Elimination of Micropollutants during Post-Treatment
of Hospital Wastewater with Powdered Activated Carbon, Ozone, and
UV
Lubomira Kovalova
Hansruedi Siegrist
Urs von Gunten
Jakob Eugster
Martina Hagenbuch
Anita Wittmer
Ruedi Moser
Christa S. McArdell
10.1021/es400708w.s001
https://acs.figshare.com/articles/journal_contribution/Elimination_of_Micropollutants_during_Post_Treatment_of_Hospital_Wastewater_with_Powdered_Activated_Carbon_Ozone_and_UV/2395993
A pilot-scale hospital wastewater
treatment plant consisting of
a primary clarifier, membrane bioreactor, and five post-treatment
technologies including ozone (O<sub>3</sub>), O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub>, powdered activated carbon (PAC), and low pressure
UV light with and without TiO<sub>2</sub> was operated to test the
elimination efficiencies for 56 micropollutants. The extent of the
elimination of the selected micropollutants (pharmaceuticals, metabolites
and industrial chemicals) was successfully correlated to physical-chemical
properties or molecular structure. By mass loading, 95% of all measured
micropollutants in the biologically treated hospital wastewater feeding
the post-treatments consisted of iodinated contrast media (ICM). The
elimination of ICM by the tested post-treatment technologies was 50–65%
when using 1.08 g O<sub>3</sub>/gDOC, 23 mg/L PAC, or a UV dose of
2400 J/m<sup>2</sup> (254 nm). For the total load of analyzed pharmaceuticals
and metabolites excluding ICM the elimination by ozonation, PAC, and
UV at the same conditions was 90%, 86%, and 33%, respectively. Thus,
the majority of analyzed substances can be efficiently eliminated
by ozonation (which also provides disinfection) or PAC (which provides
micropollutants removal, not only transformation). Some micropollutants
recalcitrant to those two post-treatments, such as the ICM diatrizoate,
can be substantially removed only by high doses of UV (96% at 7200
J/m<sup>2</sup>). The tested combined treatments (O<sub>3</sub>/H<sub>2</sub>O<sub>2</sub> and UV/TiO<sub>2</sub>) did not improve the
elimination compared to the single treatments (O<sub>3</sub> and UV).
2013-07-16 00:00:00
pressure UV light
PAC
elimination efficiencies
membrane bioreactor
56 micropollutants
micropollutants removal
UVA
Powdered Activated Carbon
Hospital Wastewater
ICM diatrizoate
contrast media
mass loading
O 3
UV dose
TiO 2
hospital wastewater