Arsenic() Removal by Granular Adsorbents Made from Backwashing Residuals from Biofilters for Iron and Manganese Removal - Details

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Abstract：

Granular　adsorbents　for　arsenic　removal　(GA)　made　from　the　backwashing　residuals　from　iron　and　manganese　removal　biofilters　for　groundwater　were　characterized　and　examined　as　an　arsenate　sorbent.　The　GA　were　characterized　by　SEM-EDS　microscopy,　X-ray　diffraction　(XRD),　and　BET　surface　area　measurement.　The　results　showed　that　the　GA　had　rough　surfaces,　developed　pores,　and　were　mainly　amorphous,　with　small　fractions　of　crystalline　quartz　and　hematite.　The　surface　area　of　the　GA,　which　consists　of　many　mesopores,　was　43.8　m2•g-1.　The　kinetic　studies　revealed　that　arsenate　adsorption　on　the　GA　was　described　by　a　pseudo-second-order　kinetic　equation,　and　the　Freundlich　isotherm　equation　fit　the　arsenate　adsorption　well　(R2=0.994).　The　maximum　adsorption　capacity　calculated　by　the　Langmuir　isotherm　equation　for　As()　was　5.05　mg•g-1.　Further　studies　showed　that　the　GA　operated　well　for　As()　removal　over　a　broad　range　in　pH　from　1.1　to　9.5.　The　coexistence　of　HCO3-　and　SO42-　had　no　great　influence　on　arsenic　adsorption,　while　the　H2PO4-　and　SiO32-　showed　negative　effects.　The　GA　can　be　regenerated　well,　and　82%　of　the　original　adsorption　capacity　was　maintained　after　three　regeneration　cycles.　©　2018,　Science　Press.　All　right　reserved.

Keyword：

Chemicals removal (water treatment) Biofilters Arsenic Kinetic theory Iron Adsorption Isotherms Pollution control Groundwater Hematite Integral equations

Author Community：

[ 1 ] [Zeng, Hui-Ping]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Colloge of Architecture and Civil Engineering, Beijing University of Technology, Beijing; 100124, China
[ 2 ] [Lü, Sai-Sai]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Colloge of Architecture and Civil Engineering, Beijing University of Technology, Beijing; 100124, China
[ 3 ] [Yang, Hang]State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin; 150090, China
[ 4 ] [Yin, Can]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Colloge of Architecture and Civil Engineering, Beijing University of Technology, Beijing; 100124, China
[ 5 ] [Cao, Rui-Hua]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Colloge of Architecture and Civil Engineering, Beijing University of Technology, Beijing; 100124, China
[ 6 ] [Wang, Yan-Ju]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Colloge of Architecture and Civil Engineering, Beijing University of Technology, Beijing; 100124, China
[ 7 ] [Li, Dong]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Colloge of Architecture and Civil Engineering, Beijing University of Technology, Beijing; 100124, China
[ 8 ] [Zhang, Jie]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Colloge of Architecture and Civil Engineering, Beijing University of Technology, Beijing; 100124, China
[ 9 ] [Zhang, Jie]State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin; 150090, China