||Arsenic (3) and arsenic (5) removal from drinking water in San Ysidro, New Mexico microfiche /
Clifford, D. ;
Lin, C. C.
||Environmental Protection Agency, Cincinnati, OH. Drinking Water Research Div.;Texas Univ. Health Science Center at Houston.
||US Environmental Protection Agency, Risk Reduction Engineering Laboratory
Potable water ;
Ground water ;
Chemical removal(Water treatment) ;
Water pollution ;
Mobile equipment ;
Ion exchanging ;
Aluminum oxide ;
Technology assessment ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||119 p. in various pagings ; 29 cm.
||The removal of a natural mixture of As(III) (31 micrograms/L) and As(V) (57 micrograms/L) from a groundwater high in total dissolved solids (TDS), and also containing fluoride (2.0 mg/L), was studied in San Ysidro, NM using the University of Houston (UH)/U.S. Environmental Protection Agency (EPA) Mobile Drinking Water Treatment Research Facility. The objective of the study was to establish a cost-effective means of removing As(III), As(V), and fluoride from this and similar waters. Arsenic adsorption into fine-mesh activated alumina gave better-than-expected results. Approximately 9000 bed volumes (BV) could be treated at pH 6 before the arsenic maximum contaminant level (MCL) (0.05 mg/L) was reached. At the natural pH of 7.2, however, only 1900 BV could be treated before exceeding the MCL. Reverse Osmosis (RO) treatment resulted in >97% arsenic removal and >94% TDS removal. Electrodialysis (ED) removed 73% of the arsenic and was able to meet the arsenic MCL on the City Water containing 89 micrograms/L total arsenic; however, ED removed only 28% of the As(III) from a new well containing 100% As(III) at a level of 230 micrograms/L. Chloride-form anion exchange also performed better-than-expected (200 BV) but not well enough for it to be considered seriously for treatment. Point-of-use (POU) RO treatment was effected in removing >91% of the arsenic and >94% of the TDS at low (<15%) water recovery.
||Sponsored by Texas Univ. Health Science Center at Houston.
|PUB Date Free Form
|Ti Tra Differently
||Arsenic 3. Arsenic 5.
||PC A06/MF A01
|OCLC Time Stamp
|OCLC Rec Leader
||00712nam 2200217Ka 45020