Ding Wencheng, Yan Fengdong, Zhao Hongwei, Ding Aizhong, Zhang Guoli. Analysis on absorbents for sorption characteristic and factors affecting As(Ⅴ) removal from drinking water[J]. Chinese Journal of Environmental Engineering, 2013, 7(3): 873-878.
| Citation: |
Ding Wencheng, Yan Fengdong, Zhao Hongwei, Ding Aizhong, Zhang Guoli. Analysis on absorbents for sorption characteristic and factors affecting As(Ⅴ) removal from drinking water[J]. Chinese Journal of Environmental Engineering, 2013, 7(3): 873-878.
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Analysis on absorbents for sorption characteristic and factors affecting As(Ⅴ) removal from drinking water
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1.
Beijing Key Laboratory for Risk Modeling and Remediation of Contaminated Site, Key Laboratory for Groundwater Pollution Control and Remediation, Ministry of Education, College of Water Sciences, Beijing Normal University, Beijing 100875, China
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2.
Tianjin Hydrology & Water Resources Survery Administration Center, Tianjin 300061,China
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3.
Tianjin Port Free Trade Zone Environmental Protection Bureau, Tianjin 300308, China
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Received Date:
04/07/2011
Accepted Date:
28/03/2011
Available Online:
18/03/2013
Fund Project:
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Abstract
Batch experiments were conducted to investigate the sorption characteristic and the factors affecting As(Ⅴ) removal from drinking water for activated alumina, zero-valent iron and iron-oxide coated zeolite (IOCZ). The experimental results suggest that the highest As(Ⅴ) removal efficiency of activated alumina, zero-valent iron and IOCZ was reached after 90 min, 150 min and 90 min, respectively. The adsorption of As(Ⅴ) on Activated alumina, zero-valent iron and IOCZ was found to follow the Langmuir isotherm. The maximal sorption capacity of activated alumina, zero-valent iron and IOCZ was 7.3 mg/g, 3.3 mg/g and 3.9 mg/g, respectively with the dosage of absorbents were 2 g/L, the initial concentration of As(Ⅴ) was 1 mg/L, the pH value was 6.5, at 25℃. The As(Ⅴ) removal efficiency from the drinking water is dramatically affected by pH value and competitive ions. The removal efficiency of As(Ⅴ) can be increased by the decreasing the pH value. the presence of phosphate decreased the efficiency of arsenic removal for both batch activated alumina, and zero-valent iron; while the presence of silicate decreased the efficiency of arsenic removal for both zero-valent iron and IOCZ.
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