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. 2017 Sep 13;7(1):172.
doi: 10.1186/s13568-017-0478-y.

Study on the removal and transport and migration mechanism for As with activated sludge system

Jin Zhang  1 , Wei Wei  2 , Shuang Lin  2 , Jie Lu  2 , Qing Hu  2
Affiliations

Study on the removal and transport and migration mechanism for As with activated sludge system

Jin Zhang et al. AMB Express. .

Abstract

In this paper, the removal of As and the transport and migration of As at the process of activated sludge system was studied. The results showed that the activated sludge system has high removal efficiency for As, and the removal efficiency could be nearly 100%. The initial concentration of As has effect on the removal efficiency, and within the experimental scope, the increase of initial concentration of As improved the removal efficiency for As. The distribution of As in the surface and internal in activated sludge indicates that in the process of activated sludge, the As was first transferred from water to the surface of solid and was adsorbed by the surface and then transport to the interior of microbes and take part in some metabolisms of the microorganisms. The adsorption of As by activated sludge conforms to Freundlich adsorption isotherm, and the removal of As in activated sludge system follows to the pseudo second order reaction kinetics.

Keywords: Activated sludge system; As removal; Physical and biological adsorption; Transport mechanism.

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Figures

Fig. 1
Fig. 1
The removal efficiency for As with the activated sludge system
Fig. 2
Fig. 2
Removal kinetics for As with activated sludge
Fig. 3
Fig. 3
The distribution of As in continuous flow activated sludge reactor. CL concentration of As in water, CSS concentration of As in the surface of solid, CIS concentration of As in the interior of solid
Fig. 4
Fig. 4
The removal of As in continuous operation mode
Fig. 5
Fig. 5
The FT IR spectrum of activated sludge
Fig. 6
Fig. 6
Distribution of As between fluid phase and solid phase
See this image and copyright information in PMC

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