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Efficacy of Chemical Oxidation and Coagulation for COD and Color Reduction from Pulp Mill Effluent

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Title Efficacy of Chemical Oxidation and Coagulation for COD and Color Reduction from Pulp Mill Effluent
 
Creator DHAKHWA, S
BANDYOPADHYAY, S
MAJOZI, T
GARG, A
 
Subject Biodegradability
Catalytic wet oxidation
Coagulation
Combined treatment
Pulp mill effluent
CATALYTIC WET OXIDATION
DILUTED BLACK LIQUOR
PAPER
PRECIPITATION
REMOVAL
PRETREATMENT
WATER
 
Description In a pulp and paper mill, the highly colored wastewater generated from the pulping process requires pretreatment before the biological purification process because of the presence of recalcitrant lingo-cellulosic compounds. For the present study, the black liquor was prepared in the laboratory by digesting the sugarcane baggase using the soda process, which was further diluted before use in the experimental study. The wastewater [pH = 13.0, chemical oxygen demand (COD) = 5, 120 mg/L] was treated by two processes: wet oxidation (WO) (both noncatalytic and catalytic) and coagulation. Catalytic WO (CWO) experiments were conducted in the presence of 60% CuO/40% CeO2 at temperatures ranging from 130 to 170 degrees C and total pressures of 0.95 MPa. During the CWO process, the maximum COD and color removals were found to be approximately 51 and 71%, respectively. Coagulation followed by noncatalytic WO exhibited the best performance with overall COD and color reductions of approximately 77.5 and 87%, respectively. The biodegradability of the wastewater was increased to 0.60 and 0.96 after CWO and combined treatment, respectively, from an initial value of 0.22. DOI: 10.1061/(ASCE)EE.1943-7870.0000611. (C) 2012 American Society of Civil Engineers.
 
Publisher ASCE-AMER SOC CIVIL ENGINEERS
 
Date 2014-10-16T14:30:41Z
2014-10-16T14:30:41Z
2012
 
Type Article
 
Identifier JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE, 138(12)1194-1199
http://dx.doi.org/10.1061/(ASCE)EE.1943-7870.0000611
http://dspace.library.iitb.ac.in/jspui/handle/100/15789
 
Language en