Question: answer a, b , c and d , and show steps please thanks 2. A municipal drinkign water service authority is adding softening to its

answer a, b , c and d , and show steps please thanks

2. A municipal drinkign water service authority is adding softening to its water treatment. The facility is treating the water flow of 18,000 m3/d with the following hardness/alkalinity: Ca2=347 mg/L; Mg2+=129 mg/L; HCO3=1256 mg/L I Softening chemicals are available at the follwing purity and cost: CaO: 67% purity at $82/1000 kg Na2CO3: 98% purity at $105/1000 kg NaOH: 98% purity at $105/1000 kg a. What is the annual cost ($/year) for lime and soda ash to be used as reagents in softening of the wter, assuming 100% removal of the hardness? b. What is the annual dry sludge mass (kg/year) generated from lime-soda ash softening of the water, assuming 100% removal of the hardness? c. Express "steady-state for any mass transfer system using a math equation. dWhat does it mean by "conservative system

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