Arsenic removal from high-arsenic water by enhanced coagulation with ferric ions and coarse calcite.

نویسندگان

  • S Song
  • A Lopez-Valdivieso
  • D J Hernandez-Campos
  • C Peng
  • M G Monroy-Fernandez
  • I Razo-Soto
چکیده

Arsenic removal from high-arsenic water in a mine drainage system has been studied through an enhanced coagulation process with ferric ions and coarse calcite (38-74 microm) in this work. The experimental results have shown that arsenic-borne coagulates produced by coagulation with ferric ions alone were very fine, so micro-filtration (membrane as filter medium) was needed to remove the coagulates from water. In the presence of coarse calcite, small arsenic-borne coagulates coated on coarse calcite surfaces, leading the settling rate of the coagulates to considerably increase. The enhanced coagulation followed by conventional filtration (filter paper as filter medium) achieved a very high arsenic removal (over 99%) from high-arsenic water (5mg/l arsenic concentration), producing a cleaned water with the residual arsenic concentration of 13 microg/l. It has been found that the mechanism by which coarse calcite enhanced the coagulation of high-arsenic water might be due to attractive electrical double layer interaction between small arsenic-borne coagulates and calcite particles, which leads to non-existence of a potential energy barrier between the heterogeneous particles.

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عنوان ژورنال:
  • Water research

دوره 40 2  شماره 

صفحات  -

تاریخ انتشار 2006