Registration Dossier
Registration Dossier
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EC number: 432-240-0 | CAS number: 12056-51-8
Endpoint summary
Administrative data
Description of key information
Additional information
Removal of Titanium during waste water treatment processes.
Two literature publications have been reviewed and summarised, with respect to the removal efficiency of Titanium during waste wtaer treatment processes.
In one investigation, the concentrations of Titanium associated with particulate phases were quite high in activated sludge systems, in one treatment works investigated. It appears that Titanium has a tendency to adsorb into biosolids. As the biomass grows through consumption of soluble carbon and other nutrients, the new biomass also appears to accumulate Ti and other influent refractory solids. The secondary clarification system efficiently settled the biosoilds. These WWTP basics explain how and why Ti-bearing materials accumulate in activated sludge biosolids and secondary clarifier settled solids. It is asserted that the WWTP in which these investigations were conducted is likely to be representative of many WWTPs across the United States. The average overall removal of Ti for the June 2008 and January 2009 samplings was 82% (+/_ 21%).
In the second publication, results were reported of a more comprehensive investigation where samples were collected from 10 full-scale municipal WWTPs from southern to central Arizona (USA). The facilities ranged in size, with flows 0.1 to 7 m3/s. The WWTPs employed a range of different biological treatment processes: conventional activated sludge, trickling filter, microfiltration, membrane bioreactor, nitrification/denitrification, or various combinations. Grab samples were collected from the headworks and effluent (prior to disinfection) at each WWTP. The overrall removal efficiency was 96.1% to 99.4%, with an average removal of 98.3%.
Overall, these investigations strongly suggest that Titanium containing substances are very efficiently removed to solids during waste water treatment processes.
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