Regeneration of adsosrbents using heterogeneous photocatalytic oxidation

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Journal of Environmental Engineering

DOI:https://doi.org/10.1061/(ASCE)0733-9372(1996)122:8(707)· OSTI ID:287537

Liu, J; Crittenden, J C; Hand, D W; Perram, D L ^[1]

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1. Michigan Technological Univ., Houghton, MI (United States). Dept. of Civil and Environmental Engineering

The overall objective of this study is to investigate the technical feasibility of removal and destruction of organic contaminants in water using adsorption and photocatalytic oxidation. The process consists of two consecutive operational steps: (1) removal of organic contaminants using fixed-bed adsorption; and (2) regeneration of the spent adsorbent using photocatalytic regeneration. To facilitate the regeneration, some of the adsorbents were impregnated with photocatalysts, which would allow them to act as both an adsorbent for capturing the organics and a photocatalyst for destroying the organics during regeneration. Laboratory-scale adsorption processes were conducted using rapid small-scale column tests (RSSCTs) for the loading of F-400 GAC (60x80) and Ambersorb 563 (60x80) with trichloroethene (TCE) and para-dichlorobenzene (p-DCB), respectively. The spent adsorbents were regenerated in a plate photoreactor and the organic-free water was used. For the impregnated F-400 carbon, catalyst loading was observed to have little impact on the adsorption capacity for TCE. The Pt-TiO{sub 2} impregnated F-400 carbon loaded with TCE (1,000 {micro}g/L) could be regenerated using artificial light with a regeneration time identical to the adsorption time. About 30% loss in capacity was observed during the four adsorption/regeneration cycles. For Pt-TiO{sub 2} impregnated Ambersorb 563, the capacity loss from the first regeneration was about 40% and no further loss was observed for the remaining adsorption/regeneration cycles.

• Sponsoring Organization: USDOE
• OSTI ID: 287537
• Journal Information: Journal of Environmental Engineering, Journal Name: Journal of Environmental Engineering Journal Issue: 8 Vol. 122; ISSN 0733-9372; ISSN JOEEDU
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
54 ENVIRONMENTAL SCIENCES
ADSORBENTS
CATALYSTS
CHLORINATED ALIPHATIC HYDROCARBONS
FEASIBILITY STUDIES
INDUSTRIAL WASTES
PHOTOCHEMICAL REACTIONS
RECYCLING
REMEDIAL ACTION
REMOVAL
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER