A water treatment facility must treat 12,000 kg/min water with a severe hardness problem. The density of the salt water is 1060 kg/m³. The incoming and required exit water specifications are given below:

- 166 g/1 carcinogenic volatile organic compounds are in the entering water. The effluent should have no more than 6g/1 VOCs

- The required exit limit of magnesium sulfate should not exceed 24 mg/liter

- Assume practical limits of removal of 30 mg/l of CaCO₃ and 10 mg/l of Mg(OH)₂ as CaCO_3. For each step a rapid mix tank with a residence time of 1.6 minutes should be used to mix the chemicals and combined reactor/sedimentation basin is needed for each.

For both lime and soda ash treatment specify the feed rates in g/min given 10 mg/l excess lime and 10 mg/1 excess soda ash.

	Inlet (mg/1)	Exit (mg/1)	Reaction Order	k
Calcium Bicarbonate	180	20	First	0.081 min-1
Magnesium Sulfate	72	12	Second	0.0026 1/mg.min
Calcium Sulfate	156	6	Zero	3.26 g/l.min