Behavior of aromatic compounds contained in kraft mill effluents treated by an aerated lagoon.
Kraft mill effluents were biologically treated in an aerated lagoon (AL) (3.4 L) to evaluate the behavior of aromatic compounds by UV-vis spectroscopy. Under aerobic conditions, biological oxygen demand (BOD(5)) removal was between 84% and 95%, whereas soluble chemical oxygen demand (COD(s)) removal ranged between 40% and 60%. A slight increase was observed in the VIS(436)/COD(s) relationship (0.101-0.110), indicating that color reduction was less than the total organic matter reduction expressed by COD(s). Additionally, low values of UV(254)/UV(280) (1.23-1.12) indicate the presence of lignin-derived compounds in the aerobic effluent relationship. Ultrafiltration (UF) analysis shows that color was concentrated in the molecular weight fraction larger than 10,000 Da. The recalcitrant fraction was found to be resistant to further biodegradation, even under optimized microbiological conditions.
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Environmental Science Center EULA-Chile, University of Concepción, P.O. Box 160-C, Chile.
Xavier
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Vidal
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D001420:Bacteria, Aerobic / Q000378:metabolism*; D001673:Biodegradation, Environmental; D018929:Cell Culture Techniques / Q000379:methods*; D006841:Hydrocarbons, Aromatic / Q000378:metabolism*; D007220:Industrial Waste / Q000517:prevention & control; D010209:Paper; D014871:Water Microbiology; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
D006841:Hydrocarbons, Aromatic; D007220:Industrial Waste; D014874:Water Pollutants, Chemical