Ozonation and coagulation of non-proteinaceous algal organic matter

0542420 - ÚH 2022 RIV LV eng A - Abstract
Prokopová, Michaela - Novotná, Kateřina - Pivokonská, Lenka - Pivokonský, Martin
Ozonation and coagulation of non-proteinaceous algal organic matter.
Book of abstracts. Water research and innovations in digital era. Riga: Riga Technical Universtiy, 2021 - (Feierabend,, M.; Juhna, T.; Dejus, S.). s. 94-95. ISBN 978-9934-22-618-2.
[Eastern European Young Water Professionals Conference /12./. 31.03.2021-02.04.2021, Riga]
Institutional support: RVO:67985874
Keywords : algal organic matter * alum coagulation * ozonation * drinking water treatment
OECD category: Environmental sciences (social aspects to be 5.7)
https://ebooks.rtu.lv/product/12th-eastern-european-young-water-professionals-conference-water-research-innovations-digital-era-book-abstracts/?lang=en

This research 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%). 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.
Permanent Link: http://hdl.handle.net/11104/0319835