activated sludge plant的用法和样例：
- Sludge biotic index (SBI), based on the microfauna associated with activated sludge mixed liquor, has been devised to monitor activated sludge plant performance.
- Physico-chemical parameters of Baoding Lugang Sewage Treatment Plant activated sludge system were predicted based on microfauna.
- Over 300 strains of bacteria have been found in activated sludge.
- Acetate was degraded by denitrifying activated sludge.