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Desalination: A National Perspective
OpEx - Cost of Money Sensitivity Analysis
Membrane Life 5 yrs; Baseline Operating Pressure; $0.07/kWh; 189km3/d
Interest Rate:
3%
5%
7%
OpEx on Capital - Conventional Pretreatment
25-yr depreciation;
$0.20
$0.25
$0.30
OpEx on Capital - UF/MF Pretreatment
25-yr depreciation; 5% cost of capital
$0.21
$0.25
$0.31
Conventional Pretreatment
$0.07
$0.07
$0.07
Chemicals ($/m3)
$0.04
$0.04
$0.04
Filters ($/m3)
$0.00
$0.00
$0.00
Energy ($/m3)
$0.03
$0.03
$0.03
UF/MF Pretreatment
$0.03
$0.03
$0.03
Chemicals ($/m3)
$0.01
$0.01
$0.01
Membranes ($/m3)
$0.01
$0.01
$0.01
Energy ($/m3)
$0.01
$0.01
$0.01
First Pass SW RO
$0.22
$0.22
$0.22
Chemicals (antiscalant mostly, $/m3)
$0.02
$0.02
$0.02
Membranes (5-yr life, $/m3)
$0.02
$0.02
$0.02
Energy ($/m3)
$0.19
$0.19
$0.19
Second Pass SW RO (optional)
$0.05
$0.05
$0.05
Chemicals (NaOH mostly, $/m3)
$0.01
$0.01
$0.01
Membranes (5-yr life, $/m3)
$0.01
$0.01
$0.01
Energy ($/m3)
$0.03
$0.03
$0.03
Permeate Conditioning
$0.02
$0.02
$0.02
Chemicals ($/m3)
$0.02
$0.02
$0.02
Energy ($/m3)
$0.01
$0.01
$0.01
Total Labor
$0.03
$0.03
$0.03
Total Maintenance
$0.04
$0.04
$0.04
Total OpEx Costs - Conventional Pretreatment ($/1000 gallons) =
$0.64
$0.69
$0.74
Total OpEx Costs - UF/MF Pretreatment ($/1000 gallons) =
