FINAL REPORT - Grand River Conservation Authority

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Grand River Watershed-Wide Wastewater Optimization Pilot Project RESULTS Data Collection Information on performance and process loading was obtained for 15 WWTPs for the 12-month period from August 2009 to July 2010. As one of the plants (the Woodward Ave WWTP in Hamilton) was outside of the Grand River watershed, results for 14 watershed WWTPs were compiled in an overall Excel database. Participating WWTPs were identified by letter (instead of name) to respect confidentiality of the facilities participating. A discussion of the results is presented below. C of A Limits and Historical Performance Figures 5 and 6 are graphs of effluent quality and C of A limits for total phosphorus and total ammonia nitrogen for watershed WWTPs. Total phosphorus and total ammonia were judged to be the most significant parameters in terms of impact on the effluent quality of the Grand River. The blue bars are the annual average effluent concentrations for TP (Figure 5) and total ammonia (Figure 6). The horizontal lines above the graphs are the C of A compliance limits for each WWTP. It should be noted that in many cases the C of A compliance limit for total ammonia changes seasonally with higher levels typically permitted during cold weather months. The graph in Figure 6 shows only the most restrictive compliance limit. Several WWTPs do not have a compliance limit for total ammonia in their C of A. 27 | Page
Grand River Watershed-Wide Wastewater Optimization Pilot Project Figure 5: Effluent TP relative to C of A Criteria Effluent TP C of A Criteria 1.20 1.00 0.80 TP (mg/L) 0.60 0.40 0.20 0.00 A B C D E F G H I J K L M N Figure 6: Effluent NH3 relative to C of A Criteria Effluent NH3 C of A Criteria 22.2 mg/L 10.0 9.0 8.0 7.0 NH3 (mg/L) 6.0 5.0 4.0 3.0 2.0 1.0 0.0 A B C D E F G H I J K L M N 28 | Page
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FINAL REPORT - Grand River Conservation Authority

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