Recycling Treated Municipal Wastewater for Industrial Water Use

TM3: Recycled Wastewater System Components and Costs
Recycling Treated Municipal Wastewater for Industrial Water Use
Table 17. Comparison of Treatment Costs for Different Reclaimed Water Quality Supplies*
Cost of Service for Treatment, $/1000 gallons
Tertiary 1 Tertiary 2 Tertiary 3 Tertiary 4
Flow/
Conven- Membrane Membrane Ion
Demand, mgd tional Filtration Softening Exchange GAC UV
0.1 6.94 2.89 4.86 6.16 7.76 5.25
0.5 2.19 1.32 2.71 3.64 4.79 3.00
1 1.71 1.09 2.41 3.29 3.71 2.56
1.5 1.38 1.01 2.30 3.17 3.35 2.42
2 1.21 0.97 2.25 3.11 3.17 2.35
3 1.05 0.94 2.20 3.05 2.98 2.27
4 0.91 0.95 2.20 3.04 2.92 2.27
5 0.80 0.90 2.14 2.98 2.81 2.20
10 0.58 0.80 2.01 2.85 2.59 2.08
15 0.51 0.76 1.95 2.79 2.49 2.01
30 0.44 0.73 1.85 2.68 2.31 1.89
*In addition to water reuse base system costs
5.7 Cost Summary
The cost analysis indicates that there are economically viable applications to provide
treated wastewater effluent as a water supply to industries. The technology is
available and as competition increases in the membrane market, more economical
solutions can be anticipated to meet the specific water quality needs for a spectrum of
industries in Minnesota. Treatment costs were estimated to range from $0.50/1000
gallons for larger supplies (30 mgd) with water quality suitable for cooling water to
over $7.00/1000 gallons for smaller supplies (0.1 mgd) treated to meet stringent
industrial water requirements.
To provide a comparison of total system costs, a 5-mile transmission system was
evaluated as shown in Figure 15. The cost to deliver reclaimed water, inclusive of
transmission costs, and administrative/laboratory costs ranges from about $0.80 -
$16.50/1000 gallons.
The potential costs for a reclaimed water supply are shown in Table 18 for the general
industry categories. Costs are listed for the treatment and total system costs of a 5mile
transmission system. Appendices C (base system) and D (alternative water
supplies) provide the detailed cost curves to identify specific costs for different flows
and transmission distances. As expected, the range of costs is broad given the
diversity of industries in these general industry categories and the variable water
quality of WWTP effluent.
The higher costs reflect treatment to achieve water quality concentrations lower than
in the incoming water supply of most industries. Most industries treat their own
permitted supply or potable supply to achieve the higher quality of Tertiary-4 class
Craddock Consulting Engineers 41
In Association with CDM & James Crook
TM3-Component&Costs_0707