Physicochemical approach to alkaline flocculation of Chlorella vulgaris induced by calcium phosphate precipitates
The result's identifiers
Result code in 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>
Alternative codes found
RIV/67985858:_____/18:00487866 RIV/67985874:_____/18:00487866 RIV/00216208:11310/18:10378434
Result on the web
<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>
Alternative languages
Result language
angličtina
Original language name
Physicochemical approach to alkaline flocculation of Chlorella vulgaris induced by calcium phosphate precipitates
Original language description
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.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20901 - Industrial biotechnology
Result continuities
Project
<a href="/en/project/GA18-05007S" target="_blank" >GA18-05007S: Influence of algal organic matter on properties of flocs formed during coagulation/flocculation in water treatment</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Colloids and Surfaces B: Biointerfaces
ISSN
0927-7765
e-ISSN
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Volume of the periodical
166
Issue of the periodical within the volume
June 1 2018
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
54-60
UT code for WoS article
000432505900008
EID of the result in the Scopus database
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