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Influence of COM-peptides/proteins on the properties of flocs formed at different shear rates
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SYSNO ASEP 0497268 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Influence of COM-peptides/proteins on the properties of flocs formed at different shear rates Author(s) Filipenská, Monika (UH-J) ORCID, RID
Vašatová, Petra (UH-J) RID, ORCID, SAI
Pivokonská, Lenka (UH-J) SAI, ORCID, RID
Čermáková, Lenka (UH-J) RID, ORCID, SAI
Gonzales-Torres, A. (AU)
Henderson, R.K. (AU)
Načeradská, Jana (UH-J) SAI, ORCID, RID
Pivokonský, Martin (UH-J) SAI, ORCID, RIDSource Title Journal of Environmental Sciences. - : Science Press - ISSN 1001-0742
Roč. 80, June (2019), s. 116-127Number of pages 12 s. Publication form Print - P Language eng - English Country CN - China Keywords algal organic matter ; floc size ; coagulation ; image analysis ; water treatment Subject RIV DJ - Water Pollution ; Quality OECD category Environmental sciences (social aspects to be 5.7) R&D Projects GA18-05007S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UH-J - RVO:67985874 UT WOS 000463379500012 EID SCOPUS 85058622720 DOI 10.1016/j.jes.2018.11.025 Annotation Coagulation followed by floc separation is a key process for the removal of algal organic matter (AOM) in water treatment. Besides optimizing coagulation parameters, knowledge of the properties of AOM-flocs is essential to maximizing AOM removal. However, the impact of AOM on the floc properties remains unclear. This study investigated how peptides/proteins derived from the cellular organic matter (COM) of the cyanobacterium Microcystis aeruginosa influenced the size, structure, and shape of flocs formed at different shear rates (G). Flocs formed by kaolinite, COM-peptides/proteins and a mixture of the same were studied, and the effect of intermolecular interactions between floc components on floc properties was assessed. The coagulation experiments were performed in a Taylor-Couette reactor, with aluminum (Al) or ferric sulphate (Fe) utilized as coagulants. Image analysis was performed to gauge floc size and obtain data on fractal dimension. It was found that floc properties were affected by the presence of the COM-peptides/proteins and the coagulant used. COM-peptides/proteins increased floc size and porosity and widened floc size distributions. The Fe coagulant produced larger and less compact flocs than Al coagulant. Moreover, the decrease in floc size that occurred in parallel with increase in shear rate was not smooth in progress. A rapid change for the kaolinite-coagulant suspension and two rapid changes for the suspensions containing COM were observed. These were attributed to various intermolecular interactions between floc components participating in coagulation at different G. Based on the results obtained, shear rates suitable for efficient separation of flocs containing COM were suggested. (C) 2018 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2020 Electronic address http://hdl.handle.net/11104/0295777
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