In wastewater treatment, microorganisms are often used to convert dissolved organic compounds to more microorganisms, which are then removed from the flow stream by such processes as thickening. One such operation is known as the activated sludge system shown in Figure. Because the activated sludge system converts dissolved organics to suspended solids, it increases the solids concentration. These solids are the microorganisms. Unfortunately, the process is so efficient that some of these microorganisms (solids) must be wasted. The slurry of these solids removed from the activated sludge system is called waste activated sludge. Suppose an activated sludge system has an influent (feed) of 20700,710 m3/d at a suspended solids concentration of 45,1 mg/L. The waste activated sludge flow rate is 600,700 m3/d at a solids concentration of 1.4 %. The effluent (discharge) has a solids concentration of 19,800 mg/L. What is the yield of waste activated sludge in kg per day, or in other words, what is the rate of solids production in the system? Assume steady state.