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19 Nov 2019
50 points. A DWTP pumps groundwater as a raw water source. The relevant water quality parameters are as follows: Problem 1 Compound Concentration of the ion/compound (mg/L) 7.3 units 25 CO2 Ca HCO3 SO42 40 50 90 a) What is the dose of lime and soda (in mg/L as CaCOs) required to reduce the hardness to zero? b) How much CaCO3 and Mg(OH)2 sludge is produced (in mg/L as CaCO3)? c) If the DWTP treats 5 million gallons of water per day, and lime used (as d) If lime (as CaO) costs $200/tonne, what is the monthly cost for the lime e) If the DWTP treats 5 million gallons of water per day, and soda used (as f) If soda (as Na2CO3) costs $3000/tonne, what is the monthly cost for the g) If the sludge is 5% solids, what are the mass (kg/month) and volume cao) is 85% pure, what is the mass of CaO needed (kg/month)? needed ($/month)? Na2CO3) is 90% pure, what is the mass of Na2CO3 needed (kg/month? soda needed (S/month)? (m/month) of CaCO3 and Mg(OH)2 produced? Note: 1 tonne = 1,000 kg Problem 2 20 points. Calculate the lime and/or soda dose (mg/L as CaCO3) to soften the following water: Compound Concentration, mg/L as CaCO CO2 40 168 76 258 110 HCO3 SO42
50 points. A DWTP pumps groundwater as a raw water source. The relevant water quality parameters are as follows: Problem 1 Compound Concentration of the ion/compound (mg/L) 7.3 units 25 CO2 Ca HCO3 SO42 40 50 90 a) What is the dose of lime and soda (in mg/L as CaCOs) required to reduce the hardness to zero? b) How much CaCO3 and Mg(OH)2 sludge is produced (in mg/L as CaCO3)? c) If the DWTP treats 5 million gallons of water per day, and lime used (as d) If lime (as CaO) costs $200/tonne, what is the monthly cost for the lime e) If the DWTP treats 5 million gallons of water per day, and soda used (as f) If soda (as Na2CO3) costs $3000/tonne, what is the monthly cost for the g) If the sludge is 5% solids, what are the mass (kg/month) and volume cao) is 85% pure, what is the mass of CaO needed (kg/month)? needed ($/month)? Na2CO3) is 90% pure, what is the mass of Na2CO3 needed (kg/month? soda needed (S/month)? (m/month) of CaCO3 and Mg(OH)2 produced? Note: 1 tonne = 1,000 kg Problem 2 20 points. Calculate the lime and/or soda dose (mg/L as CaCO3) to soften the following water: Compound Concentration, mg/L as CaCO CO2 40 168 76 258 110 HCO3 SO42