Arsenic removal by iron oxide coated sponge: treatment and waste management.
One of the problems in drinking water that raises concern over the world is that millions of people still have to use arsenic-contaminated water. There is a worldwide need to develop appropriate technologies to remove arsenic from water for household and community water supply systems. In this study, a new material namely iron oxide coated sponge (IOCSp) was developed and used to remove arsenic (As) from contaminated groundwater in Vietnam. The results indicated that IOCSp has a high capacity in removing both As (V) and As (III). The adsorption capacity of IOCSp was up to 4.6 mg As/g IOCSp, showing better than many other materials. It was observed from a pilot study that a small quantity of IOCSp (180 g) could reduce As concentration of 480 microg/L in 1.5 m3 of contaminated natural water to below 40 microg/L. In addition, an exhausted IOCSp, containing a large amount of arsenic (up to 0.42 wt %) could safely be disposed through the solidification/stabilization with cement. Addition of fly ash also reduced the amount of arsenic in the leachate.
Nguyen
Tien Vinh
TV
Faculty of Engineering, University of Technology, Sydney (UTS), PO Box 123, Broadway, Sydney NSW 2007, Australia.
Rahman
Abdur
A
Vigneswaran
Saravanamuthu
S
Ngo
Huu Hao
HH
Kandasamy
Jaya
J
Nguyen
Duc Tho
DT
Do
Tuan Anh
TA
Nguyen
Trung Kien
TK
D000327:Adsorption; D001151:Arsenic / Q000737:chemistry* / Q000302:isolation & purification*; D005290:Ferric Compounds / Q000737:chemistry*; D011140:Polyurethanes / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D005290:Ferric Compounds; D011140:Polyurethanes; D014874:Water Pollutants, Chemical; D014867:Water; C000499:ferric oxide; D001151:Arsenic