Iron-impregnated granular activated carbon for arsenic removal: Application to practical column filters.
J Environ Manage
; 239: 235-243, 2019 Jun 01.
Article
em En
| MEDLINE
| ID: mdl-30903835
Arsenic is a major drinking water contaminant in many countries causing serious health hazards, and therefore, attempts are being made to remove it so that people have safe drinking water supplies. The effectiveness of arsenic removal from As(V) solutions using granular activated carbon (GAC) (zero point of charge (ZPC) pH 3.2) and iron incorporated GAC (GAC-Fe) (ZPC pH 8.0) was studied at 25⯱â¯1⯰C. The batch study confirmed that GAC-Fe had higher Langmuir adsorption capacity at pH 6 (1.43â¯mg As/g) than GAC (1.01â¯mg As/g). Adsorption data of GAC-Fe fitted the Freundlich model better than the Langmuir model, thus indicating the presence of heterogeneous adsorption sites. Weber and Morris plots of the kinetic adsorption data suggested intra-particle diffusion into meso and micro pores in GAC. The column adsorption study revealed that 2-4 times larger water volumes can be treated by GAC-Fe than GAC, reducing the arsenic concentration from 100⯵g/L to the WHO guideline of 10⯵g/L. The volume of water treated increased with a decrease in flow velocity and influent arsenic concentration. The study indicates the high potential of GAC-Fe to remove arsenic from contaminated drinking waters in practical column filters.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Arsênio
/
Poluentes Químicos da Água
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Purificação da Água
Tipo de estudo:
Guideline
Idioma:
En
Ano de publicação:
2019
Tipo de documento:
Article