activity sludge quantity的用法和样例：
- When activated sludge was taken as inoculum,the daily gas production was increased with the increasing of material quantity.
- Respirometer was used to monitor microbial activity in activated sludge.
- Over 300 strains of bacteria have been found in activated sludge.
- Dyeing and printing wastewater was treated biologically and then by "fluidized activated carbon" in place of flocculation to lower the treatment cost, decrease the sludge quantity and raise the treatment to a very high level.