Recycling Treated Municipal Wastewater for Industrial Water Use

TM3: Recycled Wastewater System Components and Costs
Recycling Treated Municipal Wastewater for Industrial Water Use
Table 16. Unit Construction and Project Costs for Force Mains 1
Unit Construction Cost , $/lf Unit Project Cost 2, $/lf
Diameter Urban Rural Urban Rural
(inches) Area Area Area Area
4 54 44 97 79
6 59 48 106 86
8 64 53 115 95
10 71 60 128 108
12 78 66 140 119
14 87 76 157 137
16 105 93 189 167
18 117 105 211 189
20 131 119 236 214
24 158 146 284 263
30 196 180 353 324
36 241 224 434 403
42 295 277 531 499
48 373 353 671 635
54 434 413 781 743
60 495 470 891 846
1 Based on the following:
-Sept. 2006 dollars, ENR CCI = 7763
-Mean Indices, 2006 and Cost Tool with detailed unit costs (App. B, Exhibit 1)
-Average depth of installation for force mains assumed to be 8 ft.
-4 to 24” pipe is PVC; >24” is DIP
2 Project unit costs based on master planning level assumptions: 50% for undeveloped
design detail (includes allowance for related appurtenances).
Operation and Maintenance Costs
Transmission system operations costs characterized for this cost model include
electrical power costs and a unit cost per mile for equipment and labor to maintain the
distribution system. The total dynamic head was calculated for a range of flows and
pipe lengths to estimate the pumping costs. Regression analysis was used to provide
the relationship of power costs to flow at various pipe lengths. Appendix B
documents this analysis.
The cost to maintain the transmission pipe system is based on the length of the pipe.
The unit cost selected, $5,500 per mile per year, is based on WWTP records for
maintenance of reclaimed water transmission system for Cary, North Carolina,
escalated for larger flows (CDM, 2004). It also compares reasonably to literature
references (Gumerman et al, 1992)
Craddock Consulting Engineers 33
In Association with CDM & James Crook
TM3-Component&Costs_0707