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Improvement of COD and TOC
reactive dyes in textile wastewater by coagulation chemical
material
H. Najafi* and H. R. Movahed
Department
of Textile, Islamic Azad University, Shahre Rey Branch,
Tehran, Iran.
*Corresponding author. E-mail:
textilechemist.najafi@yahoo.com.
Tel.:
982122003756. Fax: 982122003756.
Accepted 6
March, 2009 |
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This study was designed to investigate the removal of
reactive dyes, Samofix Red V-RBL and Samofix Green V-G from
wastewater using a two step Al (III) coagulation/activated
carbon adsorption method. The effects of pH and coagulant
dosage as well as the effects of contact time and a powdered
activated carbon dosage on dye removal were studied. The
process was optimized with reasonable consumption of
coagulant and quantity of obtained sludge. Coagulation as a
main treatment process followed by adsorption achieved
almost total elimination of both dyes from wastewater with
significant reduction (90%) of chemical oxygen demand (COD),
total organic carbon (TOC) and absorbable organic halide (AOX).
Besides high efficiency of dye removal, the combined
treatment process offers many advantages for potential
application such as coagulant savings, minimal amount of
sludge formation and also an economic feasibility since it
does not require high costs for chemicals and equipments.
Key
words:
Reactive dye, textile wastewater, coagulation material, COD,
TOC. |
