Recycling Treated Municipal Wastewater for Industrial Water Use

Section 3
Inventory of Major WWTPs and Potential Industrial Reuse Demands
The Lewis and Clark Rural Water System will draw water from a well system near the
Missouri River southwest of Vermillion, South Dakota. The water will be diverted,
treated and distributed through a network of pipelines, pump stations,
interconnections and storage reservoirs to service connections with each of the 15
municipalities and 5 rural water systems of South Dakota, Iowa, and Minnesota that
are currently members of the Lewis & Clark Rural Water System. The system is
designed for a maximum capacity of 27.2 mgd with an average delivery of 19.6 mgd.
This project has been pursued over the past two decades and construction was
initiated in Minnesota in 2005.
Lower Mississippi River
Industrial Water Use
The Lower Mississippi River watershed has a diverse base of industries, as
summarized in Table 3.10a and Figures 3.10a and 3.10b. The largest water use is
related to power generation facilities (nuclear power plant, steam power cooling and
miscellaneous power generation uses): averaging 578 mgd in 2004, of which all but 1
mgd was obtained from surface water supplies. The Prairie Island Nuclear Plant used
over 500 mgd in 2004 and another 70 mgd was used for once-through cooling at the
Xcel facility near Red Wing and the Rochester Public Utilities plant. There are several
agricultural processing facilities in this watershed with a combined water use of 2.9
mgd in 2004. Flint Hills Resources withdrew 7 mgd from its set of wells for processing
of petrochemical products.
Table 3.10a. Industrial Water Use in the Lower Mississippi River Watershed
2004 Water Use, mgd
Industry Category
Ground
Water Surface Water Total
Agricultural Processing 2.89 0.00 2.89
Industrial Process Cooling - Once Through 0.38 0.01 0.39
Metal Processing 0.70 0.00 0.70
Non-Metallic Processing 1.02 0.00 1.02
Nuclear Power Plant 0.09 505.84 505.93
Petroleum - Chemical Processing, ethanol 7.00 0.00 7.00
Power Generation 0.55 0.00 0.55
Sand & Gravel Washing 0.27 1.58 1.85
Steam Power Cooling - Once Through 0.00 71.38 71.38
Steam Power Cooling - Wet Tower 0.41 0.00 0.41
Total 13.31 578.81 592.12
Source: MDNR, 2004
WWTPs
There are 12 municipal WWTPs in this watershed with design capacities greater than 1
mgd. Table 3.10b summarizes the design capacity and historic flows for the plants.
There are three facilities within 70% of the design capacity: Owatonna, Plainview-Elgin,
and Rochester. Rochester is nearing completion of construction for an expansion to 24
3-14 Craddock Consulting Engineers
In Association with CDM & James Crook
WWReuseTM1_Sec 3_final.doc