Recycling Treated Municipal Wastewater for Industrial Water Use

Section 3
Inventory of Major WWTPs and Potential Industrial Reuse Demands
Craddock Consulting Engineers 3-51
In Association with CDM & James Crook
WWReuseTM1_Sec 3_final.doc
Table 3.26. St Croix Valley WWTP Industries Within a 5 Mile Radius
DNR Water Industry Category - MCES Business
Industry Name
Permit Source*
DNR
Category
Andersen Corporation** x M&G Non-Metallic Processing Building Materials
DiaSorin Inc** M Non-Metallic Processing Medical Products
NSP CO DBA Xcel Energy x S
Steam Power - Other
Than Cooling
Sterling Water Inc dba Culliga M Other Other
* M: Municipal; G: Ground Water; M & G: Municipal and Ground Water: S: Surface Water.
** Listed under Non-Metallic Processing for the industry code of the DNR database.
3.4 Inventory Summary
Ground Water Supply
The availability of higher quality ground water, typically sought first for municipal and
industrial purposes, is a key factor in planning for growth in most of Minnesota. The
summary of watershed inventories presented in Table 3.27 shows there are several
areas of the state with limited ground water supplies. These areas are in the Des Moines
River and Missouri River watersheds, in the southwest part of the state, northwestern
Minnesota in parts of the Red River of the North watershed, and in the Rainy River and
Western Lake Superior watersheds, in north central and northeastern Minnesota.
There are also community-specific water supply limitations in quality and quantity,
as seen in the southwest and northwest metro areas, that are restricting withdrawals
from certain aquifers. Ground water contamination is found throughout the state and
certain aquifer characteristics make some aquifers a less reliable supply, as in the karst
area of the Lower Mississippi River watershed. In general, the water quality of an area
and susceptibility to contamination must be assessed on a site specific basis and is not
a good indicator of regional water supply limitations.
Supply vs. Demand
The comparison of historic ground water use by industries and WWTP effluent
discharge flows indicates that each watershed currently processes enough wastewater
to supply these industrial needs, but as the spatial inventories demonstrated, the
industries are not usually in proximity to WWTPs. The annual WWTP (greater than 1
mgd design capacity) discharges totaled 425 mgd, while total industrial water demand
was 445 mgd (excludes power generation industry) and industrial ground water
demand totaled 60 mgd.
The statewide assessment of industrial demand performed under this project includes
only major users that have their own permitted water supply, based on a compilation
of the DNR Appropriations Permit database. There are also industries that use
significant quantities of water provided by a municipal water system and these
industries are not captured in the inventory. The metro area analysis included
industries that use a municipal (potable) water supply (only or in combination with a
DNR permitted supply) and provided a more detailed categorization of industry types,
based on a compilation of the Met Council’s Industrial Discharger (User) database.