In:
Water Environment Research, Wiley, Vol. 67, No. 3 ( 1995-05), p. 355-363
Abstract:
The removal of organic contaminants from water by adsorption processes results in spent adsorbents, and, in this research, the use of homogeneous advanced oxidation processes for destructive regeneration of adsorbents is investigated.
These two homogeneous advanced oxidation processes are examined: hydrogen peroxide/ozone and ultraviolet light/hydrogen peroxide. The impacts of adsorbent, adsorbate, and temperature on regeneration were examined. The process was evaluated by the destruction efficiency, rate of regeneration, and the quantity of oxidants consumed.
This study demonstrates that the regeneration of adsorbents by homogeneous advanced oxidation is not practical. This paper does not suggest other advanced oxidation processes that employ Fentons reagant or heterogeneous reactions using photoreactive metal catalysts (that is, TiO 2 ) are ineffective for regeneration of adsorbents. The regeneration rate was found to be much faster for smaller particle size adsorbents and weakly adsorbed compounds; in some cases, nearly 100% of the virgin capacity was recovered after regeneration. However, in all cases, the regeneration process consumes more oxidants than would be required by simply using a conventional advanced oxidation process for destroying organic contaminants. The high consumption of oxidants may be due to the slow rate of organic desorption and redox reactions with the adsorbent surface. Accordingly, regeneration processes using homogeneous advanced oxidation is not practical unless an adsorbent is developed that exhibits fast desorption kinetics and the surface does not react with the oxidants.
Type of Medium:
Online Resource
ISSN:
1061-4303
,
1554-7531
DOI:
10.2175/106143095X131583
Language:
English
Publisher:
Wiley
Publication Date:
1995
detail.hit.zdb_id:
1098976-6
detail.hit.zdb_id:
2051010-X
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