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<br />4-13
<br />
<br />The existing lime feed equipment is adequately sized but due to its age, the City
<br />should schedule its replacement.
<br />
<br />Polymer System. The existing polymer equipment is too small for a full-time
<br />. polymer operation. The existing equipment can be used to test polymers as coagulant aids
<br />and filter aids. If polymer is found to be useful, even on a seasonal basis, a permanent
<br />polymer feed systeni should be installed.
<br />
<br />Soda Ash. The BctaSSO WI'P docs not presently have a soda ash system, but a
<br />system is recommended in the May 1990 Corrosion Control Evaluation Study by Black &
<br />Veatch. We do not concur with this recommendation, but for budgetary purposes, the
<br />addition of a new soda ash system is assumed. .
<br />
<br />4.2.6 Chemic:aI Usage
<br />
<br />Table 4-4 contains a snmm..'Y oi chemical usage data for the Betasso WTP for 1989.
<br />This data points to no apparent operational problems, however, the increased use of lime
<br />is recommended to raise pH and calcium levels as discussed previously. Also, improved
<br />chemical mixing and/or the use of polymers should lead .to a reduction in coagulant
<br />consumption.
<br />
<br />Table 4-4 Betasso WI"P - nu.mica1 Usage, 1989 .
<br />
<br /> Alum Lime ChloriDe Fluoride
<br />MODth Ibs mgll Ibs . mgll Ibs mgll Ibs mlVl
<br />JaDuary 36,720 12.04 18.644 6.10 7,053 2.31 4,283 1.40
<br />February 34,223 . .12.13 14,009 4.':17 6.980 2.47 4,215 1.19
<br />March 44,815 17.93 18,009 7I1 8,699 2.90 3,343 lI1
<br />April 54,370 23.60 22,081 9.58 8,803 3.82 3,348 1.67
<br />May 78,898 20.78 29,819 7.86 13,321 3.51 6;m 1.64
<br />June 92,042 19.72 33,654 7.21 15,533 3.33 1,653 1.70
<br />July 123,131 14.01 46,767 5.32 24,234 2.76 1,973 1.40
<br />August 68,609 l3.21 28,414 5.4S 14,382 2.77 2,460 1.42
<br />Septembet 63,447 12.94 22,8S5 4.66 13,478 2.75 4,634 1.39
<br />Oc:tober 48,OS2 13.85 20,756 5.98 99,soo 2.87 4,204 1.40
<br />November 26,210 13.82 10,786 5.69 6,066 3.20 947 1.43
<br />Dea:mber 29,980 14.98 8,868 4.43 6,121 3.06 3,198 1.60
<br />Tola! 700,4':17 274,562 134,630 40,965
<br />Average 15.2S 5.98 2.93 1.47
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