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Implications of Aerated Stabilization Basin Dredging on Potential Effluent Toxicity to Fish
- Source :
- Water Environment Research. 82:440-446
- Publication Year :
- 2010
- Publisher :
- Wiley, 2010.
-
Abstract
- Benthal solids accumulated in aerated stabilization basins (ASBs) must be dredged to regain treatment capacity. While dredging restores treatment performance, it has been associated occasionally with the failure to meet regulatory effluent toxicity limits at the time of dredging. A first study of its kind was undertaken to investigate the implications of ASB dredging on potential effluent toxicity to fish. The study showed that benthal solid slurry removed from the quiescent zone of an ASB with a hydraulic dredge was toxic to rainbow trout with a 96-hour median lethal concentration (LC50) of 2.2%. The high ammonia concentration in the sample was the main cause of fish mortality. Hydrogen sulfide and resin and fatty acids also were present in the dredged material at concentrations that could cause fish mortality. These findings have led to best management practices that can be used to mitigate or eliminate fish toxicity issues during dredging operations.
- Subjects :
- Paper
Fish mortality
Industrial Waste
Waste Disposal, Fluid
Dredging
Ammonia
Water Pollution, Chemical
Animals
Environmental Chemistry
Hydrogen Sulfide
Water pollution
Waste Management and Disposal
Effluent
Water Science and Technology
Bacteria
Waste management
Ecological Modeling
Fatty Acids
Hydrogen-Ion Concentration
Pollution
Oxygen
Wastewater
Oncorhynchus mykiss
Toxicity
Environmental science
Sewage treatment
Resins, Plant
Water Pollutants, Chemical
Waste disposal
Subjects
Details
- ISSN :
- 10614303
- Volume :
- 82
- Database :
- OpenAIRE
- Journal :
- Water Environment Research
- Accession number :
- edsair.doi.dedup.....266fd3402f4755d8613f902ed8acfc6a