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Attenuation of methylene blue dye during riverbank filtration through sandy aquifers
Author(s) -
Mishra Shrinishtha,
Kumar Pradeep
Publication year - 2015
Publication title -
water and environment journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 37
eISSN - 1747-6593
pISSN - 1747-6585
DOI - 10.1111/wej.12123
Subject(s) - aquifer , methylene blue , adsorption , saturation (graph theory) , partition coefficient , langmuir adsorption model , filtration (mathematics) , chemistry , groundwater , environmental chemistry , environmental engineering , chromatography , environmental science , geology , geotechnical engineering , organic chemistry , photocatalysis , statistics , mathematics , combinatorics , catalysis
Although several studies have focused on the removal of organics and pathogens during riverbank filtration (RBF), no study has been carried out on the attenuation of dyes during RBF. In the present work, removal of methylene blue (MB) through aquifer materials collected from five RBF sites in India has been investigated. Brunauer Emmet Teller (BET) surface areas of the aquifer materials were 1.2–6.5 m 2 /g. Adsorption followed the pseudo‐second‐order kinetics and Langmuir isotherm, suggesting monolayer adsorption. Column results showed saturation capacity of 0.467–1.234 mg MB/g for different aquifer materials. Retardation factors for MB were found to be very high ranging from 430 to 987, due to its high hydrophobicity (octanol/water partition coefficient = 5.85). Results showed that BET surface area or the roughness played a very important role in the retardation of MB. Results suggest that the breakthrough of MB in a RBF well in sandy aquifers will take several years.