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Improved effluent quality at a bleached kraft mill as determined by laboratory biotests
T G Kovacs1, J S Gibbons, P H Martel
1Paprican, Pointe Claire, Quebec, Canada.
Journal of Toxicology and Environmental Health
|December 6, 1996
Summary
Bleached kraft mill effluent quality improved significantly after process changes, showing no adverse effects on fathead minnows or Ceriodaphnia reproduction in aquatic toxicity tests.
Area of Science:
- Environmental Science
- Ecotoxicology
- Aquatic Toxicology
Background:
- Bleached kraft mills generate effluent that can impact aquatic ecosystems.
- Process modifications and effluent treatment changes were implemented at a mill.
- Assessing effluent quality is crucial for environmental protection.
Purpose of the Study:
- To evaluate the ecotoxicological impact of treated bleached kraft mill effluent.
- To compare current effluent quality with historical data.
- To determine the safety of mill effluent for aquatic life.
Main Methods:
- Life-cycle experiment using fathead minnows (Pimephales promelas) from egg to reproduction.
- Survival and reproduction tests with Ceriodaphnia dubia.
- Exposure to various effluent concentrations and control conditions.
Main Results:
- No significant adverse effects observed on fathead minnow hatching, survival, growth, reproduction, or development.
- Ceriodaphnia reproduction IC25 was approximately 80%, well above the environmental concentration.
- Effluent quality showed substantial improvement compared to pre-modification levels.
Conclusions:
- The modified mill effluent is compatible with the aquatic environment.
- Process and treatment modifications can lead to significant improvements in effluent quality.
- Further investigation is needed to identify specific contributing factors to the improvement.