Landfill Leachate Toxicity Removal in Combined Treatment with Municipal Wastewater

Table 8

Toxicity of raw and treated wastewater (1% of leachate in influent I and II; the 95% confidence limit in parenthesis).

Organism	Number of tests	System	Influent		Effluent
			Average EC50 [%] ± SD	TU	Average EC50 [%] ± SD	TU
Daphnia magna	5	I	33.0 (23.3–42.7)	3.2±0.8	h.e. < 10%	0
	5	II	25.5 (22.6–28.7)*	4.0±0.5	h.e. < 10%	0
	5	III	36.3 (28.4–44.2)	2.8±0.6	h.e. < 10%	0
Thamnocephalus platyurus	5	I	18.0 (10.1–25.9)	7.2±4.4	h.e. < 10%	0
	5	II	16.3 (10.1–22.5)	7.9±4.0	h.e. < 10%	0
	5	III	18.8 (16.4–21.2)	7.5±4.2	0	0
Raphidocelis subcapitata	5	I	67.0 (53.9–80.1)*	1.5±0.3	Growth stimulation	0
	5	II	44.0 (28.7–59.2)	2.6±1.0		0
	5	III	54.0 (42.4–65.6)	1.9±0.6		0
Vibrio fischeri	5	I	23.5 (19.2–27.9)	4.3±0.6	h.e. 20%*	0.4±0.2
	5	II	24.3 (19.9–28.6)*	4.2±0.6	91.5 (80.1–102.9)*	0.8±0.5
	5	III	21.0 (14.8–27.2)	5.0±1.2	0	0

h.e.: highest observed effect for nondiluted sample.
*Indicate significant differences versus control III (Students 𝑡-test, 𝑃<0.05).