Efficacy of Chemical Oxidation and Coagulation for COD and Color Reduction from Pulp Mill Effluent
Publication: Journal of Environmental Engineering
Volume 138, Issue 12
Abstract
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 [, chemical oxygen demand ] 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% at temperatures ranging from 130 to 170°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.
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Acknowledgments
The financial support from the Dept. of Science and Technology (DST), New Delhi, through Fast Track Scheme for Young Scientists to Dr. Anurag Garg is acknowledged to carry out the experiment study. The authors are also thankful to the DST—National Research Foundation (NRF) for supporting the collaboration between the Indian Institute of Technology (IIT), Bombay, and the Univ. of Pretoria, South Africa, under Indian/South African Science and Technology Cooperation Programme.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 138 • Issue 12 • December 2012
Pages: 1194 - 1199
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Feb 5, 2012
Accepted: Jun 26, 2012
Published online: Aug 2, 2012
Published in print: Dec 1, 2012
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