Ecotoxicological evaluation of cork-boiling wastewaters
E Mendonça1, A Picado, L Silva
1Instituto Nacional de Engenharia, Tecnologia e Inovação, Estrada do Paço do Lumiar, 1649-038 Lisbon, Portugal. elsa.mendonca@ineti.pt
Ecotoxicology and Environmental Safety
|April 20, 2006
Summary
Cork-boiling wastewater is toxic to aquatic life, with 78% of samples harming the most sensitive species. The Microtox test is recommended for routine monitoring to ensure environmental protection.
Area of Science:
- Environmental Science
- Ecotoxicology
- Water Quality Assessment
Background:
- Cork-boiling wastewater poses potential environmental risks.
- Assessing the ecotoxicity of industrial effluents is crucial for environmental protection.
Purpose of the Study:
- To evaluate the acute and chronic toxicity of cork-boiling wastewater using multiple bioassays.
- To correlate wastewater toxicity with key physicochemical parameters.
- To recommend an effective biomonitoring tool for cork-boiling wastewater.
Main Methods:
- Acute toxicity tests were conducted using Vibrio fischeri (Microtox assay) and Daphnia magna.
- Chronic toxicity tests were performed on Daphnia magna and Lemna minor.
- Correlation analysis was performed between toxicity data and physicochemical parameters (COD, BOD5, TOC, tannin, lignin, TS).
Main Results:
- 78% of samples were classified as acutely toxic to Vibrio fischeri.
- Acute toxicity values (EC50) ranged from 2.3% to 24.2% (Microtox) and 4.4% to 29.5% (Daphnia).
- Significant correlations were found between EC50 values and COD, BOD5, TOC, tannin, lignin, and TS.
- Chronic toxicity tests showed significant effects, with EC50 values of 0.32% for D. magna and 26.0% for L. minor.
- No significant correlation was observed between the Microtox and Daphnia acute toxicity tests.
Conclusions:
- Cork-boiling wastewater exhibits significant acute and chronic toxicity to aquatic organisms.
- The Microtox test is a sensitive and reliable method for routine biomonitoring of cork-boiling wastewater.
- Integrating Microtox testing can enhance environmental protection strategies for industrial effluents.
