摘要：Aiming at exploring the effect of initial arsenic concentration on sediment adsorption, at first, anorthogonal experiment of four factors and four levels was carried out to determine the optimalexperimental conditions. Based on orthogonal experiments, the single factor experiments of differentsampling times under the optimal experimental conditions were conducted to explore the influence ofthe initial arsenic concentration on adsorption of sediment of different concentrations. To confirm thearsenic’s adsorption equilibrium time, the experiments with different sediment concentrations wereconducted 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 sedimentadsorption of arsenic: temperature is 40°C, vibration velocity is 250 r·min -1 , pH is 9, and sedimentdiameter ranges from 0.15 to 0.3 mm; (2) when the sampling time and the sediment concentration areconstant, with the increase of initial arsenic concentration, the amount of the unit sediment adsorptionincreases gradually; when the concentration of the initial arsenic and sediment is constant, adsorptioncapacity of per unit mass of the sediment increases with time; (3) the time of arsenic adsorptionequilibrium from sediment is 60 mins.
