Arsenic removal from high-arsenic water by enhanced coagulation with ferric ions and coarse calcite.
Water Res
; 40(2): 364-72, 2006 Jan.
Article
em En
| MEDLINE
| ID: mdl-16352327
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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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Arsênio
/
Poluentes da Água
/
Purificação da Água
Idioma:
En
Revista:
Water Res
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
México
País de publicação:
Reino Unido