dc.contributor.advisor | Bandyopadhyay, Sulalit | |
dc.contributor.advisor | Ucar, Seniz | |
dc.contributor.author | Sørmo, Eirik | |
dc.date.accessioned | 2021-10-21T18:24:21Z | |
dc.date.available | 2021-10-21T18:24:21Z | |
dc.date.issued | 2021 | |
dc.identifier | no.ntnu:inspera:82941058:18643162 | |
dc.identifier.uri | https://hdl.handle.net/11250/2824821 | |
dc.description.abstract | Jern oxyhydroxide har blitt utfelt i en løsning sammen med fluorid i en Mixed-Suspension-Mixed-Product-Removal(MSMPR) Reaktor ved forskjellige temperaturer, oppholdstider og sulfat konsentrasjoner. Temperaturnivåene benyttet var 25°C og 60°C, oppholdstid nivåene var 30 min og 45 min, mens sulfat konsentrasjonene var 0, 10 and 20 g/L.
Virkningen disse parameterne hadde på utfellingen og fluorid adsorptionen ble studert.
Hvor krystallinsk utfellingen var, ble redusert med synkende temperaturer og økende sulfat konsentrasjoner. Utfellingen uten sulfat var 70-80 % akaganeite, mens utfellingen når sulfat konsentrasjonen var 20 g/L bestod kun av noen prosent akaganeite, mens det hadde en høy andel schwermannite.
Konsentrasjonen til fluorid i strømmen in til reaktoren var 100 mg/L. andelen som var igjen i filtratet varierte mellom 1.59 mg/L med en temperatur på 60°C, oppholdstid på 30 min
Og ikke noe sulfat, til 33.43 mg/L med en temperatur på 25°C, oppholdstid på 45 min og 20 g/L
sulfat. Hoved effekten til temperaturen og sulfat konsentrasjonen hadde en betydelig effekt, det samme hadde interaksjonene mellom dem | |
dc.description.abstract | Iron oxyhydroxides have been precipitated in the presence of fluoride using a Mixed-Suspension-Mixed-Product-Removal(MSMPR) Reactor at different temperatures, residence times and concentrations of sulphate. The levels of temperature used were 25°C and 60°C, the levels of residence time were 30 min and 45 min, while the sulphate concentrations were 0, 10 and 20 g/L.
The effect these parameters had on the precipitate and fluoride adsorption were studied.
The crystallinity of the precipitate decreased with decreasing temperature and increasing sulphate concentration. The precipitates without sulphate were 70-80 % akaganeite, while at a
sulphate concentration of 20 g/L, the precipitate were only a few per cent akaganeite, while it
had a high percentage of schwertmannite.
The concentration of fluoride in the flows entering the reactor where 100 mg/L. The amount
left in the filtrate varied between 1.59 mg/L at a temperature of 60°C, residence time of 30 min
and no sulphate, to 33.43 mg/L at a temperature of 25°C, residence time of 45 min and 20 g/L
of sulphate. It was determined that the main effect of temperature and sulphate concentration
were significant, and that they had a significant interaction. | |
dc.language | eng | |
dc.publisher | NTNU | |
dc.title | Fluoride Quantification and Removal from Industrial Process Streams | |
dc.type | Master thesis | |