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Authors
Affiliations
1 Municipal Engineering, North China University of Water Resources and Electric Power,
Zhengzhou 450011, CN
Source
Nature Environment and Pollution Technology, Vol 16, No 2 (2017), Pagination: 627-632
Abstract
Aiming at exploring the effect of initial arsenic concentration on sediment adsorption, at first, an orthogonal experiment of four factors and four levels was carried out to determine the optimal experimental conditions. Based on orthogonal experiments, the single factor experiments of different sampling times under the optimal experimental conditions were conducted to explore the influence of the initial arsenic concentration on adsorption of sediment of different concentrations. To confirm the arsenic’s adsorption equilibrium time, the experiments with different sediment concentrations were conducted under the optimal experimental conditions, when sampling times respectively, were 5, 10, 15, 30, 45, 60, 90 and 120 mins. The results showed that (1) the optimal conditions for the sediment adsorption of arsenic: temperature is 40°C, vibration velocity is 250 r·min-1, pH is 9, and sediment diameter ranges from 0.15 to 0.3 mm; (2) when the sampling time and the sediment concentration are constant, with the increase of initial arsenic concentration, the amount of the unit sediment adsorption increases gradually; when the concentration of the initial arsenic and sediment is constant, adsorption capacity of per unit mass of the sediment increases with time; (3) the time of arsenic adsorption equilibrium from sediment is 60 mins.
Keywords
Arsenic, Sediment, Adsorption, Optimal Conditions, Adsorption Equilibrium.
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