Recycling Treated Municipal Wastewater for Industrial Water Use
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Recycling Treated Municipal Wastewater for Industrial Water Use

Recycling Treated Municipal Wastewater for Industrial Water Use Recycling Treated Municipal Wastewater for Industrial Water Use

archive.leg.state.mn.us
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17.08.2013 Views

WWTP 1 - 2 - 3 - 4 - 5 - 1 Treatment Existing Facilities Potential New Facilities New or Refurbished Facilities 2 Additional Disinfection Non- Seasonal Storage Additional treatment processes to meet industrial water supply requirements Additional disinfection for reclaimed regulatory limits and residual in the transmission system Storage for smaller WWTPs and where industrial demand does not match WW flow Pump station to supply industries Reclaimed water transmission main and branch transmission lines 3 4 5 Pump Station Industry A Industry C Industry B WWTP Site Transmission Area/Industry Site 6 - 7 - 6 7 Treatment Treatment Industry D Booster pump for transmission to some industries Industry on-site treatment Schematic shows possible combination of facilities for Industries A-D supplied from reclaimed water transmission main line Figure 2. Water Reuse System Conceptual Model

3.0 Treatment 3.1 Industrial Water Quality Requirements TM3: Recycled Wastewater System Components and Costs Recycling Treated Municipal Wastewater for Industrial Water Use There are two water quality drivers that affect the treatment requirements for reclaimed water: The regulatory requirements which are typically for the protection of public health and the environment and focus on microbiological parameters. The user-specific requirements for the water supply, which in the case of industries is a very specific set of water quality criteria for a given facility. 3.1.1 Regulatory Requirements Reclaimed water for industrial use in Minnesota is currently required to meet regulatory limits based on the California Water Recycling Criteria, Title 22 California Code of Regulations (Title 22). The complete list of criteria is included in Appendix A, Exhibit 1. The criteria specific to industrial applications (excluding any irrigation uses) are listed in Table 1. The Minnesota Pollution Control Agency (MPCA) handles permitting recycled wastewater as part of the National Pollutant Discharge Elimination System (NPDES) permit process. The MPCA establishes recycled wastewater water quality criteria on a case-by-case basis and bases its assessment on the Title 22 criteria. Therefore, the Title 22 criteria will serve as the basis for selection of treatment technologies to meet regulatory requirements in this study. Table 1. California Water Recycling Criteria (Industrial Uses) Type of Use Total Coliform Limits Treatment Required Cooling water where no mist created ≤ 23/100 ml Process water where no worker contact Boiler feed Mixing concrete 1 ≤ 240/100 ml Secondary (max in any 30- Disinfection day period) Cooling water where mist created 2 Process water where worker contact likely ≤ 2.2/100 ml 1 ≤ 23/100 ml (max in any 30day period) Secondary Coagulation 3 Filtration Disinfection Source: Adapted from State of California [2000a]. 1 Based on running 7-day median; daily sampling is required. 2 Drift eliminator required; chlorine or other biocide required to treat cooling water to control Legionella and other microorganisms. 3 Not required under certain conditions. Craddock Consulting Engineers 5 In Association with CDM & James Crook TM3-Component&Costs_0707

WWTP<br />

1 -<br />

2 -<br />

3 -<br />

4 -<br />

5 -<br />

1<br />

Treatment<br />

Existing Facilities<br />

Potential New Facilities<br />

New or Refurbished Facilities<br />

2<br />

Additional<br />

Disinfection<br />

Non-<br />

Seasonal<br />

Storage<br />

Additional treatment processes to meet industrial<br />

water supply requirements<br />

Additional disinfection <strong>for</strong> reclaimed regulatory limits<br />

and residual in the transmission system<br />

Storage <strong>for</strong> smaller WWTPs and where industrial<br />

demand does not match WW flow<br />

Pump station to supply industries<br />

Reclaimed water transmission main and branch<br />

transmission lines<br />

3<br />

4<br />

5<br />

Pump Station<br />

Industry A<br />

Industry C<br />

Industry B<br />

WWTP Site Transmission<br />

Area/Industry Site<br />

6 -<br />

7 -<br />

6<br />

7<br />

Treatment<br />

Treatment<br />

Industry D<br />

Booster pump <strong>for</strong> transmission<br />

to some industries<br />

Industry on-site treatment<br />

Schematic shows possible<br />

combination of facilities <strong>for</strong><br />

Industries A-D supplied from<br />

reclaimed water transmission<br />

main line<br />

Figure 2. <strong>Water</strong> Reuse System Conceptual Model

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