Statistical optimization of arsenic removal from synthetic water by electrocoagulation system and its application with real arsenic-polluted groundwater.
Environ Technol
; 42(22): 3463-3474, 2021 Sep.
Article
em En
| MEDLINE
| ID: mdl-32072869
ABSTRACT
Arsenic presence in the water has become one of the most concerning environmental problems. Electrocoagulation is a technology that offers several advantages over conventional treatments such as chemical coagulation. In the present work, an electrocoagulation system was optimized for arsenic removal at initial concentrations of 100â
µg/L using response surface methodology. The effects of studied parameters were determined by a 23 factorial design, whereas treatment time had a positive effect and current intensity had a negative effect on arsenic removal efficiency. With a p-value of 0.1629 and a confidence of level 99%, the type of electrode material did not have a significant effect on arsenic removal. Efficiency over 90% was reached at optimal operating conditions of 0.2â
A of current intensity, and 7â
min of treatment time using iron as the electrode material. However, the time necessary to accomplish with OMS arsenic guideline of 10â
µg/L increased from 7 to 30â
min when real arsenic-contaminated groundwater with an initial concentration of 80.2 ± 3.24â
µg/L was used. The design of a pilot-scale electrocoagulation reactor was determined with the capacity to meet the water requirement of a 6417 population community in Sonora, Mexico. To provide the 1.0â
L/s required, an electrocoagulation reactor with a working volume of 1.79â
m3, a total electrode effective surface of 701â
m2, operating at a current intensity of 180â
A and an operating cost of 0.0208â
US$/day was proposed. Based on these results, electrocoagulation can be considered an efficient technology to treat arsenic-contaminated water and meet the drinking water quality standards.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Arsênio
/
Poluentes Químicos da Água
/
Água Subterrânea
/
Purificação da Água
Tipo de estudo:
Guideline
Idioma:
En
Revista:
Environ Technol
Assunto da revista:
SAUDE AMBIENTAL
/
TOXICOLOGIA
Ano de publicação:
2021
Tipo de documento:
Article