volume 1 - Halifax Regional Municipality
volume 1 - Halifax Regional Municipality
volume 1 - Halifax Regional Municipality
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<strong>Halifax</strong> Water Integrated Resource Plan<br />
Integrated Resource Plan Drivers and Objectives<br />
BLT, Aerotech, North Preston and Lockview – MacPherson (Fall River) and is in the<br />
process of further upgrading the BLT facility on the basis of effluent limits developed<br />
through an environmental risk assessment (ERA). LOT applied at Aerotech, North<br />
Preston and Lockview WWTFs would further enhance their capabilities for both nitrogen<br />
and phosphorus removal.<br />
For purposes of the IRP, development of a conservative assumption was made that each<br />
facility except BLT, which is already being upgraded, would need to meet limit of<br />
technology (LOT) effluent limits. The term “limit of technology” has been used to<br />
describe the lowest, consistently achievable effluent concentration for total phosphorus<br />
(TP) and total nitrogen (TN) utilizing existing technology. In Chesapeake Bay, a program<br />
has been in place since 1992, which implemented the concept of LOT utilizing biological<br />
nutrient removal (BNR) technologies. 24<br />
The following future effluent requirements are projected based on the concept of LOT,<br />
for TN and TP:<br />
• Monthly TN limit of 5 mg/L as N, based on accepted LOT.<br />
• Monthly TP limit of 0.1 mg/L as P based on the range of proposed LOT and full-scale<br />
plant performance at other WWTFs.<br />
Before embarking on the implementation of LOT it is recommended that ERAs be<br />
carried out for each receiving water to allow a more precise definition of WWTF effluent<br />
requirements. As noted, an ERA has been completed for the BLT WWTF and one is<br />
underway for the Aerotech WWTF.<br />
The current and future compliance requirements needed at each of the <strong>Halifax</strong> Water<br />
wastewater facilities for current NSE PTOs, future WSER requirements and potential<br />
future nutrient requirements are presented in Table 4.3. The current compliance<br />
projects are a combination of projects identified in the Five-Year Capital Plan and<br />
through the analysis of the IRP. The Five-Year Capital Plan projects are presented in<br />
Volume 1 Appendix B while the IRP derived projects are presented in Volume 3<br />
Appendix B in the Wastewater Treatment Facility Review.<br />
24 Chesapeake Bay Foundation, 2004<br />
Revision: 2012-10-29 Integrated Resource Plan 36<br />
October 31 2012 Page 69 of 272
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