Research Article
Landfill Leachate Toxicity Removal in Combined Treatment with Municipal Wastewater
Table 9
Toxicity of raw and treated wastewater (10% of leachate in influent I and II; the 95% confidence limit in parenthesis).
| Organism | Number of tests | System | Influent | Effluent | Average EC50 [%] | | Average EC50 [%] | |
| Daphnia magna | 5 | I | 32 (15.2–48.8) | | h.e. 28% | | 5 | II | 23.6 (21.7–25.5)* | | 0 (h.e. < 10%) | 0 | 5 | III | 43.7 (38.1–49.3) | | 0 | 0 | Thamnocephalus platyurus | 5 | I | 10.6 (7.8–13.4)* | | 84 (76.9–91.1)* | | 5 | II | 10.7 (9.4–12.0)* | | 0 (h.e. < 10%) | 0 | 5 | III | 19.8 (17.3–22.3) | | 0 | 0 | Raphidocelis subcapitata | 5 | I | 57.0 (47.5–66.5) | | Growth stimulation | 0 | 5 | II | 32.3 (31.6–33.0)* | | 0 | 5 | III | 55.0 (52.1–57.9) | | 0 | Vibrio fischeri | 3 | I | 17.1 (11.3–22.9)* | | 55.9 (30.7–80.3)* | | 3 | II | 15.3 (12.2–18.4)* | | 87.3 (82.1–92.5)* | | 3 | III | 30.3 (27.2–33.4) | | 0 | 0 |
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h.e.: highest observed effect for nondiluted sample.
*Indicates significant differences versus control-III (Students -test, ).
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