Acute and Sub-lethal Toxicity of Landfill Leachate Towards Two Aquatic Macro-invertebrates: Demonstrating the Remediation Potential of Aerobic Digestion |
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Authors: | M. C. Bloor C. J. Banks |
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Affiliation: | (1) School of Civil Engineering and the Environment, University of Southampton, Highfield, SO17 1BJ Southampton, UK |
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Abstract: | A specific landfill leachate that contained 1.036 mgl−1of 2-chlorobiphenyl was used in the study (255 mg l−1 COD and 133 mg l−1 BOD5). Three, 2-l semi-continuous batch reactors (SBRs) were used to simulate the treatment potential of this method on a small scale. Aerobic digestion effectively reduced the leachates COD concentration. Regardless of dilution, the leachates COD reached a <20 mg l−1 equilibrium after 96 h exposure to aerobic digestion, however, increasing the level of dilution accelerated the process. In untreated leachate, the LC50 for Asellus aquaticus was 57% v/v leachate in deionised water and 5% for Gammarus pulex (96 h, static LC50 tests without nutrition and oxygen depleting conditions). After being exposed to aerobic digestion, these values rose to 95% and 40%, respectively. Prolonged exposure to a 1:20 sub-lethal dilution of the aforementioned leachate has been previously shown to affect the breeding colony size of Asellus aquaticus and a 1:66 dilution influenced the fecundity of a Gammarus pulex population. After remediation by aerobic digestion, however, the population dynamics of both test species remained unaltered. |
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Keywords: | aerobic digestion Asellus aquaticus 2-chlorobiphenyl Gammarus pulex landfill leachate toxicity tests |
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