Biological dehalogenation of kraft mill wastewaters

A single-stage aerobic biological treatment system was developed specifically to convert organically bound chlorine to inorganic chloride. In initial laboratory tests, greater than 90% reduction of AOX was achieved in synthetic dichlorophenol, commercial pentachlorophenol, and combined kraft wastewa...

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Bibliographic Details
Published in:Water science and technology 1991-01, Vol.24 (3/4), p.287-293
Main Authors: Bryant, C.W, Barkley, W.A
Format: Article
Language:English
Subjects:
2,4-dichlorophenol
Acclimation
Acclimatization
aerobic dehalogenation
Aerobic treatment
Biological treatment
By products
chlorides
chlorinated phenols
Chlorination
Chlorine
Dehalogenation
Effluents
Experiments
Industrial wastewater
Influents
inorganic compounds
Laboratories
Laboratory tests
Lagoons
Molecular weight
organochlorine compounds
Pentachlorophenol
pulp and paper mill effluents
Pulp wastes
Reactors
Reduction
Research methodology
Wastewater
Wood preservatives
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Summary:A single-stage aerobic biological treatment system was developed specifically to convert organically bound chlorine to inorganic chloride. In initial laboratory tests, greater than 90% reduction of AOX was achieved in synthetic dichlorophenol, commercial pentachlorophenol, and combined kraft wastewaters, and less than a week was required for startup/acclimation. A six-month field test of the process on a pentachlorophenol wastewater was very successful under highly variable influent conditions. No chlorinated byproducts were detected, and measurements strongly indicated that dehalogenation had occurred. Recent experiments found Cl/El wastewater to be most easily treatable by the aerobic process, followed by combined lagoon influent, El wastewater, and finally lagoon effluent. However, results have indicated that application of the treatment process to kraft AOX reduction can become feasible only if further process improvements can be defined.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.1991.0485