(GP/GT) for Additional Water Supply in the Lower Rio Grande

PRELIMINARY EDR/RO COSTS & PERFORMANCE STUDY
F'111 E:UGENE R, ~E:AHL
Ionics, Inc.
5455 Garden Grove Blvd
Suite 321
Westminst~r, CA 92683
SUB:
REF:
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CORRECTION TO DATA
State of Texas Water Development Board Study
Ionics memo dated 4 DEC 98
Ionics M3 w 272G0
tel: 714-893~1845
!A~~ 714-S92-1S92
---~- ________ .~ ____________________ M~ ___________________ ~ ___________ _
Your cell t~ me yesterday di~cussed two topics. First, the EDR brino
TDS values illustratQd in our D~C MeMO. You, th~~~ do need to be
)r~ected, as does the 2nd iteM - our OtM number.
(1) CORRECTED EDR BRINE TDS VALUtS:
Overall performances of EDR and ~O indicated on original ilow schematic
diagrams were correct, 1~ terms of wQ~Qr re~overy, product
quality, otc. RO brine qualities vere correct - EDR hrine qualities
need to be smend~d. Som9 oriainally indieated EDR bri~. TDS valu~~
were too low, while SOM& were high. Have markQd up the original
GROUP 1 - GROUP 4 flow schematics to indicate correoted ~OR brine
Qualities. Have also attaoned 2 paQQS oi eomputer g~n~~at~d watQ~
qu~lit1es. These indicate the "mean" rav water qu~lity used fo~
GROUP 1 thru GROUP 4 decigns, as voll as EDR product, steady-state
brine and averggod brin~ TDS. I ~ould ~hirtk you oould eQsl1y ohange
theBe figures on your r~port via PLC/aomputer.
(2) COR~ECTED _____ ~ ___ ~ EDR _____ O&M w _____ COST; _
Your right again ~ the EOn O&M numbers don't add up correctly. I
checked all the calculations mado for RO and EDR. Problems WQ~e
used by an Grrant hand held cal~uletor whleh vas ~eplaoed lQt~ last
,ear, Sinoe Qll calc'. vere ohecked, we als~ talked iurther yester­
OQY with RO memhrano manu£ecturers to hav~ them comm~nt on oriQinal
designs/costs generated by thim writer.
Have attached two nev data sheets to replace the O~M breakout
or1ginally indioatgd for GROUP 11 wat~~ OQ~O, a~d to rcplao~ th~