Integrated ozonation-biotreatment of pulp bleaching effluents containing chlorinated phenolic compounds

Journal Article · · Biotechnology Progress; (United States)

DOI:https://doi.org/10.1021/bp00013a010· OSTI ID:5010083

Heinzle, E; Geiger, F; Fahmy, M; Kut, O M ^[1]

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1. Bioprocess Engineering Group, Zuerich (Switzerland)

Bleaching effluents from pulp and paper industry are problematic because they contain toxic chlorinated phenolic compounds and recalcitrant chlorinated lignin fragments of higher molecular weight. The chlorinated phenolic compounds have been shown to be rather easily removable in fluidized bed bioreactors. The total amount of adsorbable organic halogens (AOX), however, was only reduced by 20%-30%. It is generally possible to oxidize all unsaturated organic compounds in the bleaching effluents by ozonation. However, ozone is still too expensive to allow complete treatment. Nevertheless, the increase of biodegradability of recalcitrant components by dechlorination and degradation of high molecular weight fractions by ozone can lead to increased efficiency in a subsequent biotreatment. In this study the simple ozonation of bleaching effluents with and without biological pretreatment was compared with sequential or cyclic ozonation-biotreatment schemes. By integrated ozonation was markedly increased. The overall efficiency of the treatment process in terms of fractional removals of global parameters COD, TOC, and AOX increased. More than 70% of AOX were eliminated. No toxic effect was observed in the cyclic reactor, where the liquid passed was cycling between an ozonation and a biotreatment zone. In the liquid phase no dissolved ozone could be detected in this reactor.

• OSTI ID: 5010083
• Journal Information: Biotechnology Progress; (United States), Journal Name: Biotechnology Progress; (United States) Vol. 8:1; ISSN 8756-7938; ISSN BIPRE
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
54 ENVIRONMENTAL SCIENCES
540320 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AROMATICS
BIODEGRADATION
BIOREACTORS
CHEMICAL EFFLUENTS
CHEMICAL OXYGEN DEMAND
CHEMICAL REACTIONS
CHEMICAL WASTES
CHLORINATED AROMATIC HYDROCARBONS
DECOMPOSITION
EFFICIENCY
HALOGENATED AROMATIC HYDROCARBONS
HYDROGEN COMPOUNDS
INDUSTRY
LIQUID WASTES
MANAGEMENT
MOLECULAR WEIGHT
NONRADIOACTIVE WASTES
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
OZONIZATION
PAPER INDUSTRY
PROCESSING
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
WOOD PRODUCTS INDUSTRY