A settling tank in a water treatment plant has an inflow of 2m3/min and a solids concentration of 2100 mg/L. The effluentfrom this settling tank goes to sand filters. Theconcentration of sludge coming out of the bottom (the underflow) is18,000 mg/L, and the flow to the filters is 1.8 m3/min.
a. What is the underflow flow rate?
b. What is the solids concentration in the effluent?
c. How large must the sand filters be (in m2)?