Transcript City of Alamogordo Water Resources Outlook

Desalination Implementation
by the City of Alamogordo
Eddie C. Livingston, MSCE, P.E.
Livingston Associates
New Mexico Forum on Reclaiming Produced/Brackish Water
for Beneficial Use
Hobbs, NM
July 22, 2003
City of Alamogordo
Annual Water Supply and Demand 2000 - 2040
25,000
20,000
Acre-Feet
Annual Water Demand
Water Rights
15,000
Firm Supply
10,000
5,000
0
2000
2005
2010
2015
2020
Year
Livingston Associates
Consulting Engineers
2025
2030
2035
2040
Desal Alternative
Develop 6 MGD - 13 MGD of new peak
day water supply
 Water quality to match spring source of
800 mg/L TDS
 Utilize brackish groundwater reserves
and desalination treatment

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Consulting Engineers
Livingston Associates
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Groundwater Availability
20 Million AF “recoverable” brackish
water TDS range of 1,000 - 4,000 mg/L
 Over a 40 year period would use <2%
 Well field pumping spread out along
mountain front - east of Highway 54 and
North of Tularosa

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Consulting Engineers
Desal Feasibility Study
Desalination (RO) best option
 Performed Pilot on well fields
 Identified well field (BLM)
 Preliminary environmental/cultural
 Identified plant site (State)
 Developed infrastructure plan
 Estimated project costs

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Ground Water Quality
Primarily calcium-sulfate
 TDS 65% to 90% of e-cond.
 Sulfates 30% to 50% of TDS
 Temp. 62F to 80F
 pH 6.7 to 7.3

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RO Pilot Program
Pilot RO for 45 to 60 days at each site
 Pilot 3 sites (1,500 mg/L; 2,500 mg/L and
3,500 mg/L TDS)
 Pilot proposed well field of 2,200 mg/L TDS
 Used irrigation well; 3 ph. power; water
rights; disposal of pilot water
 Record operating conditions for cost analysis

