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Investigating the coagulation of non-proteinaceous algal organic matter: Optimizing coagulation performance and identification of removal mechanisms
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SYSNO ASEP 0494454 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Investigating the coagulation of non-proteinaceous algal organic matter: Optimizing coagulation performance and identification of removal mechanisms Author(s) Načeradská, Jana (UH-J) SAI, ORCID, RID
Novotná, Kateřina (UH-J) SAI, ORCID, RID
Čermáková, Lenka (UH-J) RID, ORCID, SAI
Cajthaml, Tomáš (MBU-M) RID, ORCID
Pivokonský, Martin (UH-J) SAI, ORCID, RIDSource Title Journal of Environmental Sciences. - : Science Press - ISSN 1001-0742
Roč. 79, May (2019), s. 25-34Number of pages 10 s. Publication form Print - P Language eng - English Country CN - China Keywords algal organic matter ; Chlorella vulgaris ; coagulation ; flocculation ; non-proteinaceous matter ; water treatment Subject RIV DJ - Water Pollution ; Quality OECD category Environmental sciences (social aspects to be 5.7) Subject RIV - cooperation Institute of Microbiology - Water Pollution ; Quality R&D Projects GA18-14445S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UH-J - RVO:67985874 ; MBU-M - RVO:61388971 UT WOS 000463378300003 EID SCOPUS 85055548524 DOI 10.1016/j.jes.2018.09.024 Annotation The removal of algal organic matter (AOM) is a growing concern for the water treatment industry worldwide. The current study investigates coagulation of non-proteinaceous AOM (AOM after protein separation), which has been minimally explored compared with proteinaceous fractions. Jar tests with either aluminum sulphate (alum) or polyaluminium chloride (PACl) were performed at doses of 0.2–3.0 mg Al per 1 mg of dissolved organic carbon in the pH range 3.0–10.5. Additionally, non-proteinaceous matter was characterized in terms of charge, molecular weight and carbohydrate content to assess the treatability of its different fractions. Results showed that only up to 25% of non-proteinaceous AOM can be removed by coagulation under optimized conditions. The optimal coagulation pH (6.6–8.0 for alum and 7.5–9.0 for PACl) and low surface charge of the removed fraction indicated that the prevailing coagulation mechanism was adsorption of non-proteinaceous matter onto aluminum hydroxide precipitates. The lowest residual Al concentrations were achieved in very narrow pH ranges, especially in the case of PACl. High-molecular weight saccharide-like organics were amenable to coagulation compared to low-molecular weight (< 3 kDa) substances. Their high content in non-proteinaceous matter (about 67%) was the reason for its low removal. Comparison with our previous studies implies that proteinaceous and non-proteinaceous matter is coagulated under different conditions due to the employment of diverse coagulation mechanisms. The study suggests that further research should focus on the removal of low-molecular weight AOM, reluctant to coagulate, with other treatment processes to minimize its detrimental effect on water safety. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2020 Electronic address https://www.sciencedirect.com/science/article/pii/S1001074218322460?via%3Dihub
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