Arsenic and Fluoride Removal Using Simple Materials

作者：Mlilo T B; Brunson L R; Sabatini D A

来源：Journal of Environmental Engineering, 2010, 136(4): 391-398.

DOI：10.1061/(ASCE)EE.1943-7870.0000154

Since many at risk to arsenic and fluoride contamination cannot afford or do not have access to modern, centralized water treatment facilities, simple and low-cost solutions must be found. Bone char, goethite coated sand (G-IOCS) and hematite coated sand (H-IOCS) were evaluated for treating water with elevated levels of arsenic and fluoride present individually or together. Results obtained were compared to conventional media used in developed countries; activated alumina and granular ferric oxide. Fluoride adsorption capacity was higher in bone char than in G-IOCS and H-IOCS. Fluoride removal was not affected by the presence of environmentally significant arsenic (III) and arsenic (V) concentrations. On a mass basis, bone char's fluoride adsorption capacity was comparable to that of activated alumina both in the presence and absence of 0.25 mg/L of arsenic (III) and arsenic (V) in solution. Bone char also showed higher capacity to remove arsenic (III) and arsenic (V) from solution than both G-IOCS and H-IOCS, likely due to its much higher surface area. The 10 mg/L of fluoride did compete with arsenic (V) for adsorption onto the bone char. Both G-IOCS and H-IOCS removed arsenic (III) from solution even in the presence of fluoride; however, G-IOCS had higher arsenic (III) adsorption capacity than H-IOCS, possibly as a result of higher surface area of goethite coated onto the sand. On a mass basis, the bone char and iron oxide coated sands were two to three orders of magnitude less efficient in removing arsenic (III) and arsenic (V) than a commercially produced granular ferric oxide.

• 出版日期2010-4