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Coagulating different fractions of algal organic matter
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SYSNO ASEP 0504381 Document Type A - Abstract R&D Document Type O - Ostatní Title Coagulating different fractions of algal organic matter Author(s) Novotná, Kateřina (UH-J) SAI, ORCID, RID
Čermáková, Lenka (UH-J) RID, ORCID, SAI
Pivokonský, Martin (UH-J) SAI, ORCID, RIDArticle number 14331 Source Title Geophysical Research Abstracts, EGU General Assembly 2018, Vol. 21. - Göttingen : European Geosciences Union, 2019 Number of pages 1 s. Publication form Online - E Action EGU General Assembly 2019 Event date 07.04.2019 - 12.04.2019 VEvent location Vienna Country AT - Austria Event type WRD Language eng - English Country DE - Germany Keywords algal organic matter ; coagulation ; non-proteinaceous matter ; peptides-proteins ; water treatment Subject RIV DJ - Water Pollution ; Quality OECD category Environmental sciences (social aspects to be 5.7) R&D Projects GA18-14445S GA ČR - Czech Science Foundation (CSF) Institutional support UH-J - RVO:67985874 Annotation Removal of undesirable algal organic matter (AOM) is of growing concern for drinking water treatment plants worldwide. This study investigates coagulation of different AOM fractions, i.e. AOM peptides-proteins and non-proteinaceous compounds. Coagulation conditions were optimized for each fraction separately (with using Al2(SO4)3 18 H2O as a coagulant) and the results were compared. Initial concentration of AOM was set to 5 mg/L DOC (dissolved organic carbon) for all the coagulation experiments. While good removal efficiencies (up to approximately 80%) were obtained for peptides-proteins by relatively low doses of coagulant (corresponding to 2 mg/L Al), non-proteinaceous fraction appeared to be difficult to coagulate (efficiency not exceeding 25%), even at high doses of coagulant (15 mg/L Al). Optimal coagulation pH (at which maximum AOM removal was obtained and residual Al concentrations were the lowest) also differed (pH values of 5.2-6.7 and 7.1-7.5 for peptides-proteins and non-proteinaceous fraction, respectively), which points out to the employment of different coagulation mechanisms. Also pre-hydrolyzed coagulant (polyaluminium chloride) was tested for coagulation of non-proteinaceous fraction, however, the efficiency did not increase and the optimum pH was shifted to even higher values (7.6-8.0). Additionally, both the AOM fractions were subjected to characterization in terms of their molecular weight (MW) and charge. These properties are important from the perspective of coagulation and contribute to elucidate its mechanisms. Moreover, the proportion of carbohydrates was determined in non-proteinaceous fraction. In general, low-MW compounds were less amenable to coagulation and their high content in non-proteinaceous matter (about 70% under 3 kDa) was among the reasons for its low removal. By contrast, high-MW proteins and high-MW carbohydrates were completely removed by coagulation. To conclude, the results imply that the AOM character significantly influence the process of coagulation in later treatment and that specific AOM fractions, reluctant to coagulate, require involvement of other treatment processes to avoid their detrimental effects on drinking water quality. Workplace Institute of Hydrodynamics Contact Soňa Hnilicová, hnilicova@ih.cas.cz, Tel.: 233 109 003 Year of Publishing 2020
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