Recycling Treated Municipal Wastewater for Industrial Water Use

Section 3
Inventory of Major WWTPs and Potential Industrial Reuse Demands
Craddock Consulting Engineers 3-23
In Association with CDM & James Crook
WWReuseTM1_Sec 3_final.doc
Table 3.12a. Industrial Water Use in the Mississippi River Headwaters Watershed
2004 Water Use, mgd
Industry Category Ground Water Surface Water Total
Agricultural Processing 6.49 0.00 6.49
Hydropower 0.00 0.12 0.12
Industrial Process Cooling - Once Through 3.58 0.51 4.09
Industrial Processing 0.87 0.00 0.87
Metal Processing 1.88 0.00 1.88
Mine Processing 0.24 0.00 0.24
Non-Metallic Processing 0.95 0.00 0.95
Nuclear Power Plant 0.05 346.60 346.65
Petroleum - Chemical Processing, ethanol 2.13 0.00 2.13
Power Generation 0.31 0.01 0.32
Pulp and Paper Processing 2.17 26.84 29.01
Sand and Gravel Washing 1.13 2.56 3.69
Steam Power Cooling - Once Through 0.19 544.49 544.68
Steam Power Cooling - Wet Tower 0.18 18.47 18.65
Steam Power Other than Cooling 1.36 0.00 1.36
Total 21.53 939.60 961.13
Source: MDNR, 2004
WWTPs
As the most populated watershed, the Mississippi River-Headwaters watershed has
the largest number of the WWTPs greater than 1 mgd and processes the most
wastewater. In 2005, the WWTPs in this watershed discharged collectively 230 mgd
from the 22 facilities in its borders. Table 3.12b lists the watersheds, their design
capacity, and 2005 discharge volume. The Met Council’s Metropolitan WWTP, located
in downtown St. Paul, provides treatment for the majority of the central and northern
part of the metro area. It processed approximately 190 mgd of wastewater in 2005.
Discussion of this and other Met Council facilities is reserved for Section 3.4.
The next largest municipal discharger on the upper Mississippi River is the St. Cloud
WWTP, which discharged 10 mgd in 2005, followed by several plants discharging 2 to
4 mgd. Several of these facilities are nearing capacity, indicated by flows exceeding
70% of the design capacity. These include Alexandria, Brainerd, Litchfield, Melrose,
Met Council-Metro WWTP, St. Cloud and Willmar. Many of these municipalities are
in the planning, design, or construction phase of an expansion. Task 2 will evaluate
this in more detail.