A sewage treatment plant employing activated sludge process is operated under the following conditions:
Wastewater flow rate into the aeration $\operatorname{tank}=0.150 \mathrm{~m}^{3} / \mathrm{s}$
Soluble $\mathrm{BOD}_{5}$ in the influent $=84 \mathrm{mg} / \mathrm{L}$
Soluble $\mathrm{BOD}_{5}$ in the effluent $=11 \mathrm{mg} / \mathrm{L}$
Mean cell residence time $=5$ days
Total yield co-efficient $=0.5 \mathrm{~kg}$ of $\mathrm{MLVSS} / \mathrm{kg} \mathrm{BOD}_{5}$ removed
Decay rate of microorganism $=0.050 /$ day
The net waste activated sludge produced in the plant is $\_\_\_\_$ $\text{kg}$ of $\mathrm{VSS/day}$ (rounded off to two decimal places).
