The settling tank in the water treatment plant has the inflow of 2,000 lpm (liters per minute). Solid concentration in inflow is reported by the laboratory manager as being 2.1 g/liter. Effluent from settling tanks is pumped to or it is let to go by gravity in sand filters (generally, latter is better than former). Concentration of sludge (underflow from settling tank) is 1.8 g/L. Flow in filters is 1.8 liters per minute.
i) Determine underflow rate in settling tank?
ii) Compute surface area of sand filters to be used with settling tank of given performance and characteristics as described above
c) Determine solid concentrations in effluent.