Aerobic degradation of 2,4,6-TCP content in ECF bleached effluent.
Elemental chlorine-free (ECF) bleach effluents from kraft mill are characterised by: a chemical organic demand/biological organic demand (COD/BOD(5)) ratio of 4, chlorophenol content with low chlorine substitution, and toxicity. The effect of increasing the concentration of 2,4,6-trichlorophenol (2,4,6-TCP) content in ECF bleaching sequence effluent on the degradative activity of bacterial communities present in an aerobic system treatment was studied. An aerobic lagoon (AL) was used as a typical secondary treatment of kraft-mill effluent. AL displays a high performance of BOD(5) degradation (up to 90%); however, only 40% of the COD was removed. Simultaneously, the AL system shows a high ability to biodegrade 2,4,6-TCP up to 237 mg/l day. Kinetic parameters of the 2,4,6-TCP biodegradation by aerobic bacteria were determined. The K(s) and K(i) values were 34.3 and 50 mg/l 2,4,6-TCP, respectively. Moreover, the tolerance of aerobic bacteria was observed up to 1.3 g/l 2,4,6-TCP.
Correa
J
J
Department of Microbiology, Biological Sciences Faculty, University of Concepción, PO Box 160-C, Concepcion, Chile.
Domínguez
V M
VM
Martínez
M
M
Vidal
G
G
D001420:Bacteria, Aerobic; D001673:Biodegradation, Environmental; D002733:Chlorophenols / Q000378:metabolism*; D007220:Industrial Waste; D007700:Kinetics; D009153:Mutagens / Q000378:metabolism*; D010209:Paper; D018508:Water Purification
D002733:Chlorophenols; D007220:Industrial Waste; D009153:Mutagens; C024564:2,4,6-trichlorophenol