Table 2.
Percentage concentration corresponding to NOEC and LOEC for Hydra and IC50 for the lettuce seeds tests conducted with the effluent and sludge that had been incubated with cyanobacteria for 14 days at 25 °C.
| Treatments |
Hydra test |
Seeds test | ||||
|---|---|---|---|---|---|---|
| NOECa |
LOECb |
IC50c |
||||
| Effluent | Sludge | Effluent | Sludge | Effluent | Sludge | |
| Dark control | 6.25 | 6.25 | 12.5 | 3.12 | 94.98 | 17.28 |
| Light control | 12.5 | 6.25 | 25 | 3.12 | 0 | 51.52 |
| Anabaena sp. | 25 | 6.25 | 50 | 3.12 | 0 | 55.37 |
| Phormidium sp. | 50 | 12.5 | n.e.d | 6.25 | 0 | 6.23 |
| Synechococcus sp. | 25 | 12.5 | 50 | 6.25 | 0 | 23.89 |
a
NOEC, no observed effect concentration.
b
LOEC, low observed effect concentration.
c
IC50, concentration that caused 50% inhibition of the test organisms.
d
n.e., no effect.