Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 169, Issue 1-3, Pages 428-434Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2009.03.152
Keywords
Lignin remediation; Chemical precipitation; Ozonation; Biodegradability
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Funding
- Department of Graduate Study and Investigation of the National Polytechnic Institute of Mexico [20070444]
- National Counsel of Science and Technology of Mexico-CONACyT [49367]
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In the present work the degradation of the lignin and its derivatives in the residual water of a paper industry by simple ozonation was investigated. The remediation of lignin was realized using the combination of the pre-treatment with chemical precipitation, using concentrated sulfuric acid (97.1%) at the pH 1 and 3, and of the simple ozonation of the filtered residual water at the pH 1. 3, 8 and 12. Since the high residues content (the initial chemical oxygen demand (COD) is 70,000 mg/L) in the experiments the diluted samples (1:10) were used. The previous precipitation has showed a significant effect on the reduction of the COD (77%) and color (96.1%). The sludge precipitated contents sulfolignin, which in the reaction with sulfuric acid was formed. In ozonation of the filtered residual water during 25 min at the pH 1, 3. 8 and 12 the follows by-products were formed: fumaric, maleic, malonic and formic acids. The biodegradability of the treated water in ozonation increases up 0.067-0.29. The effect of the precipitation and the ozonation conditions on the decolorization kinetics was evaluated. (C) 2009 Elsevier B.V. All rights reserved.
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