Recycling Treated Municipal Wastewater for Industrial Water Use

Table 13
WATER REUSE SYSTEM COST OF SERVICE ASSUMPTIONS AND SUMMARY RESULTS
Blue = Values to input
Capital Cost and Debt Financing Assumptions
Summary of Capital Cost Estimates
Total Capital Cost $1,412,830 Description Total Cost
Amount of Grant Funding $0 Treatment Facilities $180,000
Municipal % of Up-Front Capital 100% Storage Facilities $0
Other % of Up-Front Capital 0% Pump Station $485,630
Debt Term (Years) 20 Piping $747,200
Annual Interest Rate 5.00% TOTAL CAPITAL $1,412,830
Issuance Costs, % of Capital 1%
Annual Avg Flow/Demand (MGD) 1.0
Operation and Maintenance Cost Items
Lab, Chemicals & Power Maintenance
Length of Distribution System (mi) 1.0 Lab Costs, $ $20,000 Pump System Labor, hrs/wk 4
Sodium Hypochlorite, $/gal of 12.5% $0.70 Pump System Equip, % capital 1%
Chlorine Dose, mg/L (year-round, see Note A) 7 Treatment Facilities, % capital 5%
Electrical Power, $/kwhr $0.045 Distribution System, $/mile $5,500
FTE Annual Salary with Benefits, $
Finance, Operations, Cust Service $80,000
Legal $150,000
Engineering $100,000
Estimated Total Type of Cost: Estimated Cost
Cost Components Basis/Methodology Cost in Year 1 Fixed or per
(2007) Variable? 1,000 Gallons
CAPITAL Debt Service (Capital Cost) Based on debt service payment $109,050 Fixed $0.30
Pumping System
Maintenance Labor hours/week at operator rate input-see Note B $8,800 Combination $0.02
Equipment Maintenance Based on % of capital cost input $4,856 Combination $0.01
OPERATION Electrical Power Based on per Kwh rate input; see Note C $14,736 Variable $0.04
AND Reuse Treatment at WWTP
MAINTENANCE Chlorine Disinfection $/gallon at %Conc input; see Note A $14,342 Variable $0.04
Other Chemicals/Misc From Treatment Module $0 Variable $0.00
Laboratory Lab cost input $20,000 Fixed $0.05
Electrical Power From Treatment Module $0 Variable $0.00
Equipment Maintenance Based on % of capital cost input $9,000 Combination $0.02
Distribution System Maintenance Equals water system cost/mile-see Note B $5,500 Combination $0.02
General System Management
GENERAL Engineering 0.15 FTE base; .05% increase per mgd >1 $15,000 Combination $0.04
AND Finance and Accounting 0.15 FTE $12,000 Combination $0.03
ADMINISTRATIVE Legal 0.05 FTE $7,500 Combination $0.02
Customer Service 0.05 FTE $4,000 Combination $0.01
TOTAL OF ALL COST COMPONENTS FOR SYSTEM: $0.62
NOTES:
A - based on a dose of 6.0 mg/l for additional disinfection and residual disinfection during Apr-Oct when MN WWTPs disinfect and 9 mg/l for Nov-Apr to provide main disinfection and residual for transmission.
B - escalates 10% for flows from 1-10 mgd and 30% for flows greater than 10 mgd.
C - costs based on cost curves developed and included in separate worksheet
In addition to the reclaimed water costs, customers will incur internal costs for installation, operation, and maintenance of point-of-use treatment systems needed to use the
reclaimed water for the facilities specific needs.