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) =

$0.61

$0.65

$0.71



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