Combining Ferric Salt and Cactus Mucilage for Arsenic Removal from Water

被引:34
作者
Fox, Dawn I. [2 ]
Stebbins, Daniela M. [1 ]
Alcantar, Norma A. [1 ]
机构
[1] Univ S Florida, Dept Chem & Biomed Engn, 4202 E Fowler Ave ENB 118, Tampa, FL 33620 USA
[2] Univ Guyana, Dept Chem, Turkeyen Campus, Greater Georgetown, Guyana
基金
美国国家科学基金会;
关键词
HOUSEHOLD DRINKING-WATER; IRON-OXIDE MINERALS; ADSORPTION; GROUNDWATER; WASTES; FERRIHYDRITE; COAGULATION; MECHANISM; DISPOSAL; FILTER;
D O I
10.1021/acs.est.5b04145
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
New methods to remediate arsenic-contaminated water continue to be studied, particularly to fill the need for accessible methods that can significantly impact developing communities. A combination of cactus mucilage and ferric (Fe(III)) salt was investigated as a flocculation coagulation system to remove arsenic (As) from water. As (V) solutions, ferric nitrate, and mucilage suspensions were mixed and left to stand for various periods of time. Visual and SEM observations confirmed the flocculation action of the mucilage as visible flocs formed and settled to the bottom of the tubes within 3 min. The colloidal suspensions without mucilage were stable for up to 1 week. Sample aliquots were tested for dissolved and total arsenic by ICP-MS and HGAFS. Mucilage treatment improved As removal (over Fe(III)-only treatment); the system removed 75-96% As in 30 min. At neutral pH, removal was dependent on Fe(III) and mucilage concentration and the age of the Fe(III) solution. The process is fast, achieving maximum removal in 30 min, with the majority of As removed in 10-15 min. Standard jar tests with 1000 mu g/L As(III) showed that arsenic removal and settling rates were pH-dependent; As removal was between 52% (high pH) and 66% (low pH).
引用
收藏
页码:2507 / 2513
页数:7
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