Počet záznamů: 1
Consequences of ozonation for the limited coagulation of non-proteinaceous AOM and formation of aldehydes as ozonation by-products
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SYSNO ASEP 0531854 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Consequences of ozonation for the limited coagulation of non-proteinaceous AOM and formation of aldehydes as ozonation by-products Tvůrce(i) Novotná, Kateřina (UH-J) SAI, ORCID, RID
Pivokonský, Martin (UH-J) SAI, ORCID, RID
Prokopová, Michaela (UH-J) ORCID, RID, SAI
Barešová, Magdalena (UH-J) RID, ORCID, SAI
Pivokonská, Lenka (UH-J) SAI, ORCID, RIDČíslo článku 104455 Zdroj.dok. Journal of Environmental Chemical Engineering. - : Elsevier - ISSN 2213-2929
Roč. 8, č. 6 (2020)Poč.str. 9 s. Forma vydání Online - E Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova aldehydes ; algal organic matter ; alum coagulation ; drinking water treatment ; oxidation Vědní obor RIV DJ - Znečištění a kontrola vody Obor OECD Environmental sciences (social aspects to be 5.7) CEP GA18-14445S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora UH-J - RVO:67985874 UT WOS 000600409500004 EID SCOPUS 85092305027 DOI 10.1016/j.jece.2020.104455 Anotace Limited knowledge of how ozonation affects algal organic matter (AOM) character and removal hinders assessing the suitability of ozonation for treating AOM-laden waters. This study examines pre-ozonation-coagulation and coagulation-post-ozonation of AOM, specifically its non-proteinaceous fraction (NP). O3 doses of 0.05–4.0 mg per 5 mg dissolved organic carbon were applied at pH 5.5, 7.8, and 9.0, coagulation was performed in pH range 5.0–9.0. Coagulation alone exhibited maximum removal of 15%, and pre-ozonation before coagulation had different impacts depending on both the O3 dose and ozonation pH. In case of pH 5.5 and 7.8, the lowest and highest O3 doses improved the removal (by max. 7%), by contrast, the medium O3 dose deteriorated coagulation. In case of pH 9.0, at which different oxidation pathways predominate, the low and medium O3 doses had negligible effects, while the highest O3 dose improved NP removal (by max. 11%). Noteworthy is that despite these trends appeared throughout the whole coagulation pH range, NP removal depended also on coagulation pH. Post-ozonation after coagulation contributed to NP removal (additional 5–6%) at the highest O3 dose. In general, positive effects of ozonation were ascribed to charge alterations and partial mineralization of NP, adverse effects to changes in molecular weights. Additionally, aldehydes (up to 34.2 μg mg-1 DOC, predominantly formaldehyde and acetaldehyde) were formed whenever ozonation was involved, more with increasing O3 dose, and regardless the ozonation pH. The results emphasize the importance of optimizing ozonation so as to reach the benefits and avoid the undesirable effects on water quality. Pracoviště Ústav pro hydrodynamiku Kontakt Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Rok sběru 2021 Elektronická adresa https://www.sciencedirect.com/science/article/pii/S2213343720308046
Počet záznamů: 1