Enhanced removal of dissolved natural organic matter by modified activated carbons

Wei Cheng, Tanju Karanfil, Yanping Guo, Seyed A. Dastgheib

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Enhanced removal of dissolved natural organic matter (DOM) by modified granular activated carbons (GACs) was studied. A granular activated carbon (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 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. GACs with higher mesoporosity and proper iron dispersion on the surface were expected to exhibit higher DOM uptakes from natural waters.

Original languageEnglish (US)
Title of host publicationAWWA 124th Annual Conference and Exposition
Subtitle of host publicationThe World's Water Event, ACE 2005
StatePublished - Dec 1 2005
Externally publishedYes
EventAWWA 124th Annual Conference and Exposition: The World's Water Event, ACE 2005 - San Francisco, CA, United States
Duration: Jun 12 2005Jun 16 2005

Publication series

NameAWWA 124th Annual Conference and Exposition: The World's Water Event, ACE 2005

Other

OtherAWWA 124th Annual Conference and Exposition: The World's Water Event, ACE 2005
CountryUnited States
CitySan Francisco, CA
Period6/12/056/16/05

ASJC Scopus subject areas

  • Water Science and Technology

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