CENTRALIZED TREATMENT OPTIONS AND CHALLENGES
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1 CENTRALIZED TREATMENT OPTIONS AND CHALLENGES Mike Richardson, Water Resources Manager Ben Kearns, Surface Water Operations Supervisor THE CAPE FEAR PUBLIC UTILITY AUTHORITY Established July 1, 2008 Self supporting agency Merged water/wastewater utilities of New Hanover County and the City of Wilmington Approximately 68,000 accounts serving over 200,000 customers 1
2 CFPUA manages four separate water systems: City of Wilmington, NC Centralized drinking water since the 1900s. New Hanover County, NC Fragmented well systems until Nanofiltration Plant in 2009 PWS # Sweeney Water Treatment Plant PWS # Nano Filtration Plant PWS # Monterey Heights PWS # US 421 System WATER SOURCES Surface Water Source: Cape Fear River Ground Water Source: Pee Dee & Castle Hayne Aquifers 2
3 CFPUA SWEENEY WATER TREATMENT PLANT Sweeney WTP Advanced Treatment Process Ozonation Enhanced Coagulation (SuperPulsator Clarifiers) Biological Filtration UV Disinfection Finished Water Aeration (Project Completion Summer 2016) Elevated Storage Tank Aeration (Completion Spring 2016) 3
4 SWEENEY UPGRADE 2012 SWEENEY: IMPROVEMENTS TO DRINKING WATER Overall Water Quality Improvements Ozonation Enhanced Coagulation (SuperPulsator Clarifiers) Biological Filtration UV Disinfection Finished Water Aeration (Project Completion Summer 2016) Elevated Storage Tank Aeration (Completion Spring 2016) Designed for 21 st Century Challenges Trihalomethanes (THM) UCMR-3, 4, 5 Haloacetic Acids (HAA) EDCs / PCPs Algae / Algal Toxins Perfluorinated Compounds 4
5 SWEENEY: PROCESS CHALLENGES Source Water Quality Not in complete control run of the river Highly variable Capital / Maintenance Costs Plant upgrades System / instrumentation maintenance Security Concerns SCADA security & cyber security Plant site, critical process & chemicals Future regulated contaminants Advanced treatment strategies necessary Plant monitoring / lab testing costs Increased focus on distribution system attenuation & monitoring CFPUA NANOFILTRATION COMPLEX 5
6 Advanced Membrane Technology Nano-filtration membrane 25 Groundwater Wells Source Aquifers Castle Hayne Pee Dee 6.0 MGD Capacity Two 1.0 MG Clearwells 6
7 NANO: IMPROVEMENTS TO DRINKING WATER Overall Water Quality Improvements Reduction in hardness discontinue use of home softeners for customers Organics and Inorganics removal Removal of small amount of chlorides (upgrade to RO possible) Reduction in iron & manganese and the occurrence of discolored water Improved taste & odor Addition of blended polyphosphate for corrosion control to prohibit plumbing corrosion Future System Integration: Emergency support for overall system Source of high quality blend water NANO: PROCESS CHALLENGES Quality/quantity source water Discharge limitations/regulations Higher production cost of same quality Well site security 7
8 Sweeney Water Treatment Plant Nano Filtration Treatment Plant Monterey Heights/ Veteran s Park Hwy. 421/ Flemington 35 MGD Surface Water: Cape Fear River 6 MGD Groundwater: Castle Hayne/ Pee Dee Aquifers Groundwater: Castle Hayne and surficial aquifers Groundwater: Castle Hayne Aquifer 16.5 MGD daily average 7,672 Fire Hydrants 14,867 Valves 1,100+ miles of water line 54 Well Sites 11 Elevated Storage Tanks (8.5 MG) 4 Reservoirs (18 MG) 2 Water Treatment Plants 4 Water Systems Aquifer Storage Recovery/ASR (2 MG) 8
9 OPERATING FOUR SYSTEMS IS PROBLEMATIC: No connectivity for demand leveling/event management Lack of consistent water quality Increased Costs Operations Compliance challenges Administrative Capital Costs Rate Increases WATER SUPPLY INTEGRATION Emergency Interconnections Partial System Integration Completed or currently under construction Complete System Integration System Interconnects Phase 1 Phase 2 Phase 3 9
10 System and plant expansions and upgrades are important to, centralized treatment, regional growth and to CFPUA s commitment to stewardship, sustainability, and service. 10
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