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.
- The acclimated active sludge could degrade 78% of oil in 24h.