:22330/18:43915568 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985858:_____/18:00487866 RIV/67985874:_____/18:00487866 RIV/00216208:11310/18:10378434

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0927776518301437?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0927776518301437?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.colsurfb.2018.03.007" target="_blank" >10.1016/j.colsurfb.2018.03.007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Physicochemical approach to alkaline flocculation of Chlorella vulgaris induced by calcium phosphate precipitates

Popis výsledku v původním jazyce

Alkaline flocculation has been studied due to its potential as a low-cost harvesting method for microalgae. However, surface properties (zeta potential, contact angles) as inputs into physicochemical interaction models have not yet been applied systematically. In this work, forced alkaline flocculation of the freshwater microalgae Chlorella vulgaris induced by calcium phosphate precipitates was studied as a model system. Response surface methodology was used to quantify the effect of independent variables (concentration of Ca2+ (0.5-0.5 mM) and PO43- (0.05-0.35 mM), pH (8-12) and ionic strength (1-19 mM)) on the zeta potential (ZP) of microalgae, and the turbidity (T) of inorganic precipitates. Flocculation tests and their modified versions were carried out. The flocculation efficiencies obtained were interpreted with respect to predictions of physicochemical interaction models. It was found that flocculation was possible under conditions where appropriate precipitates were formed in the presence of cells. Under these conditions, flocculation of negatively charged Chlorella vulgaris was induced not only by positively charged, but also by negatively charged calcium phosphate precipitates at an early phase of nucleation. The driving force for interactions between oppositely charged cells and precipitate particles was electrostatic attraction, while the attraction between equally charged entities may have resulted from a negative total balance of apolar (Lifsitz-van der Waals) and polar (acid-base) interactions. Medium components did not interfere with flocculation, while cellular organic matter decreased flocculation efficiency only to a very limited extent.

Název v anglickém jazyce

Physicochemical approach to alkaline flocculation of Chlorella vulgaris induced by calcium phosphate precipitates

Popis výsledku anglicky

Alkaline flocculation has been studied due to its potential as a low-cost harvesting method for microalgae. However, surface properties (zeta potential, contact angles) as inputs into physicochemical interaction models have not yet been applied systematically. In this work, forced alkaline flocculation of the freshwater microalgae Chlorella vulgaris induced by calcium phosphate precipitates was studied as a model system. Response surface methodology was used to quantify the effect of independent variables (concentration of Ca2+ (0.5-0.5 mM) and PO43- (0.05-0.35 mM), pH (8-12) and ionic strength (1-19 mM)) on the zeta potential (ZP) of microalgae, and the turbidity (T) of inorganic precipitates. Flocculation tests and their modified versions were carried out. The flocculation efficiencies obtained were interpreted with respect to predictions of physicochemical interaction models. It was found that flocculation was possible under conditions where appropriate precipitates were formed in the presence of cells. Under these conditions, flocculation of negatively charged Chlorella vulgaris was induced not only by positively charged, but also by negatively charged calcium phosphate precipitates at an early phase of nucleation. The driving force for interactions between oppositely charged cells and precipitate particles was electrostatic attraction, while the attraction between equally charged entities may have resulted from a negative total balance of apolar (Lifsitz-van der Waals) and polar (acid-base) interactions. Medium components did not interfere with flocculation, while cellular organic matter decreased flocculation efficiency only to a very limited extent.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20901 - Industrial biotechnology

Projekt

<a href="/cs/project/GA18-05007S" target="_blank" >GA18-05007S: Vliv organických látek produkovaných fytoplanktonem na vlastnosti vloček tvořených během koagulace/flokulace při úpravě vody</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Colloids and Surfaces B: Biointerfaces

ISSN

0927-7765

e-ISSN

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Svazek periodika

166

Číslo periodika v rámci svazku

June 1 2018

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

54-60

Kód UT WoS článku

000432505900008

EID výsledku v databázi Scopus

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