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Toxic compounds are produced in pulp and papermaking processes and can be a problem if not properly treated. Several tests have been developed to monitor the toxicity of these effluents. One test is the Microtox assay developed by A. A. Bulich of the Microbics Corporation. This assay was used to determine the toxicity of compounds found in the effluent of a typical integrated bleach kraft pulp and paper mill. This assay was used to find a synergistic effect between the most toxic compounds determined by the Microtox assay. The toxic concentrations from the Microtox assay were compared to the toxic concentration for rainbow trout, flathead minnow, daphnia magna, and selenastrum for the same compounds. No significant correlation could be established. The Microtox is a good order of magnitude screening tool, but must be used in conjunction with other tests to assess aquatic toxicity.
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Assessment of the Microtox Toxicity Analyser as a Screening Test for an Integrated Bleached Kraft Pu