Open AccessImprovement of aqueous solution coexisting with arsenite and arsenate using iron mixed porous clay pellets in batch and fixed-bed column studies
Author(s) -
Nguyễn Chí Thành,
Boonchai Wichitsathian,
Chatpet Yossapol,
Watcharapol Wonglertarak,
Borano Te
Publication year - 2019
Publication title -
water science and technology water supply
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.318
H-Index - 39
eISSN - 1607-0798
pISSN - 1606-9749
DOI - 10.2166/ws.2019.069
Subject(s) - arsenate , arsenite , aqueous solution , pellets , saturation (graph theory) , freundlich equation , arsenic , chemistry , zerovalent iron , porosity , adsorption , langmuir , phosphate , chromatography , materials science , mathematics , composite material , organic chemistry , combinatorics
Arsenic-polluted water is a global concern and puts millions of people at risk of developing cancer. The improvement of aqueous solution coexisting with arsenite and arsenate using iron mixed porous clay pellets was investigated in batch and fixed-bed column systems. Batch studies showed that the removal rate occurred in two main phases with an equilibrium time of 52 h. The pseudosecond-order model well described the experimental data. Isotherm data were well fitted by the Langmuir–Freundlich model. The removal efficiency was significantly reduced in alkaline solution and the presence of phosphate ions. The column study revealed that the breakthrough time and saturation time increased with lower feeding flow rate, higher bed height, and lower initial adsorbate concentration. The Thomas model provided good performance for predicting the column
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