-0 PRACTCAL EXERCISE A Wastewater Treatment Works has an aerobic reactor that measures 50m25m3.5m deep. Sludge is wasted from the clarifier underflow. Sludge is dried on drying beds measuring 25m20m each. After 30 minutes of settling the level in the 11 cylinder is read off as 550ml. From previous calculations we can take the 5V as 100ml/g. The last laboratory report indicated that the Return Activate Sludge was 1.2 times thicker than the MLSS 1=00 a) What is the MLSS concentration in mg/l ? Answer: b) How full should one drying bed be made in order to maintain a 22 day Sludge Age? Answer: v \[ \text { } \frac{\multicolumn{2}{\omega}{}}{\omega} \]