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Removal of Chemical Oxygen Demand and Color from Simulated Textile Wastewater Using a Combination of Chemical/Physicochemical Processes

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Title Removal of Chemical Oxygen Demand and Color from Simulated Textile Wastewater Using a Combination of Chemical/Physicochemical Processes
 
Creator YADAV, A
MUKHERJI, S
GARG, A
 
Subject ACTIVATED CARBON
COAGULATION PROCESSES
MAGNESIUM-CHLORIDE
FENTON PROCESS
DYE
ADSORPTION
FLOCCULATION
OXIDATION
CHITOSAN
AZO
 
Description The treatment of simulated textile wastewater [chemical oxygen demand (COD) = 3360 mg/L] was performed using three chemical/physicochemical processes, viz., coagulation, Fenton oxidation, and adsorption. Coagulation of the wastewater was performed in a jar test apparatus using inorganic and organic coagulants. The best color removal (similar to 96%) was obtained with FeSO4 while FeCl3 and MgCl2 caused similar to 75% and similar to 53% color removal, respectively. The optimum dose for iron-based coagulants was 3 g/L, whereas it was 6 g/L for MgCl2. FeSO4-treated wastewater showed the best results with regard to the settling of flocs. Chitosan was effective for the decolorization of wastewater at low dose (=10 mg/L) and acidic pH (similar to 3.0) showing similar to 20% and 30% COD and color reductions, respectively. For coagulation with FeSO4 followed by adsorption, overall COD and color removal of 85% and 99%, respectively, could be achieved. The raw wastewater treated by Fenton's process (H2O2 dose = 10.5 g/L and H2O2/Fe2+ molar ratio = 20) exhibited COD and color removal of similar to 80% and 99%, respectively. Using Fenton oxidation as a post-treatment step after coagulation with FeSO4, the COD removal was enhanced to similar to 83%, although the color removal remained unaffected. The sequential treatment also increased the BOD5 (biochemical oxygen demand) to COD ratio of the treated wastewater to 0.51.
 
Publisher AMER CHEMICAL SOC
 
Date 2014-10-14T12:41:57Z
2014-10-14T12:41:57Z
2013
 
Type Article
 
Identifier INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 52(30)10063-10071
http://dx.doi.org/10.1021/ie400855b
http://dspace.library.iitb.ac.in/jspui/handle/100/14432
 
Language en