Recycling Treated Municipal Wastewater for Industrial Water Use

Section 3
Inventory of Major WWTPs and Potential Industrial Reuse Demands
Major WWTPs (over 1 mgd design capacity) are identified by the triangles on Figure
3.6, with relative size shown for each facilty’s design capacity. While it may be
feasible for smaller plants (with design capabilities less than 1 mgd) to supply
industry’s reclaimed water, this initial analysis focused on opportunities associated
with larger WWTPs. Larger treatment facilities are more likely to have the staff and
municipal infrastructure to support treatment upgrades and the administrative role
that is required. The next phase of work may consider smaller WWTPs if there
appears to be a close correlation between a specific WWTP effluent supply and major
industrial water demands in that area.
3.2 Watershed Inventories
Overview
The inventory of industrial water users and municipal wastewater treatment plants is
summarized below for each of the ten major watersheds in Minnesota, depicted in
Figure 3.7a. As discussed in Section 1, the data presented are only for industries with
permits for water withdrawal. These industries are referenced as “major” industrial
water users. Industries that use a municipal water supply (“waterworks”) for their
water source are not represented in this analysis. This inventory is based on existing
industries and WWTPs. Task 2 will incorporate forecasts of industrial and population
growth to identify future water reuse opportunities.
The industrial reuse customer inventory for each watershed is presented through four
main exhibits:
Map of major industrial water use and major WWTPs (over 1 mgd design capacity)
Statistics on industrial water use (Source: DNR Appropriations Permit Program,
2004)
List of WWTPs, their design capacity (based on their NPDES Permit average wet
weather flow unless otherwise stated) and historic flows (Source: MPCA
Dischargers Database [2005] based on Discharge Monitoring Reports submitted by
each facility in requirements with their NPDES Permit). Appendix C contains the
complete list of WWTPs with design capacities greater than 1 mgd.
List of industries, their water use, and their proximity to a WWTP
o Appendix C contains the complete industry lists for all watersheds. In the
Minnesota River, Mississippi River – Headwaters and Lower Mississippi River
watersheds, the distance between an industry and a WWTP was determined for
industries within a 5-mile radius. A 10-mile radius was used for the other
watersheds.
o Summary industry lists are provided in this section for watersheds with larger
numbers of industries. The summaries list the industries that are closest to a
WWTP, within a defined radius. The radius varies with each watershed, and is
3-6 Craddock Consulting Engineers
In Association with CDM & James Crook
WWReuseTM1_Sec 3_final.doc