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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TM4: WWTP Effluent Quality Recycling Treated Municipal Wastewater for Industrial Water Use Figure 27. Effluent Ammonia and Number of Municipal WWTPs in Minnesota >10 mg/L, 6.5 mgd (0.9%) 5-10 mg/L, 24 mgd (3.1%) 1-5 mg/L, 128.5 mgd (16.8%) < 1 mg/L, 64 WWTPs (11.0%) not measured, 139.6 mgd (18.3%) 1-5 mg/L, 22 WWTPs (3.8%) 5-10 mg/L, 12 WWTPs (2.1%) >10 mg/L, 4 WWTPs (0.7%) not me a sure d, 481 W W T Ps (82.5%)

TM4: WWTP Effluent Quality Recycling Treated Municipal Wastewater for Industrial Water Use Craddock Consulting Engineers 23 In Association with CDM & James Crook TM4-WWTP Eff Quality_0707.doc Fecal Coliforms Fecal coliforms are commonly used as indicator organisms of pathogenic organisms found in treated wastewater. The presence of coliform organisms is taken as an indication that pathogenic organisms may also be present, and the absence of coliform organisms is taken as an indication that the water is free from disease-producing organisms. The only constituent regulated by the California Water Recycling Criteria (the regulations Minnesota uses for administering permits for water reuse) for industrial water uses is an indicator organism, total coliforms. For uses that are not likely to contact humans, the total coliform limit is 23/100 ml. For uses with potential for human contact, the total coliform limit is 2.2/100 ml. Most WWTPs in Minnesota are permitted to meet a fecal coliform limit of 200. Fecal coliforms are a subset of total coliforms. Figure 29 presents the frequency of occurrence of fecal coliforms in the effluent of all Minnesota WWTPs. Similar information is shown in Figure 30 for WWTPs with design capacities greater than 1 mgd. The variability of effluent fecal coliforms is also characterized for the following ranges: 100/100 mL. The average WWTP effluent fecal coliform concentrations are depicted by location and facility capacity in Figure 31 and further detailed in Figures 32-35. Minnesota facilities produce a high quality effluent in terms of fecal coliforms. There were 170 facilities with fecal coliform counts less than 10/100 mL, accounting for 150 mgd of the WWTP capacity in the state. Nearly 300 facilities with a design capacity totaling 535 mgd have effluent fecal coliform concentrations in the 10-100/100 mL range. Over 40 WWTPs, with a combined capacity of 70 mgd, produce an effluent with a fecal coliform count greater than 100/100 mL.

TM4: WWTP Effluent Quality<br />

<strong>Recycling</strong> <strong>Treated</strong> <strong>Municipal</strong> <strong>Wastewater</strong> <strong>for</strong> <strong>Industrial</strong> <strong>Water</strong> <strong>Use</strong><br />

Figure 27. Effluent Ammonia and Number of <strong>Municipal</strong> WWTPs in Minnesota<br />

>10 mg/L,<br />

6.5 mgd<br />

(0.9%)<br />

5-10 mg/L, 24<br />

mgd (3.1%)<br />

1-5 mg/L,<br />

128.5 mgd<br />

(16.8%)<br />

< 1 mg/L, 64 WWTPs (11.0%)<br />

not measured, 139.6 mgd (18.3%)<br />

1-5 mg/L, 22 WWTPs (3.8%)<br />

5-10 mg/L, 12 WWTPs (2.1%)<br />

>10 mg/L, 4 WWTPs (0.7%)<br />

not me a sure d, 481 W W T Ps<br />

(82.5%)<br />

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