Recycling Treated Municipal Wastewater for Industrial Water Use

Section 3
Inventory of Major WWTPs and Potential Industrial Reuse Demands
Craddock Consulting Engineers 3-21
In Association with CDM & James Crook
WWReuseTM1_Sec 3_final.doc
watershed varies from low to high. Surficial sand aquifers have shown nitrate
contamination.
The Minnesota River watershed dischargers will be affected by the TMDL for the
Minnesota River and the downstream Lake Pepin TMDL. The agricultural practices
and natural characteristics of this watershed have contributed to making it a
significant contributor to phosphorus and solids loadings at Lake Pepin. This
watershed will be an integral part of the TMDL process and receiving stream
discharge limits could push some municipalities to consider wastewater reuse.
Table 3.11b. WWTPs in the Minnesota River Watershed
Design 2005 Ann Flow as %
Capacity, Avg Flow, of Design
Facility Name
mgd mgd Capacity
Fairmont WWTP 3.9 1.595 41%
Granite Falls WWTP 1.111 0.477 43%
Madelia WWTP 1.31 0.907 69%
Mankato WWTP 11.25 6.861 61%
Marshall WWTP 4.5 2.5180 56%
Met Council - Blue Lake WWTP 37 28.420 77%
Met Council - Seneca WWTP 38 23.353 60%
Montevideo WWTP 3.0 1.083 36%
New Prague WWTP 1.378 0.662 48%
New Ulm WWTP 6.77 2.582 38%
St James WWTP 2.960 1.032 35%
St Peter WWTP 4.0 1.170 29%
Waseca WWTP 3.5 1.580 45%
Wells Easton Minnesota Lake WWTP 1.088 0.516 47%
Winnebago WWTP 1.7 0.592 35%
Total
Source: MPCA, 2005
122.47 73.348 60%
Note: Willmar WWTP discharges into the Minnesota River, but the facility resides in the Mississippi River-Headwaters. It is
included with Mississippi River-Headwaters watershed summary.
Mississippi River-Headwaters (Upper)
Industrial Water Use
The Mississippi River-Headwaters or Upper Mississippi River watershed has the
most diverse set of potential reuse industries, as shown in Table 3.12a and Figures
3.12a and 3.12b. Cooling water, mainly for once-through systems for steam power and
nuclear power facilities, is the dominant use of water by industries, totaling about 800
mgd. The largest water users, outside of the power generation industry, are for pulp
and paper processing at Blandin Paper Company, Grand Rapids and International
Paper Company, St. Cloud. However, since both use Mississippi River water and the
municipality’s use river water as their source, there is no added benefit to the ground
water supply systems in those communities if they were reclaimed water customers.
Agricultural processing industries were the largest user of ground water, using 6.5
mgd in 2004. Metal processing, petroleum/chemical processing, and smaller pulp &
paper facilities withdrew around 2 mgd each from the local aquifers in 2004.