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Assessing the application of advanced oxidation processes, and their combination with biological treatment, to effluents from pulp and paper industry.
- Source :
-
Journal of hazardous materials [J Hazard Mater] 2013 Nov 15; Vol. 262, pp. 420-7. Date of Electronic Publication: 2013 Sep 13. - Publication Year :
- 2013
-
Abstract
- The closure of water circuits within pulp and paper mills has resulted in a higher contamination load of the final mill effluent, which must consequently be further treated in many cases to meet the standards imposed by the legislation in force. Different treatment strategies based on advanced oxidation processes (ozonation and TiO2-photocatalysis), and their combination with biological treatment (MBR), are herein assessed for effluents of a recycled paper mill and a kraft pulp mill. Ozone treatment achieved the highest efficiency of all. The consumption of 2.4 g O3 L(-1) resulted in about a 60% COD reduction treating the effluent from the kraft pulp mill at an initial pH=7; although it only reached about a 35% COD removal for the effluent of the recycled paper mill. Otherwise, photocatalysis achieved about a 20-30% reduction of the COD for both type of effluents. In addition, the effluent from the recycled paper mill showed a higher biodegradability, so combinations of these AOPs with biological treatment were tested. As a result, photocatalysis did not report any significant COD reduction improvement whether being performed as pre- or post-treatment of the biological process; whereas the use of ozonation as post-biological treatment enhanced COD removal a further 10%, summing up a total 90% reduction of the COD for the combined treatment, as well as it also supposed an increase of the presence of volatile fatty acids, which might ultimately enable the resultant wastewater to be recirculated back to further biological treatment.<br /> (Copyright © 2013 Elsevier B.V. All rights reserved.)
- Subjects :
- Biological Oxygen Demand Analysis
Catalysis
Oxidants chemistry
Oxidation-Reduction
Ozone chemistry
Sewage microbiology
Sunlight
Titanium chemistry
Titanium radiation effects
Ultraviolet Rays
Water Pollutants chemistry
Water Pollutants metabolism
Bioreactors
Industrial Waste
Paper
Waste Disposal, Fluid methods
Subjects
Details
- Language :
- English
- ISSN :
- 1873-3336
- Volume :
- 262
- Database :
- MEDLINE
- Journal :
- Journal of hazardous materials
- Publication Type :
- Academic Journal
- Accession number :
- 24076569
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2013.09.005