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Assessment of design and operating parameters for high rate anaerobic dechlorination of segregated kraft mill bleach plant effluents

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The removal of organochlorine from segregated kraft mill bleach plant wastewaters using high rate anaerobic reactors was investigated at bench scale. Modified sludge blanket reactors with long solids retention times were utilized in the study and the adsorbable organic halogen (AOX) technique was used as a measure of wastewater organochlorine content. The factors investigated for influence on dechlorination included the presence or absence of synthetic evaporator condensate as a cosubstrate, hydraulic retention time, and wastewater dilution. Removal efficiencies of AOX ranging from 27 to 65% were observed over hydraulic retention times ranging from 3 to 48 hours. Although bleach plant wastewaters have been reported to be extremely inhibitory to methanogens, methane production was observed under all conditions imposed on the biomass in this study. Approximately 3% of the influent AOX remained in the treated effluent as nonfilterable AOX. Accumulation of AOX in the reactor contents was found to account for 5% of the cumulatives influent AOX.
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Keywords: anaerobic process; biological treatment; bleach plant; condensates; continuous process; methanogens; organochlorine

Document Type: Research Article

Publication date: 1993-05-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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