Question

Please fully answer all parts of this question on environmental engineering. Please SHOW ALL WORK VERY CLEARLY. Clearly indicate exactly where all numbers come from. If you pull a number from a textbook, table or anyplace else other than the problem statement, please CLEARLY indicate what it is and where you got it from

A drinking water treatment plant is looking to change source waters from river water to groundwater. To assess this move, they collected water characteristics found in the Table below. Using this information: Component C K Na ca? Mg? Concentration 73 mg/L | 7 mg/L 40 mg/L 59 mg/L 18 mg/L 135 mg/L 120 mg/L 7.4 SO, нсо, pH 1. Calculate the water's Hardness, in mg/L of Cacoz 2. Calculate the water's Alkalinity, in mg/L of CaCO3-

Answer 1

llo Hardness in water due to Cat2 & Matz von-3 moleq mole equivalent of cat2 = 5940 3 40 - 2.95810 mole equivalent of Myth = 18x103 x2 = 1.5X103 mol- er २५ -3 Total mole equivalent = (2.95 +1.5) 410 = 4.45X10-3 molea e Total hardness a Ca co₂ = Total mol eq.x Atomic weight valancy = 4.450103 x 100 = 222.5x10 -3 9m ltr Total hardness = 222.5 mg/ett Al Kanity due to HCO3, Co2 &0h Present in water Here cog²= ongleto So Alkanity = H coz + oH mole equivalent of HCO3 = 120 x10 1.967 m molea. 61 - ltr PH = 7.4 [H+] = 10-t [oH] = 10 b ong/1tz mole equivalent of coh] = 10-6.0x1. mol eq. - 17 Ito total mole eq. = 1.967 X10-3 + 10-b. 17 = 1.967 x 103 mole eq Total alkanity as Caca = 1.967X10 3 xso - = 98.35 mg/oth - 1.967X10-3x so = 0.09839