TM 5-813-8
y 235.3
z [124,400 - 28.8(235.3)]/398.8
z 295
x 500 - 235.3 - 295 = -30.3
but the Total Dissolved Solids in this corner is:
?
-30.3(95.5) + 235.3(851) + 295(729) 250,000
412,401.65 250,000
Therefore, this corner is outside of the TDS constraint. See figure A-22 point F.
b. Total Dissolved Solids - Chloride Pair
Total Dissolved Solids 755.5y + 633.5z 202,250
-
(633.5/20)Cl = 14,253.75y - 633.5z 3,167,500
15,009.25y 3,369,750
y 224.5
z [202,250 - 755.5(224.5)]/633.5
z 51.5
x 500 - 224.5 - 51.5 = 224
=
and for Sulfate SO4 ;
?
224(1.2) + 224.5(30) + 51.5(400) 125,000
27,603.8 125,000
Therefore, this blend will have less than the maximum allowable sulfate concentration.
c. Total Dissolved Solids - Sulfate Pair
Total Dissolved Solids 755.5y 202,250 - 633.5z
=
-755.5y 3,263,340.3 - 10461.6z
(755.5/28.8) SO4 =
∴solving for the equal condition only
202,250 - 633.5z = 3,263,340.3 - 10,461.6z
z = 311.5
y [202,250 - 633.5(311.5)]/755.5
y 6.5
using the equal condition makes z 311.5
x 500 - 311.5 - 6.5 = 182
-
and for chloride Cl
182(50.0) + 6.5(500) + 311.5(30) 125,000
21,695 125,000
Therefore, this blend will have less than the maximum allowable chloride C1- concentration.
Blends containing only high quality second-stage product water and one of the remaining waters x or y could be
most economical.
d. Well Water z and Water x
1. Sulfate limited
z 500 (250 - 1.2)/(400 - 1.2)
z 311.9 so x 188.1
2. TDS limited
z 500(500 - 95.5)/729 - 95.5)
z 319.25 so x 180.75
3. Chloride cannot limit since both have chlorides below 250.
e. Single-Pass Reverse Osmosis Water y and Water x.
A-36
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