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Consulting Engineers
Mobile RO Pilot Unit
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6 pressure vessels
18 ea. 4X40 elements
Feed flows to 25 GPM
50% - 85% recoveries
Up to 10,000 TDS
CIP system
press; e-con; TDS; pH
Office/lab
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Consulting Engineers
Rosa del Sol RO Performance
Feed
 TDS = 3,160 mg/L
 Cl = 180 mg/L
 SO4 = 1,730 mg/L
 Hard = 1880 mg/L
 Feed = 135 psi
 Temp = 18.0C
 MDC120 @12.3 ppm
Product
 22 mg/L
 5 mg/L
 11 mg/L
 8 mg/L
 Recovery = 65%
 Rejection = 99.4%
 SDI = 0.56
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Villa del Sol RO Performance
Feed
 TDS = 2,380 mg/L
 Cl = 196 mg/L
 SO4 = 1260 mg/L
 Hard = 1520 mg/L
 Feed = 110 psi
 Temp = 21.2C
 MDC150 @ 8.2 ppm
Product
 70 mg/L
 13 mg/L
 21 mg/L
 25 mg/L
 Recovery = 72%
 Rejection = 98.8%
 SDI = 0.47
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Lazy/CT RO Performance
Feed
 TDS = 1,480 mg/L
 Cl = 255 mg/L
 SO4 = 563 mg/L
 Hard = 844 mg/L
 Feed = 107 psi
 Temp = 20.1C
 MDC150 @ 3.1 ppm
Product
 59 mg/L
 17 mg/L
 8 mg/L
 9 mg/L
 Recovery = 75%
 Rejection = 98.5%
 SDI = 0.78
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Snake Tank RO Performance
Feed
 TDS = 2,220 mg/L
 Cl = 147 mg/L
 SO4 = 1,370 mg/L
 Hard = 1,420 mg/L
 Feed = 91 psi
 Temp = 24.5C
 MDC150 @14.3 ppm
Product
 60 mg/L
 24 mg/L
 28 mg/L
 42 mg/L
 Recovery = 72%
 Rejection = 99.6%
 SDI = 0.72
Livingston Associates
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Snake Tank Site RO Pilot
Water Permeation Coefficient
40.00
35.00
30.00
Changed recovery
from 69% to 72%
20.00
15.00
Water Permeation Coeff.
10.00
5.00
Elapsed Time (Hours)
Livingston Associates
Consulting Engineers
93
4.
4
10
06
.5
10
55
.0
88
6.
5
83
9.
0
74
3.
0
69
5.
5
59
8.
2
55
6.
9
50
8.
2
47
6.
9
40
6.
4
33
2.
9
28
6.
4
23
7.
4
16
4.
9
11
7.
1
69
.6
0.00
0.
0
"A" Coeff.
25.00
Snake Tank Site RO Pilot
Salt Permeation Coefficient
2.50
2.00
1.50
Changed recovery
from 69% to 72%
1.00
0.50
Elapsed Time (Hours)
Livingston Associates
Consulting Engineers
93
4.
4
10
06
.5
10
55
.0
88
6.
5
83
9.
0
74
3.
0
69
5.
5
59
8.
2
55
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9
50
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2
47
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9
40
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4
33
2.
9
28
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4
23
7.
4
16
4.
9
11
7.
1
69
.6
0.00
0.
0
"B" Coeff.
Salt Permeation Coeff.
Snake Tank Site RO Pilot
Pressure Drop Coefficients
0.900
Changed
recovery from
69% to 72%
0.800
0.700
0.500
0.400
Delta P1 Coeff.
0.300
Delta P2 Coeff.
0.200
0.100
Elapsed Time (Hours)
Livingston Associates
Consulting Engineers
93
4.
4
10
06
.5
10
55
.0
88
6.
5
83
9.
0
74
3.
0
69
5.
5
59
8.
2
55
6.
9
50
8.
2
47
6.
9
40
6.
4
33
2.
9
28
6.
4
23
7.
4
16
4.
9
11
7.
1
69
.6
0.000
0.
0
Delta P Coeff.
0.600
Snake Tank RO Pilot Site
Net Driving Pressure
50.00
45.00
40.00
Net Driving Pressure
30.00
25.00
20.00
Changed recovery from
69% to 72%
15.00
10.00
5.00
Elapsed Time (Hours)
Livingston Associates
Consulting Engineers
5
0
10
06
.
10
55
.
93
4.
4
88
6.
5
83
9.
0
74
3.
0
69
5.
5
59
8.
2
55
6.
9
50
8.
2
47
6.
9
40
6.
4
33
2.
9
28
6.
4
23
7.
4
16
4.
9
11
7.
1
69
.6
0.00
0.
0
PNet (psi)
35.00
Wells/Plant Location
Facilities located 13 mi. N. of Tularosa
 Located to provide gravity flow to Plant
and into Alamogordo (energy savings)
 Wells on BLM and RO Plant on State
 Water quality about 2,200 mg/L TDS
 Infrastructure to Alamogordo allows
potential use by Tularosa, HAFB, etc.

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Livingston Associates
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RO Plant
Treat water down to <50 mg/L TDS
 Blend other well water to produce
overall <800 mg/L TDS water
 Approximate 60/40 blend
 Operate by gravity pressure and some
feed pumping
 Produce overall 84% recovery

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WELL BY-PASS
FOR BLENDING
PRE-FILTERS
TO DISTRIBUTION
RO
PERMEATE
RO ARRAY
HIGH PRESSURE
PUMP
POST-TREATMENT
CHEMICAL FEED
(ACID, SCALE
INHIBITOR)
BRINE
DISPOSAL
WELL
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Typical RO Skid
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Regional Partners
Supply potential other users
 Tularosa
 HAFB
 La Luz
 Other community water systems

Livingston Associates
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Project Costs
Phase 1 (2005 - 2015)
 6 MGD

– Capital
$27M
– O&M
$0.65/1,000 gals
– Amortized $1.65/1,000 gals
– Total
$2.25/1,000 gals
– Modular construction for expansion
– Install ultimate infrastructure now
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Concentrate Disposal
Concentrate 8,000 mg/L TDS
 Concentrate flow 16% of feed
 Evaporation Ponds for disposal
 Land application
 Solids produced
 Beneficial use

Livingston Associates
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Concentrate Evap Ponds
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Questions?
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