MARC 主機 00000nam  2200373   4500 
001    AAI3151883 
005    20061103104851.5 
008    061103s2005                        eng d 
020    9780496122059 
035    (UnM)AAI3151883 
040    UnM|cUnM 
100 1  Reddy, Pratap Gaddy 
245 10 Removal of arsenic from drinking water by iron oxide 
       coated pumice stone 
300    89 p 
500    Source: Dissertation Abstracts International, Volume: 65-
       11, Section: B, page: 5967 
500    Adviser: Charles D. Turner 
502    Thesis (Ph.D.)--The University of Texas at El Paso, 2005 
520    This research is aimed at a broad audience of rural 
       populations affected by drinking arsenic-contaminated 
       water. Exposure to arsenic in the drinking water has been 
       associated with the development of skin and internal 
       cancers and non-carcinogenic effects such as diabetes, 
       peripheral neuropathy, and cardiovascular disease 
       (Abernathy et al., 593--597). Traditional technologies to 
       remove arsenic from water include: coagulation and 
       filtration, activate alumina, ion-exchange, reverse 
       osmosis, and electro-dialysis. These methods are very 
       expensive to build and operate in rural areas with 
       scattered populations. The focus of this research was to 
       remove the arsenic from drinking water by a sorption 
       process. Batch studies were conducted on twelve adsorbent 
       materials with water containing 100 mug/L arsenic (V). The
       outcome of the research indicates that iron-oxide-coated 
       pumice stone (IOCPS) removes both arsenic (III) and 
       arsenic (V). The arsenic (V) appears to be more easily 
       removed than arsenic (III). In a laboratory column test, 
       the breakthrough volume of the iron oxide coated pumice 
       stone was 4000 bed volumes. The concentration of arsenic 
       in the feed water was 100 mug/L and the effluent 
       concentration was below detection limit (<2 mug/L). 
       Optimum empty bed contact time for arsenic (V) removal by 
       the iron oxide coated pumice stone was 8 to 10 minutes. 
       The optimum pH for arsenic removal by IOCPS was found to 
       be in the range of 5.5 to 6.0. The presence of sulfate, 
       chloride, nitrite, nitrate, and phosphate in the water 
       reduces the arsenic removal capacity of iron-oxide-coated 
       pumice stone. Presence of calcium, magnesium in the water 
       does not effect the arsenic removal by iron oxide coated 
       pumice stone. The residual waste is non-hazardous and can 
       be disposed in landfills 
590    School code: 0459 
590    DDC 
650  4 Engineering, Environmental 
650  4 Engineering, Civil 
650  4 Engineering, Sanitary and Municipal 
650  4 Environmental Sciences 
690    0775 
690    0543 
690    0554 
690    0768 
710 20 The University of Texas at El Paso 
773 0  |tDissertation Abstracts International|g65-11B 
856 40 |u