TY - JOUR
T1 - Removal of arsenic from water using Fe-exchanged natural zeolite
AU - Li, Zhaohui
AU - Jean, Jiin Shuh
AU - Jiang, Wei Teh
AU - Chang, Po Hsiang
AU - Chen, Chun Jung
AU - Liao, Libing
N1 - Funding Information:
Funding from Wisconsin Groundwater Research Council, and from National Cheng Kung University (NCKU) , Taiwan, for the project of Promoting Academic Excellence & Developing World Class Research Centers to support Li's short term visit to NCKU, is greatly appreciated.
PY - 2011/3/15
Y1 - 2011/3/15
N2 - An elevated arsenic (As) content in groundwater imposes a great threat to people worldwide. Thus, developing new and cost-effective methods to remove As from groundwater and drinking water becomes a priority. Using iron/aluminum hydroxide to remove As from water is a proven technology. However, separation of As-bearing fine particles from treated water presented a challenge. An alternative method was to use coarse-grained sorbents to increase the flow rate and throughput. In this research, a natural zeolite (clinoptilolite) was exchanged with iron(III) to enhance its As removal. Batch test results showed a Fe(III) sorption capacity of 144. mmol/kg on the zeolite. The As sorption on the Fe-exchanged zeolite (Fe-eZ) could reach up to 100. mg/kg. Columns packed with Fe-eZ were tested for As removal from water collected from acid mine drainage (AMD) and groundwater containing high natural organic matter and high As(III). With an initial concentration of 147 μg/L in the AMD water, a complete As removal was achieved up to 40 pore volumes. However, the Fe-eZ was not effective to remove As from Chia-Nan Plain groundwater due to its high initial As concentration (511 μg/L), high amounts of natural organic matter, as well as its low oxidation-reduction potential, under which the As was in reduced As(III) form.
AB - An elevated arsenic (As) content in groundwater imposes a great threat to people worldwide. Thus, developing new and cost-effective methods to remove As from groundwater and drinking water becomes a priority. Using iron/aluminum hydroxide to remove As from water is a proven technology. However, separation of As-bearing fine particles from treated water presented a challenge. An alternative method was to use coarse-grained sorbents to increase the flow rate and throughput. In this research, a natural zeolite (clinoptilolite) was exchanged with iron(III) to enhance its As removal. Batch test results showed a Fe(III) sorption capacity of 144. mmol/kg on the zeolite. The As sorption on the Fe-exchanged zeolite (Fe-eZ) could reach up to 100. mg/kg. Columns packed with Fe-eZ were tested for As removal from water collected from acid mine drainage (AMD) and groundwater containing high natural organic matter and high As(III). With an initial concentration of 147 μg/L in the AMD water, a complete As removal was achieved up to 40 pore volumes. However, the Fe-eZ was not effective to remove As from Chia-Nan Plain groundwater due to its high initial As concentration (511 μg/L), high amounts of natural organic matter, as well as its low oxidation-reduction potential, under which the As was in reduced As(III) form.
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U2 - 10.1016/j.jhazmat.2011.01.030
DO - 10.1016/j.jhazmat.2011.01.030
M3 - Article
C2 - 21315510
AN - SCOPUS:79951853412
SN - 0304-3894
VL - 187
SP - 318
EP - 323
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
IS - 1-3
ER -