Process Unit Operation Costs

Conventional pretreatment

$133

$115

$106

UF/MF pretreatment

$150

$130

$120

First-pass SW RO

$1,239

$1,069

$989

Second-pass SW RO (optional)

$140

$122

$113

Total Process Costs

Conventional Pretreatment & 2-Stage RO Process ($/m³)

$1,512

$1,306

$1,208

OpEx on capital

25-yr depreciation; 3% cost of capital

$0.24

$0.20

$0.19

25-yr depreciation; 5% cost of capital

$0.29

$0.25

$0.23

25-yr depreciation; 7% cost of capital

$0.35

$0.30

$0.28

Conventional Pretreatment & 2-Stage BW RO Process ($/m³)

$413

$359

$332

OpEx on capital

25-yr depreciation; 3% cost of capital

$0.06

$0.06

$0.05

25-yr depreciation; 5% cost of capital

$0.08

$0.07

$0.06

25-yr depreciation; 7% cost of capital

$0.10

$0.08

$0.08

UF/MF Pretreatment & 2-Stage RO Process ($/m³)

$1,529

$1,321

$1,222

OpEx on capital

25-yr depreciation; 3% cost of capital

$0.24

$0.21

$0.19

25-yr depreciation; 5% cost of capital

$0.29

$0.25

$0.24