Recycling Treated Municipal Wastewater for Industrial Water Use
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Recycling Treated Municipal Wastewater for Industrial Water Use

Recycling Treated Municipal Wastewater for Industrial Water Use Recycling Treated Municipal Wastewater for Industrial Water Use

archive.leg.state.mn.us
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17.08.2013 Views

Cost of Service, $/1000 gallons 8.00 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00 Effluent Classification T=Tertiary; Levels 1-4 T1-Conventional T2-Membrane Filtration T3-Membrane Softening T4-Ion Exchange T4-GAC T4-UV 0.1 0.5 1 1.5 2 3 4 5 10 15 30 Reclaimed Water Flow/Demand, mgd Figure 14. Comparison of Treatment Costs in Addition to Base System Costs

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

Cost of Service, $/1000 gallons<br />

8.00<br />

7.00<br />

6.00<br />

5.00<br />

4.00<br />

3.00<br />

2.00<br />

1.00<br />

0.00<br />

Effluent Classification<br />

T=Tertiary; Levels 1-4<br />

T1-Conventional<br />

T2-Membrane Filtration<br />

T3-Membrane Softening<br />

T4-Ion Exchange<br />

T4-GAC<br />

T4-UV<br />

0.1 0.5 1 1.5 2 3 4 5 10 15 30<br />

Reclaimed <strong>Water</strong> Flow/Demand, mgd<br />

Figure 14. Comparison of Treatment Costs in Addition to Base System Costs

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