This paper discusses enhanced removal of dissolved natural organic matter (DOM) by modified granular
activated carbon (GAC). GAC was modified
by high temperature ammonia and steam treatment, respectively. Both techniques
increased the carbon mesoporosity and surface basicity. Adsorption isotherms indicated
that ammonia- and steam-treated carbons exhibited higher dissolved organic matter (DOM) uptake than the
precursor mainly due to the enlargement of carbon pores. Rapid small scale column tests
(RSSCTs) showed that steam treatment almost doubled the volume of treated water to
reach 50% breakthrough compared to the virgin GAC. Several iron impregnation
methods were used to load iron species on the carbon surface. Surface-area normalized
isotherms showed that some iron impregnated carbons had higher DOM uptake due to the
presence of iron species on the carbon surface. However, not all the iron species were
favorable for the adsorption. Iron oxidation state and particle size appear to be important.
GAC with higher mesoporosity and proper iron dispersion on the surface was expected
to exhibit higher DOM uptakes from natural waters. Includes 12 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 16 |
| Published : | 06/17/2005 |
