Removal of arsenic from synthetic groundwater by adsorption using the combination of laterite and iron-modified activated carbon

Abstract

Groundwater is one of the most important sources for drinking water. Arsenic (As) contamination of groundwater is a serious problem worldwide, especially in Bangladesh, India and South East Asia. Adsorption using appropriate and readily available adsorbents is a promising method for the removal of arsenic with applicability in rural areas. This work aims to study the removal of arsenic from synthetic groundwater using an adsorption column by sequential combination of laterite (LA) and iron-modified activated carbon (AC-Fe) as adsorbents. The effect of ratio LA/AC-Fe, flow rate, initial arsenic concentration and pH to the breakthrough time were investigated. Adsorption equilibrium and adsorption kinetics were also studied through batch experiment. The result was found to be an efficient and feasible approach for arsenic treatment from groundwater for ready applicability in rural areas.

Fe-Grown Carbon Nanofibers for Removal of Arsenic(V) in Wastewater

“…From the equilibrium isotherms presented in Figure , we note that the loading of arsenic(V) ions on Fe-CNFs is 0.6−14 mg/g, corresponding to aqueous-phase arsenic(V) concentrations between 0.2 and 40 mg/L at pH 6.5. These values are comparable to 10 mg/g on FePO 4 (amorphous and crystalline), corresponding to 0.5−100 mg/L of arsenic at pH 6.0−6.7; 4.5 mg/g on the GAC-based iron-containing adsorbent at pH 5.0; 6.5 mg/g obtained for the cationic surfactant modified powered activated carbon corresponding to 10 mg/L of arsenic in water; and 1−4 mg/g on laterite and iron-modified activated carbon, corresponding to 0−4 mg/L of arsenic in water at pH 8.18 …”

“…Adsorption is suitable for the treatment of such water . Common adsorbents are iron- and aluminum-containing compounds such as hydrous ferric oxide; ferrihydrite; goethite; and activated alumina, zeolites, and sand. − Activated carbon granules and Fe-modified carbons have also been used. − Studies on the remediation of water containing arsenic at relatively high concentration levels (∼50 mg/L) are limited. Precipitation or coprecipitation is suitable for treating such water.…”

“…[9][10][11][12][13][14][15] Activated carbon granules and Fe-modified carbons have also been used. [16][17][18][19][20][21][22][23][24] Studies on the remediation of water containing arsenic at relatively high concentration levels (∼50 mg/L) are limited. Precipitation or coprecipitation is suitable for treating such water.…”

Leaching of arsenic in response to organic matter contamination in groundwater treatment practice

“…Several techniques were reported for the removal of arsenic from groundwater including physicochemical and biological treatments and membrane filtrations (Dang et al, 2008). Based on the established biological iron oxidation from groundwaters (Dimitrakos et al, 1992), arsenic removal by adsorption and co-precipitation onto the flocs of iron hydroxides and subsequent sand filtration has become a very popular technique.…”