Recycling Treated Municipal Wastewater for Industrial Water Use
Recycling Treated Municipal Wastewater for Industrial Water Use Recycling Treated Municipal Wastewater for Industrial Water Use
TM2: Sampling Plan and Results Recycling Treated Municipal Wastewater for Industrial Water Use Samples were collected at four Council WWTPs: Blue Lake Empire Metropolitan Seneca 3.0 Sampling Results The sampling program developed for this project provided an initial base of information that was used for various tasks in the project, including: general characterizations of effluent water quality for Minnesota WWTPs plant-specific information to compare the effluent quality of the Council’s four largest WWTPs This technical memorandum serves to document the data and provide summary information on the effluent quality of the four Council WWTPs evaluated. 3.1 General Summary The constituents analyzed in this project’s sampling program, indicate that hardness and salt concentrations occur at concentration thresholds of concern for a range of industrial water uses. Similar to the results of Technical Memorandum 5, Wastewater Treatment Plant Effluent Quality, which reviewed general water quality parameters for all of Minnesota’s WWTPs, the NPDES permitted constituents for the four WWTPs were well below required limits and had low variability in the samples measured. Table 4 provides the mean and standard deviation of the samples collected for the Fall 2006 and Spring 2007 sampling periods. The recommended limits for each constituent as it relates to cooling water uses, is provided in the third column. Exhibit A provides additional statistics for this table, such as minimum and maximum values, and the number of samples the statistics are based upon. It also contains recommended limits for various industrial water uses in a format similar to Table 4. Exhibits B-D provide data for each WWTP. The Fall 2006 sampling data were evaluated with time series plots to look for any outliers and see if any trends existed. Given that this is a small data set (8-28 samples), this effort was used more to screen and identify any gross trends. Additional data will need to be reviewed over a longer period of time to define any trends. 6 Craddock Consulting Engineers In Association with CDM & James Crook TM2-Sampling_0707.doc
Table 4. Wastewater Recycling Sampling Program Summary Results 1 Constituent Unit Limit 2 Alkalinity (as CaCO3) mg/L 20-350 Mean St Dev 3 Mean St Dev Mean St Dev Mean St Dev 293 10 246 20 157 15 184 14 Aluminum (Al) mg/L 0.1 0.022 0.008 0.023 0.006 0.030 0.004 0.024 0.002 Ammonia (NH3) mg/L 24 0.182 0.068 0.2 0.3 0.216 0.34 0.117 0.110 Bicarbonate (HCO 3) mg/L as CaCO 3 25-200 300 8 256 31 157 20 182 6 Calcium (Ca) mg/L 50 93.2 3.8 82.2 4.5 72.2 4.4 62.9 5.3 Carbonaceous Biochemical Oxygen Demand (CBOD) mg/L
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Table 4. <strong>Wastewater</strong> <strong>Recycling</strong> Sampling Program Summary Results 1<br />
Constituent Unit Limit 2<br />
Alkalinity (as CaCO3) mg/L 20-350<br />
Mean St Dev 3<br />
Mean St Dev Mean St Dev Mean St Dev<br />
293 10 246 20 157 15 184 14<br />
Aluminum (Al) mg/L 0.1 0.022 0.008 0.023 0.006 0.030 0.004 0.024 0.002<br />
Ammonia (NH3) mg/L 24 0.182 0.068 0.2 0.3 0.216 0.34 0.117 0.110<br />
Bicarbonate (HCO 3)<br />
mg/L as<br />
CaCO 3<br />
25-200<br />
300 8 256 31 157 20 182 6<br />
Calcium (Ca) mg/L 50 93.2 3.8 82.2 4.5 72.2 4.4 62.9 5.3<br />
Carbonaceous Biochemical<br />
Oxygen Demand (CBOD) mg/L
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