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Environmental Science and Pollution Research

, Volume 22, Issue 11, pp 8224–8234 | Cite as

Groundwater arsenic removal using granular TiO2: integrated laboratory and field study

  • Jinli Cui
  • Jingjing Du
  • Siwu Yu
  • Chuanyong JingEmail author
  • Tingshan ChanEmail author
Research Article

Abstract

High concentrations of arsenic (As) in groundwater pose a great threat to human health. The motivation of this study was to provide a practical solution for As-safe water in As geogenic areas using granular TiO2 (GTiO2). The kinetics results indicated that the As (III/V) adsorption on GTiO2 conformed to the Weber-Morris (WM) intraparticle diffusion model. The Langmuir isotherm results suggested that the adsorption capacities for As (III) and As (V) were 106.4 and 38.3 mg/g, respectively. Ion effect study showed that cationic Ca and Mg substantially enhanced As (V) adsorption, whereas no significant impact was observed on As (III). Silicate substantially decreased As (V) adsorption by 57 % and As (III) by 50 %. HCO3 remarkably inhibited As (V) adsorption by 52 %, whereas it slightly reduced As (III) adsorption by 8 %. Field column results demonstrated that ∼700 μg/L As was removed at an empty bed contact time (EBCT) of 1.08 min for 968 bed volumes before effluent As concentration exceeded 10 μg/L, corresponding to 0.96 mg As/g GTiO2. Two household filters loaded with 110 g GTiO2 in the on-off operational mode can provide 6-L/day As-safe drinking water up to 288 and 600 days from the groundwater containing ∼700 μg/L As and ∼217 μg/L As, respectively. Integration of batch experiments and column tests with systematic variation of EBCTs was successfully achieved using PHREEQC incorporating a charge distribution multisite complexation (CD-MUSIC) model and one-dimensional reactive transport block.

Keywords

Groundwater arsenic Granular TiO2 Adsorption Empty bed contact time CD-MUSIC PHREEQC XANES 

Notes

Acknowledgments

We thank Dr. David Parkhurst for the helpful discussion on PHREEQC modeling. We acknowledge the financial support of the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB14020201), the National Natural Science Foundation of China (41373123, 21337004), and RCEES (YSW2013A01).

Supplementary material

11356_2014_3955_MOESM1_ESM.docx (1.7 mb)
ESM 1 (DOCX 1764 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijingPeople’s Republic of China
  2. 2.Guizhou Electric Power Testing and Research InstituteGuiyangPeople’s Republic of China
  3. 3.National Synchrotron Radiation Research CenterHsinChuTaiwan

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