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An application of cellular organic matter to coagulation of cyanobacterial cells (Merismopedia tenuissima)

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    SYSNO ASEP0474945
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleAn application of cellular organic matter to coagulation of cyanobacterial cells (Merismopedia tenuissima)
    Author(s) Barešová, Magdalena (UH-J) RID, ORCID, SAI
    Pivokonský, Martin (UH-J) SAI, ORCID, RID
    Novotná, Kateřina (UH-J) SAI, ORCID, RID
    Načeradská, Jana (UH-J) SAI, ORCID, RID
    Brányik, T. (CZ)
    Source TitleWater Research. - : Elsevier - ISSN 0043-1354
    Roč. 122, October (2017), s. 70-77
    Number of pages8 s.
    Publication formPrint - P
    Languageeng - English
    CountryGB - United Kingdom
    Keywordsalgal cellular organic matter ; coagulation ; cyanobacterial cells ; Merismopedia tenuissima ; water treatment
    Subject RIVDJ - Water Pollution ; Quality
    OBOR OECDEnvironmental sciences (social aspects to be 5.7)
    Institutional supportUH-J - RVO:67985874
    UT WOS000407404300009
    EID SCOPUS85020031615
    AnnotationAlgae affect the performance of drinking water treatment significantly when they decay and release considerable amounts of cellular organic matter (COM). The study describes the cyanobacterium Merismopedia tenuissima and its COM and investigates the effect of their simultaneous coagulation. As COM is highly complex mixture, we characterised it in terms of hydrophobicity, protein content and molecular weights (MWs). To describe the coagulation mechanisms and molecular interactions in the system, we determined both COM and cell surface charge by means of potentiometric titration and zeta potential analysis, respectively, and performed the jar tests with single components and their mixtures with and without a coagulant (ferric sulphate). The coagulation tests performed with the individual components or with their mixtures proved efficient cell removals (up to 99%) but relatively low COM removals (37 ÷ 57%). This disproportion can be attributed to the prevalence of hydrophilic compounds and to the high portion of low-MW organics in COM. Coagulation of COM/cell mixtures achieved comparable efficacy with single component tests, using even lower coagulant
    doses. Furthermore, COM presence substantially deviated the pH optimum for cell removal and thus altered coagulation mechanisms. While single cells interacted prevailingly through adsorption onto Fe-oxide-hydroxides at about neutral pH (6.0–7.7), the COM/cell mixtures succumbed to charge neutralisation by Fe-hydroxopolymers within moderately acidic pH range (5.0–6.5). Moreover, COM initiated cell flocculation also at acidic pH in both the presence (pH 3.4–3.9) and the absence of a coagulant (pH 3.6–4.6). This supportive effect is ascribed to relatively high-MW COM (>10 kDa), serving as a natural flocculant through inter-particle bridging mechanism and exhibiting nearly the same COM/cell removals as ferric sulphate.
    WorkplaceInstitute of Hydrodynamics
    ContactSoňa Hnilicová,, Tel.: 233 109 003
    Year of Publishing2018
Number of the records: 1