volume 1 - Halifax Regional Municipality

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Halifax Water Integrated Resource Plan IRP Planning Context and Levels of Service Table 3.4 Summary of Wastewater Treatment Facilities Facility Name Level of Treatment Rated Capacity (m 3 /d) Receiving Water Body (type) Halifax WWTF Enhanced Primary 133,920 Halifax Harbour (salt water) Dartmouth WWTF Enhanced Primary 83,808 Halifax Harbour (salt water) Herring Cove WWTF Enhanced Primary 28,512 Halifax Harbour (salt water) Lockview / Macpherson (Fall River) WWTF Tertiary 454 Lake Fletcher (fresh water) Middle Musquodoboit WWTF Secondary 114 Musquodoboit River (fresh water) North Preston WWTF Tertiary 680 Whynder Lake (fresh water via wetland) Uplands Park WWTF Tertiary 91 Sandy Lake via a wetland (fresh water) Wellington (Steeves Subdivision) WWTF Secondary (1) Fletcher's Run (fresh water) 45 Frame Subdivision (Waverley) WWTF Secondary 80 Lake William via a ditch (fresh water) New outfall to Lake William Springfield Lake WWTF Secondary 545 Lisle Lake via a brook (fresh water) Mill Cove WWTF Secondary 28,400 Bedford Basin (salt water) Eastern Passage WWTF Secondary (2) 25,000 (2) Halifax Harbour (salt water) Beechville/Lakeside /Timberlea WWTF Secondary 4,540 Nine Mile River (fresh water) Aerotech WWTF Tertiary 1,400 Johnson River (fresh water) Notes: 1. The rated capacity for the Wellington (Steeves Subdivision) WWTF shown is for the proposed Wellington WWTF to replace the existing package extended aeration facility (under construction). 2. Upgrades are currently underway to upgrade the Eastern Passage WWTF to a secondary treatment facility, and increase the rated capacity to 25,000 m 3 /d. Full details of each of the WWTFs are presented in the Wastewater System Review in Volume 3 Appendix B. Biosolids Management In addition to the liquid process treatment plants, Halifax Water also operates a number of biosolids processing facilities. The Halifax Harbour Solutions (HHS) facilities (Halifax, Dartmouth, and Herring Cove) have on-site dewatering facilities for the undigested primary sludge generated by the liquid treatment train. The Aerotech WWTF provides centralized dewatering for undigested sludge and anaerobically digested biosolids from the other Halifax Water WWTFs: liquid, anaerobically digested sludge is hauled to Aerotech WWTF from the Mill Cove, Eastern Passage, and Revision: 2012-10-29 Integrated Resource Plan 21 October 31 2012 Page 54 of 272
Halifax Water Integrated Resource Plan IRP Planning Context and Levels of Service Beechville/Lakeside/Timberlea (BLT) WWTFs; liquid, undigested sludge is hauled to Aerotech WWTF from the remaining facilities. All sludge cake produced, either at the HHS facilities or Aerotech WWTF, is trucked to the biosolids processing facility (BPF), located in the Aerotech Business Park, for alkaline stabilization. In the past, the return of a recycle stream from the BPF had a negative influence on the effluent quality discharged from the Aerotech WWTF. A pre-treatment facility at the BPF has addressed this issue. The Aerotech WWTF still receives hauled waste, which can upset plant processes and result in adverse effluent quality. Halifax Water is presently reviewing its hauled waste management with a view to resolving this issue. Regional Wastewater Functional Plan Halifax Water recently completed the Regional Wastewater Functional Plan (RWWFP) 18 . The RWWFP presents a regionalized wastewater strategy that consolidates a number of the smaller WWTFs now discharging into limited freshwater receivers and diverts them to WWTFs discharging to more robust saltwater environments. The RWWFP addresses the residential and employment growth that is presented in Section 4 under the growth driver as well as the requirement to offset the increase in wet weather overflows that results from future growth. This is also addressed in Section 4 under future wastewater regulatory compliance. The growth planning period for the RWWFP extends to 2046. This is somewhat beyond the 2043 end of planning period used in the IRP. As it emerged, all the RWWFP project expenditures are complete by the 2043 date. The RWWFP recommended plan includes expansion of the Dartmouth, Herring Cove and Aerotech WWTFs as well as a number storage and pumping facilities and trunk sewer upgrades and expansions. Reference should be made to the RWWFP for plan details. The preferred servicing solutions recommended by the RWWFP are briefly summarized as follows: Central Region • Includes: Mill Cove, Springfield Lake, Fall River, Frame subdivision, Middle Musquodoboit, Uplands Park, Wellington and Aerotech. • In total, planned growth is 17, 800 persons of residential growth plus related employment growth. Employment only, no residential growth for Aerotech. • Only Mill Cove, Aerotech and Springfield Lake have planned serviced growth over the RWWFP time horizon and are therefore the focus of the servicing strategy for the central region. 18 Regional Wastewater Functional Plan, Halifax Water, June 2012 Revision: 2012-10-29 Integrated Resource Plan 22 October 31 2012 Page 55 of 272
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Statement Concerning Halifax Water
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Statement Concerning Halifax Water
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volume 1 - Halifax Regional Municipality

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