Manganese removal by newly synthesized TiO2-based adsorbent during drinking water treatment

0560372 - ÚH 2023 RIV NO eng C - Konferenční příspěvek (zahraniční konf.)
Fialová, Kateřina - Motlochová, Monika - Čermáková, Lenka - Novotná, Kateřina - Pivokonský, Martin
Manganese removal by newly synthesized TiO2-based adsorbent during drinking water treatment.
Proceedings Water safety conference 2022. Narvik: IWA, 2022.
[The 2022 IWA International conference for water safety. Narvik (NO), 22.06.2022-24.06.2022]
Grant ostatní: AV ČR(CZ) StrategieAV21/20
Program: StrategieAV
Institucionální podpora: RVO:67985874 ; RVO:61388980
Klíčová slova: adsorption * drinking water treatment * ion-exchange * manganese * titanium dioxide
Obor OECD: Environmental sciences (social aspects to be 5.7); Inorganic and nuclear chemistry (UACH-T)

Manganese (Mn) is a natural element commonly occurring in many water resources, especially in groundwaters. However, its presence in drinking water is undesirable and causes several operational and aesthetic problems and health risks. Mn concentrations in water exceeding only 0.1 mg L−1 already negatively affect its organoleptic properties, especially taste, odour, and colour (Griffin, 1960). Increased concentration of Mn might be an undesirable nutrient substrate for the development of bacteria in water distribution networks (Casey, 2009). From these findings, it is clear that maintaining acceptable concentrations of this element in drinking water is of great importance. Conventional methods used for demanganization are based on the conversion of soluble Mn2+ to insoluble removable precipitates. In theory, oxidation of Mn2+ can be achieved by atmospheric oxygen via mechanical aeration of water, but the oxidation rate is very slow and pH dependent, and alkalization is necessary to enhance the process (Hem, 1963). Among other methods of Mn removal are adsorption or cation-exchange. Most adsorbents are more or less efficient for Mn removal from aqueous solution, but the required dose is mostly very high, which makes these methods expensive. However, the newly synthesized TiO2-based adsorbent showed recently a very high efficiency for heavy metals or selected radionuclides (Motlochova et al., 2019,2020), therefore, it is expected to be effective for Mn2+ removal as well. This research aimed to assess its efficiency for Mn2+ removal and investigate the effects of solution conditions such as pH and the presence of co-existing ions on Mn2+ removal.
Trvalý link: https://hdl.handle.net/11104/0333304