A groundwater contains the following components: Ca²⁺ = 240 mg/L as CaCO₃, Mg²⁺ = 135 mg/L as CaCO₃, H₂CO₃ = 30 mg/L as CaCO₃ and alkalinity = 315 mg/L as CaCO₃. The treated water should have a Mg²⁺ concentration of 40 mg/L as CaCO₃ and a total hardness of 100 mg/L as CaCO₃. The drinking water flow rate is 1 m³/s.

a)Estimate the daily lime requirement (kg/d)

b)Estimate the daily soda ash requirement (kg/d)

c)Estimate total daily CO₂ requirement for water stabilization (kg/d)

d)Estimate the daily sludge production (kg/d)