Reduction of Mutagenicity of Pulp and Paper Mill Effluent by Secondary Treatment in an Aerated Lagoon

Abstract

ABSTRACT

Freshly collected waste water from a pulp and paper mill was tested in a Salmonella fluctuation assay before and after secondary treatment (biotreatment) in an aerated lagoon. Dose-related mutagenicity was found for the untreated and unconcentrated sample in the fluctuation assay but not in the standard plate incorporation test, and mutagenic activity was not detected after biotreatment. The fluctuation assays were performed without S9 for metabolic activation.