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sewerage water board of new orleans

Sewerage

Anita
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sewerage water board of new orleans

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    1. Sewerage & Water Boardof New Orleans

    2. Who Is The S&WB? New Orleans settled by French in 1718 Drinking water from cisterns or untreated river water No sewerage collection or disposal Disease and fire a serious, recurring problem S&WB Created by Louisiana Legislature in 1899 Board is a quasi-City/State agency Purpose to furnish, construct, operate, and maintain water, drainage, and sewerage systems for New Orleans

    3. Sewerage System Two treatment plants 2,450 miles of pipes, mains, connections (four inches to seven feet in diameter) 83 lift stations Three large pumping stations Treat 142 million gallons per day

    4. Drainage System 24 Major pumping stations; 15 underpass stations Capable of pumping 30 billion gallons per day or 50,268 cfs (creates a flow equivalent to that of Ohio River) Drains 58,785 acres in Orleans Parish; 2,250 in Jefferson Parish 93 miles of covered canals; 82 miles of open canals Operates 25Hz Power Plant

    5. Sewerage & Water Board of New Orleans Water System Two water treatment plants 270 million gallons per day production capacity Distributed to 120,000 service connections and 24,000 fire hydrants 1,790 miles of mains ranging in size from 4 to 54 inches in diameter On-site water quality lab

    6. Carrollton Water Plant Serves East Bank Orleans Parish 230 MGD capacity Source Mississippi River Conventional Treatment 55 ton rail cars 6,000 lbs/day Cl2

    7. Algiers Water Plant Serves West Bank Orleans Parish 40 MGD capacity Source Mississippi River Conventional Treatment Ton cylinders 600 lbs/day Cl2

    8. Driving Forces to Change Vulnerability Assessment (1994) Risk Management Program (1999) Aging Carrollton System Supply Considerations

    9. Carrollton System Evaluation Aging Infrastructure Safety and Security Improvements Needed Supply Availability Concerns 55 ton rail car fleet Willing manufacturers

    10. Carrollton System Evaluation Evaluated Improvements to Existing Rail Car Chlorine System

    11. Considered switch to Hypochlorite Inherently safer system Capital cost less Chemical cost higher DPB considerations Carrollton System Evaluation

    12. Risk Mitigation Wins! Ops & Management evaluated alternatives Operating experiences Costs Capital and Operating Past litigation Security trends Chose risk reduction with hypo

    13. Katrinas Effect Rails washed out no rail cars Installed temp hypo system Used thru Katrina recovery period Complimented rail car system Operating experience with hypo

    14. Sources of Hypo Considered Purchased Commercial grade hypo delivered On-Site Generation Electrochemical generation from salt

    15. Purchased Hypo Several manufacturers in area Delivered by tank truck Less than 1 hr. away Simplicity in operation Capital Cost - least expensive Chemical Cost - most expensive

    16. On-Site Generation Salt readily available in area Several manufacturers of systems Power needs/costs to consider Complexity of operations Capital cost higher Operating costs less than purchased

    17. Furthur Eval of On-Site Generation Low vs. high strength product Complexity of operations Chemical purity concerns System Trial Site Visit Operating experiences of others

    18. Carrollton Direction Commercial Hypo Delivered Bulk storage and pumping facility Can be incorporated into future on-site generation system if desired Design completed

    19. Algiers Direction On-Site Generation / High Strength Hypo Commercial hypo delivery redundancy Evaluate technology for Carrollton Scalable up to Carrolltons needs

    20. Algiers Installation On-Site generation of chlorine 1500 lb/day available Cl2 capacity Membrane cell technology Chlorine can be converted to commercial strength hypo Can accept bulk delivery of hypo if needed

    21. Algiers Installation Costs Equipment Purchase - $700K Installation - $1.2M Installation of new equipment Relocation and demolition of existing facilities Employee training and start up assistance Installation Time Chemical Cost $0.35/lb avail Cl2 as hypo generated $0.53/lb avail Cl2 hypo purchased

    22. Operating Experiences Startup in April 2009 Learning Curve Intimidating to some operators Sensitive to operational hiccups Few bugs to work out yet Overall positive experience so far

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