Recycling Treated Municipal Wastewater for Industrial Water Use

Figure 2.15. Metro Area Industrial Water Demand, 2005
Building Materials
Chemical Products
Electronic Products
Food Products
Health Care
Laundry
Medical Products
Metal Products
Other
Paper/Packaging
Photo/Printed Products
Power/Steam/AC
Public Facilities
Transportation
Source: Met Council, 2005
1.0
1.7
1.6
1.4
1.2
2.1
2.6
3.4
5.5
5.9
6.4
Section 2: Recycled Wastewater Demand & Supply
Recycling Treated Municipal Wastewater for Industrial Water Use
7.5
0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0
Water Use (mgd)
The total Twin Cities metro area industrial demand is estimated to be 75 mgd. This estimate is based on
an analysis of both databases to determine a reasonable estimate of the industrial demand supplied by
water utilities. Industries that supply their own water through MDNR appropriations permits used
approximately 30 mgd in 2004. The Twin Cities metro area water utilities used 350 mgd in 2004.
Assuming that 13% of potable water supply customers are industries, another 45 mgd of industrial
demand is supplied by water utilities.
2.4 WWTP Focus – Empire and Rosemount WWTP Inventories
This study inventoried the industries in proximity to major WWTPs in the seven-county Twin Cities
metro area. This section provides the inventory for the Met Council’s Empire & Rosemount WWTPs,
located in the Lower Mississippi River watershed. Appendix II-1 provides the inventories for the other
WWTPs.
The Empire WWTP was recently expanded from 9 mgd to 24 mgd and the 1.3 mgd Rosemount WWTP
will be phased out with wastewater from its service area treated at the Empire WWTP. The Empire
WWTP, which currently discharges to the Vermillion River, will have a new discharge to the Mississippi
River in the vicinity of the one currently used by the Rosemount WWTP. Figure 2.16 identifies the
industries near each plant and Table 2.7 lists those within a 5-mile radius of each plant. The outfall for the
Empire WWTP to the Mississippi River is also shown on Figure 2.16. The list of industries is restricted to
the radius around each plant, but could be broadened to include industries along the outfall.
As described previously in the Lower Mississippi River Watershed Inventory section, Flint Hills
Resources is the high water demand industry using ground water in the area, withdrawing over 6 mgd in
2004. The industry with the next largest water use is Aggregate Industries, with a demand of 1.1 mgd,
supplied by surface water at a facility near the Mississippi River. Another Aggregate Industries facility is
located closer to the Empire WWTP and uses a ground water supply of 0.4 mgd. The industry with the
largest water demand near the Empire WWTP is Marigold Foods, which uses 0.32 mgd of ground water
supplied by its own well field. Another food product industry, Kemps, has a demand of 0.25 mgd. The
other industries in the area have a combined demand of 0.32 mgd.
Metropolitan Council Environmental Services 27
10.6
14.7