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An application of cellular organic matter to coagulation of cyanobacterial cells (Merismopedia tenuissima)
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SYSNO ASEP 0474945 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title An 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 Title Water Research. - : Elsevier - ISSN 0043-1354
Roč. 122, October (2017), s. 70-77Number of pages 8 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords algal cellular organic matter ; coagulation ; cyanobacterial cells ; Merismopedia tenuissima ; water treatment Subject RIV DJ - Water Pollution ; Quality OECD category Environmental sciences (social aspects to be 5.7) Institutional support UH-J - RVO:67985874 UT WOS 000407404300009 EID SCOPUS 85020031615 DOI 10.1016/j.watres.2017.05.070 Annotation Algae 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.Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2018
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