How algal organic matter affects coagulation of other impurities present in surface waters

0489943 - ÚH 2021 RIV eng A - Abstract
Barešová, Magdalena - Načeradská, Jana - Novotná, Kateřina - Pivokonská, Lenka - Pivokonský, Martin
How algal organic matter affects coagulation of other impurities present in surface waters.
2018.
[UK-IWA Young Water Professionals Conference /19./. 16.04.2018-18.04.2018, Cranfield]
R&D Projects: GA ČR(CZ) GA18-14445S
Institutional support: RVO:67985874
Keywords : algal organic matter * coagulation * cyanobacterial cells * humic substances * kaolin
OECD category: Environmental sciences (social aspects to be 5.7)

Drinking water treatment (DWT) is facing an adverse impact of algae especially when they extensively decay and release cellular organic matter (COM). Algal organic matter (AOM) has been usually reported to interfere with coagulation that seems to be a cost-effective prerequisite for the efficient performance of all down-stream processes (Henderson et al., 2010). Despite low treatability of AOM, owing to its variable features AOM exhibits both favourable and adverse effects on the removal of other impurities (Bernhardt et al., 1985). Research into the impact of AOM on coagulation of other particles or molecules has preferably dealt with coagulation of algal cells in the presence of extracellular organic matter released via metabolic activity into the culture media (Vandamme et al., 2012, Garzon-Sanabria et al., 2013) or as a drawback of pre-oxidation (Ma and Liu, 2002, Ma et al., 2012). What has not received much attention so far is coagulation of COM released after cell lysis, which may form a majority of dissolved natural organic matter contained in water sources (Henderson et al., 2008). As COM is not only difficult to coagulate, but also hinders coagulation of other substances, the study investigates the impact of COM derived from two common cyanobacterial species Microcystis aeruginosa and Merismopedia tenuissima on removability of other impurities naturally occurring in surface waters: kaolin, humic substances (HS) and cyanobacterial cells of M. tenuissima by means of coagulation/flocculation as the essential and simultaneously most vulnerable step in the overall solid-liquid separation scheme in DWT.
Permanent Link: http://hdl.handle.net/11104/0284238