Arsenic removal household filter for small community

作者：Kumar Maji Sanjoy; Anjali Pal^*; Tarasankar Pal

来源：Research Journal of Chemistry and Environment, 2008, 12(1): 23-32.

• arsenic
• adsorption
• laterite soil
• isotherm
• logit model
• column design
• household filter

Natural adsorbent, laterite soil was selected and found to be an effective adsorbent for arsenic removal from arsenic bearing drinking water. The real arsenic bearing groundwater was collected from Nivedita Palli, 24 Paraganas, one of the arsenic affected areas of West Bengal. It was found that 20 g/L dose of the adsorbent removes similar to 98% of total arsenic from real arsenic bearing groundwater when the initial concentration was 0.33 mg/L with an agitation time and speed of 30 min and 170 rpm respectively. Isotherm study suggests that the removal capacity (0.18 mg/g) of the adsorbent is comparable with other natural adsorbents. Fixed bed column study was conducted to evaluate the column performance with the synthetic (using 20 cm. bed depth) as well as real (using 10 cm bed depth) arsenic bearing groundwater samples. The fixed bed was designed by logit model. The values of adsorption rate constant (K) and adsorption capacity (N(o)) were obtained as 0.3134, 0.7208, 1.21 L/(mg h) and 132.23, 70.81, and 69.22 mg/L for the minimum bed depth 13.89, 11.28 and 6.12 cm respectively for As(III) and As(V) and real sample. To get arsenic free water a domestic household filter "SANTA -2006" was designed with an earthen pitcher (kolsi). After continuous passing of 200.0 L of real sample of arsenic contaminated water under gravity, the breakthrough comes. The effluent water quality was tested. The results suggest that quality of water is acceptable for drinking purpose.

• 出版日期2008-3