1. Aerobic degradation of 2,4,6-tcp content in ecf bleached effluent
- Author
-
V. M. Domínguez, Miguel Martínez, Gladys Vidal, and J. Correa
- Subjects
Biochemical oxygen demand ,Chlorophenol ,Paper ,lcsh:GE1-350 ,Chromatography ,Chemistry ,Aerobic bacteria ,Chemical oxygen demand ,Aerobic treatment system ,Industrial Waste ,Biodegradation ,Water Purification ,Bacteria, Aerobic ,chemistry.chemical_compound ,Kinetics ,Biodegradation, Environmental ,Environmental chemistry ,Aerated lagoon ,Effluent ,lcsh:Environmental sciences ,General Environmental Science ,Chlorophenols ,Mutagens - Abstract
Elemental chlorine-free (ECF) bleach effluents from kraft mill are characterised by: a chemical organic demand/biological organic demand (COD/BOD5) 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 BOD5 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 Ks and Ki 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. Keywords: 2,4,6-TCP, Aerobic biodegradation, Isolation strain, ECF effluent
- Published
- 2003