This study concentrated on the biological treatment and post-ozonation of mature eucalypt kraft bleachery effluents. The objectives were to optimise reduction of priority pollutants such as AOX, chlorate, high molecular weight chromophores and toxicity while maintaining high COD/BOD removals. Biological treatment was adequately modelled with Monod kinetics, using biodegradable COD. Sludge yields were of the order 0.76 g biomass/g BCOD. Treatment was most effective (70% total COD reduction and 95% BOD5 reduction) with sludge ages over 20 days and F/M ratios 0.2-0.3. Biological treatment did not reduce total AOX nor colour but reduced chlorate by 63% in preliminary trials. A fungal isolate, Aspergillus.p2 reduced colour by 54% when supplemented with glucose. Ozonation as a tertiary treatment reduced AOX by 60% and colour decrease followed first-order kinetics with respect to ozone consumption.
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Research Article|
March 01 1994
Treatment of Bleachery Effluents from Kraft Mills Pulping Mature Eucalypts
B. H. Boyden;
B. H. Boyden
*University of New South Wales, P.O. Box 1, Dept. of Civil Engineering, Centre for Wastewater Treatment, Kensington, NSW, Australia 2033, Australia
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X. Z. Li;
X. Z. Li
**Currently at Hong Kong Polytechnic, Department of Civil and Structural Engineering, Hung Hom, Kowloon, Hong Kong
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T. J. Schulz;
T. J. Schulz
*University of New South Wales, P.O. Box 1, Dept. of Civil Engineering, Centre for Wastewater Treatment, Kensington, NSW, Australia 2033, Australia
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O. Hijazin;
O. Hijazin
*University of New South Wales, P.O. Box 1, Dept. of Civil Engineering, Centre for Wastewater Treatment, Kensington, NSW, Australia 2033, Australia
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P. Peiris;
P. Peiris
***University of Western Sydney-Hawkesbury, Water Research Laboratory, Richmond, NSW, Australia 2753, Australia
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J. Bavor
J. Bavor
***University of Western Sydney-Hawkesbury, Water Research Laboratory, Richmond, NSW, Australia 2753, Australia
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Water Sci Technol (1994) 29 (5-6): 247–258.
Citation
B. H. Boyden, X. Z. Li, T. J. Schulz, O. Hijazin, P. Peiris, J. Bavor; Treatment of Bleachery Effluents from Kraft Mills Pulping Mature Eucalypts. Water Sci Technol 1 March 1994; 29 (5-6): 247–258. doi: https://doi.org/10.2166/wst.1994.0719
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