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Li, Hai-Hua
- Influence of Coexistent Ions Fe3+ and Mn2+ on Arsenic (III) Adsorption Behaviour onto River Sediment
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Authors
Affiliations
1 North China University of Water Resources and Electric Power, Zhengzhou, 450011, CN
1 North China University of Water Resources and Electric Power, Zhengzhou, 450011, CN
Source
Nature Environment and Pollution Technology, Vol 15, No 1 (2016), Pagination: 305-310Abstract
To understand the influencing factors of the sediment adsorption of As3+, prototype sand of the Yellow River was taken as the material. The effects of sediment adsorption saturation time and adsorption regularities were investigated when coexisting ions Fe3+ and Mn2+ existed. The results show that: (1) when there was only As3+ existing alone, the saturation time was 60 min; when Fe3+ and Mn2+ were added, the saturation time was 90 min; (2) when Fe3+ existed, the sediment adsorption laws of As3+ were as follows: during the initial period, with the increasing concentration of Fe3+, the adsorption decreased; when the concentration of Fe3+ was more than 0.4mg/L, the adsorption capacity increased with the increasing concentration of Fe3+; when there was Mn2+ existing, the regulation also showed that it initially decreased slightly and then increased, i.e., when Mn2+ was less than 1.0mg/L, the adsorption capacity decreased with the increasing concentration of Mn2+; when Mn2+ was higher than 1.0mg/L, the adsorption capacity increased with the increasing concentration of Mn2+; when Fe3+ and Mn2+ coexisted, the sediment adsorption of As3+ increased with the increasing concentration of the coexisting ions; (3) when the coexisting ion concentration was 0.2-0.4mg/L, the removal rate of Fe3+ was less than that of Mn2+, and also less than that of the coexistence of Fe3+ and Mn2+. When the concentration of coexistent ions is less than 0.2 or more than 0.4 mg/L, the removal rate of Mn2+ was less than Fe3+, and also less than that of the coexistence of Fe3+ and Mn2+.Keywords
As(III), Sediment Sorption, Coexisting Ions, Fe, Mn.- Study on Arsenic (III) Sorption Behaviour by River Sediment
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Authors
Affiliations
1 Key Laboratory of Northwest Water Resources and Environment Ecology of MOE at Xi’an University of Technology, Xi’an 710048, CN
2 Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN
1 Key Laboratory of Northwest Water Resources and Environment Ecology of MOE at Xi’an University of Technology, Xi’an 710048, CN
2 Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN
Source
Nature Environment and Pollution Technology, Vol 13, No 2 (2014), Pagination: 339-344Abstract
The present study deals with sediment sorption of arsenic onto sediments from the middle Yellow River and major affecting factors (such as temperate, pH, particle size and sediment dose have been studied by isothermal sorption and single factor experiments. The results showed that sorption equilibrium time of each dose and particle size sediment was 5-10 min. expect 1kg/m3. When the sediment dose was 1kg/m3, the sorption equilibrium time was about 180min. The retention rate of As(III) increased with respect to sediment dose while the retention quality of per sediment decreased. As the sediment concentrations are the same, the smaller the particle size, the more the retention quality. The order for sorption As(III) was fine sediment>medium sediment>coarse sediment. When pH>7, the percentage of As (III) removal was higher compared to pH 7. A general increase was there in sorption with respect to pH above 7.0 for both the fractions of the sediment. It is evident that the pH for minimum uptake of As (III) is 7.0, and for maximum uptake is 9.0. At the same time, temperate as the main factor for sorption was also studied. The temperate experiments showed that the temperature is of significance to sorption. When temperatures between 10-15°C, the higher the temperature, the lower the removal rate. When temperatures between 15-20°C, the higher the temperature, the bigger the removal rate. After temperature greater than 20°C, temperature change effects on arsenic sorption rates do not remain obvious.Keywords
Arsenic (III), River Sediment, Sorption, pH, Temperature.- Effect of Initial Arsenic Concentration on Sediment Adsorption of Arsenic
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Authors
Affiliations
1 Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN
1 Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN