Development of a portable filter for arsenic removal from drinking water
TL;DR: In this article, different grades of indigenously available activated alumina (AA) were screened for their arsenic removal capacity and the optimum pH for the adsorption phenomena was around 7.0.
Abstract: In the present study, different grades of indigenously available activated alumina (AA) were screened for their arsenic removal capacity. For both As(III) and As(V), A1 (Grade 1, 0.3-0.6 mm) activated alumina has shown better removal efficiency. The optimum pH for the adsorption phenomena was around 7.0. Chlorine at a dose of 20 mg/l could completely oxidize As(III) to As(V), which also assured the bacteriological quality of the water. Among various anions studied, sulfate seems to have maximum competition with arsenic for adsorption sites. A portable filter with a flow rate of 6 l/h and a contact time of 5 minutes could effectively be used for the treatment of arsenic contaminated water. The exhausted activated alumina could regenerate with 4% NaOH solution without much reduction in efficiency.
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Journal Article•
TL;DR: Although there were more pigmentation cases in exposed village compared to unexposed one, however, in comparison with other studies, rate of skin lesions (keratosis and pigmentation) were lower indicating that incidence ofSkin lesions will be minimal if exposure dose of arsenic through drinking water be less than 100 μg/l.
Abstract: Background & Objectives: Arsenic in drinking water is a well-known hazardous material that its pathogenesis has been reported by different researches. Present study was conducted as an epidemiological study for skin effects of exposure to low concentration of arsenic from drinking water. Materials and Methods: Present study was conducted as a cross sectional study in two exposed and unexposed villages to arsenic through drinking water (Sarab county: Razliq and Farkoosh villages, in 2012) and skin effects were studied among 279 persons over 10 years. Drinking water sources of both villages were analyzed chemically with an emphasis on arsenic. For statistical analysis of data, independent sample T-test was used and p value less than 0.05 was considered significant. Results: Arsenic concentration in drinking water of the exposed and unexposed villages was 96μg/l and zero, respectively. 9.7% of studied population had pigmentation (13.8% of exposed population, 6% of unexposed population). Odds ratio of pigmentation in the exposed village was calculated 2.5 fold higher than unexposed village (CI 95% = 1.0825.778). In the exposed village, keratosis just was observed in three persons (equal to 2.3% of village population) however, in unexposed village there was no keratosis. Conclusion: Although there were more pigmentation cases in exposed village compared to unexposed one, however, in comparison with other studies, rate of skin lesions (keratosis and pigmentation) were lower indicating that incidence of skin lesions will be minimal if exposure dose of arsenic through drinking water be less than 100 μg/l.
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References
More filters
Journal Article•
TL;DR: Although there were more pigmentation cases in exposed village compared to unexposed one, however, in comparison with other studies, rate of skin lesions (keratosis and pigmentation) were lower indicating that incidence ofSkin lesions will be minimal if exposure dose of arsenic through drinking water be less than 100 μg/l.
Abstract: Background & Objectives: Arsenic in drinking water is a well-known hazardous material that its pathogenesis has been reported by different researches. Present study was conducted as an epidemiological study for skin effects of exposure to low concentration of arsenic from drinking water. Materials and Methods: Present study was conducted as a cross sectional study in two exposed and unexposed villages to arsenic through drinking water (Sarab county: Razliq and Farkoosh villages, in 2012) and skin effects were studied among 279 persons over 10 years. Drinking water sources of both villages were analyzed chemically with an emphasis on arsenic. For statistical analysis of data, independent sample T-test was used and p value less than 0.05 was considered significant. Results: Arsenic concentration in drinking water of the exposed and unexposed villages was 96μg/l and zero, respectively. 9.7% of studied population had pigmentation (13.8% of exposed population, 6% of unexposed population). Odds ratio of pigmentation in the exposed village was calculated 2.5 fold higher than unexposed village (CI 95% = 1.0825.778). In the exposed village, keratosis just was observed in three persons (equal to 2.3% of village population) however, in unexposed village there was no keratosis. Conclusion: Although there were more pigmentation cases in exposed village compared to unexposed one, however, in comparison with other studies, rate of skin lesions (keratosis and pigmentation) were lower indicating that incidence of skin lesions will be minimal if exposure dose of arsenic through drinking water be less than 100 μg/l.
1 citations